Powder Metallurgy最新文献

英文中文

Influence of different binder metals in high entropy carbide based hardmetals 不同粘结剂对高熵碳化物基硬质合金的影响

IF 1.4 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Powder Metallurgy

Pub Date : 2022-05-21 DOI: 10.1080/00325899.2022.2076311

J. Pötschke, A. Vornberger, T. Gestrich, L. Berger, A. Michaelis

ABSTRACT High-entropy carbides (HEC) are a class of promising new hard phases for a sustainable improvement of hardmetal properties. In this work, hardmetals of the HEC (Ta,Nb,Ti,V,W)C were studied with two typical binder volume fractions of 16 and 24 vol-% consisting of Co, Ni and FeNi. The sintering behaviour, microstructure, phase composition, magnetic and mechanical properties are discussed and are compared to a conventional WC-Co hardmetal. It was shown that the HEC has a high-phase stability and that dense hardmetals with promising mechanical properties were obtained.

摘要高熵碳化物（HEC）是一类有前途的新型硬质相，可用于可持续改善硬质合金的性能。在这项工作中，研究了HEC（Ta，Nb，Ti，V，W）C的硬质合金，其两种典型的粘结剂体积分数分别为16和24 由Co、Ni和FeNi组成的体积百分比。讨论了WC-Co硬质合金的烧结行为、微观结构、相组成、磁性和机械性能，并与传统WC-Co硬金属进行了比较。结果表明，HEC具有较高的相稳定性，并获得了具有良好力学性能的致密硬质合金。

引用次数: 8

Induction of p27 contributes to inhibitory effect of isorhapontigenin (ISO) on malignant transformation of human urothelial cells. p27 的诱导有助于抑制异黄酮甙元（ISO）对人尿道细胞恶性转化的影响。

IF 4.3 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Powder Metallurgy

Pub Date : 2022-05-15 DOI: 10.1080/15384101.2022.2074623

Maowen Huang, Xiaohui Hua, Jiheng Xu, Zhongxian Tian, Jiajing Wang, Hengchao Chen, Xuyao Wang, Peng Shu, Hongyan Ye, Jianfeng Shu, Chuanshu Huang

Bladder cancer (BC) is the most expensive cancer to manage on a per-patient basis, costing about $4 billion in total healthcare expenditure per annum in America alone. Therefore, identifying a natural compound for prevention of BC is of tremendous importance for managing this disease. Previous studies have identified isorhapontigenin (ISO) as having an 85% preventive effect against invasive BC formation induced by N-butyl-N-(4-hydroxybutyl) nitrosamine (BBN). The results showed here that ISO treatment inhibited EGF-induced cell transformation of human urothelial cells through induction of tumor suppressor p27 transcription secondary to activation of an E2F1-dependentpathway.ISOtreatmentrenderedcellsresistanttoEGF-induced anchorage-independent growth concurrent with p27 protein induction in both UROtsa and SV-HUC-1 cells. ISO inhibition of EGF-induced cell transformation could be completely reversed by knockdown of p27, indicating that this protein was essential for the noted ISO inhibitory action. Mechanistic studies revealed that ISO treatment resulted in increased expression of E2F1, which in turn bound to its binding site in p27 promoter and initiated p27 transcription. The E2F1 induction was due to the elevation of its translation caused by ISO-induced miR-205 downregulation. Consistently, miR-205 was found to be overexpressed in human BCs, and ectopic expression of miR-205 mitigated ISO inhibitory effects against EGF-induced outcomes. Collectively, the results here demonstrate that ISO exhibits its preventive effect on EGF-induced human urothelial cell transformation by induction of p27 through a miR-205/E2F1 axis. This is distinct from what has been described for the therapeutic effects of ISO on human BC cells.

膀胱癌（BC）是治疗费用最昂贵的癌症，仅在美国，每年的医疗总支出就高达 40 亿美元。因此，找到一种能预防膀胱癌的天然化合物对控制这种疾病极为重要。先前的研究发现，异芹菜素（ISO）对N-丁基-N-（4-羟基丁基）亚硝胺（BBN）诱导的侵袭性 BC 的形成有 85% 的预防作用。结果表明，ISO处理通过诱导肿瘤抑制因子p27转录，继而激活E2F1依赖途径，抑制了EGF诱导的人尿路上皮细胞的细胞转化。通过敲除 p27，ISO 对 EGF 诱导的细胞转化的抑制作用可被完全逆转，这表明该蛋白对 ISO 的抑制作用至关重要。机理研究发现，ISO 处理会导致 E2F1 的表达增加，而 E2F1 又会与其在 p27 启动子中的结合位点结合并启动 p27 的转录。E2F1 的诱导是由于 ISO 诱导的 miR-205 下调导致其翻译量增加。与此相一致，研究发现 miR-205 在人类 BCs 中过度表达，而 miR-205 的异位表达减轻了 ISO 对 EGF 诱导结果的抑制作用。总之，本文的研究结果表明，ISO 通过 miR-205/E2F1 轴诱导 p27，从而对 EGF 诱导的人类尿路上皮细胞转化产生预防作用。这与 ISO 对人类 BC 细胞的治疗效果不同。

{"title":"Induction of p27 contributes to inhibitory effect of isorhapontigenin (ISO) on malignant transformation of human urothelial cells.","authors":"Maowen Huang, Xiaohui Hua, Jiheng Xu, Zhongxian Tian, Jiajing Wang, Hengchao Chen, Xuyao Wang, Peng Shu, Hongyan Ye, Jianfeng Shu, Chuanshu Huang","doi":"10.1080/15384101.2022.2074623","DOIUrl":"10.1080/15384101.2022.2074623","url":null,"abstract":"<p><p>Bladder cancer (BC) is the most expensive cancer to manage on a per-patient basis, costing about $4 billion in total healthcare expenditure per annum in America alone. Therefore, identifying a natural compound for prevention of BC is of tremendous importance for managing this disease. Previous studies have identified isorhapontigenin (ISO) as having an 85% preventive effect against invasive BC formation induced by N-butyl-N-(4-hydroxybutyl) nitrosamine (BBN). The results showed here that ISO treatment inhibited EGF-induced cell transformation of human urothelial cells through induction of tumor suppressor p27 transcription secondary to activation of an E2F1-dependentpathway.ISOtreatmentrenderedcellsresistanttoEGF-induced anchorage-independent growth concurrent with p27 protein induction in both UROtsa and SV-HUC-1 cells. ISO inhibition of EGF-induced cell transformation could be completely reversed by knockdown of p27, indicating that this protein was essential for the noted ISO inhibitory action. Mechanistic studies revealed that ISO treatment resulted in increased expression of E2F1, which in turn bound to its binding site in p27 promoter and initiated p27 transcription. The E2F1 induction was due to the elevation of its translation caused by ISO-induced miR-205 downregulation. Consistently, miR-205 was found to be overexpressed in human BCs, and ectopic expression of miR-205 mitigated ISO inhibitory effects against EGF-induced outcomes. Collectively, the results here demonstrate that ISO exhibits its preventive effect on EGF-induced human urothelial cell transformation by induction of p27 through a miR-205/E2F1 axis. This is distinct from what has been described for the therapeutic effects of ISO on human BC cells.</p>","PeriodicalId":20392,"journal":{"name":"Powder Metallurgy","volume":"25 1","pages":"1-14"},"PeriodicalIF":4.3,"publicationDate":"2022-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87675996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparation and characterisation of nickel-based brazing powder: cobalt and chromium addition effects 镍基钎焊粉末的制备和表征：钴和铬的添加效应

IF 1.4 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Powder Metallurgy

Pub Date : 2022-05-12 DOI: 10.1080/00325899.2022.2073013

E. Hosseini, M. Amirjan, N. Parvin

ABSTRACT In the present work, three novel brazing powders were produced, in addition to a commercial composition, by the mechanical alloying (MA) method. Cobalt and chromium’s effects on the properties of brazing powder and related joints were investigated. The results showed that; with the addition of cobalt, the powder morphology went to a rounded and near-spherical shape after 15 milling hours, and the solidus significantly raised. Also, chromium shifted the melting range to higher temperatures. The powder with 6% cobalt and 14% chromium had more than 100°C higher solidus and a melting range of 20°C than the commercial BNi-2, ideal for working temperature of more than 1000°C. The shear strength results revealed that the addition of chromium and cobalt significantly promotes joint strength owing to the activation of the solid solution strengthening mechanism. Therefore, the novel synthesized brazing powders can be an excellent candidate for high temperature and corrosive operating environments.

在本工作中，采用机械合金化(MA)方法制备了三种新型钎焊粉。研究了钴、铬对钎焊粉及相关接头性能的影响。结果表明:;随着钴的加入，粉末形貌在铣削15 h后趋于圆润和接近球形，固相度显著提高。此外，铬将熔化范围转移到更高的温度。含有6%钴和14%铬的粉末比商用BNi-2的固相度高100°C以上，熔化范围为20°C，理想的工作温度超过1000°C。抗剪强度结果表明，铬和钴的加入激活了固溶强化机制，显著提高了接头强度。因此，新型合成的钎焊粉可以作为高温和腐蚀性工作环境的优良候选者。

引用次数: 1

Microstructure control of Additively manufactured IN718 By L-PBF process L-PBF法添加IN718的微观结构控制

IF 1.4 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Powder Metallurgy

Pub Date : 2022-05-11 DOI: 10.1080/00325899.2022.2069540

L. Lacoste, A. Sakly, S. Dépinoy, S. Lebel, B. Vayre, C. Colin

ABSTRACT Additively manufactured (AM) parts generally exhibit large columnar grains and a preferential crystallographic texture. While this microstructure may have beneficial effects, for instance on creep properties, the resulting mechanical anisotropy remains a key issue for most critical in-service applications. The relationship between the solidification conditions and the melt pool morphology of the Inconel 718 fabricated by laser powder bed fusion (L-PBF) was investigated to adapt the microstructural characteristics of the parts to their intended applications. By optimising the length of the scanned vectors, it is possible to reduce both the texture index and the grain size by a factor 2 based on EBSD analyses. In addition, the aspect ratio and the grain density can be increased by a factor 1.1 and 2.2, respectively, compared to a conventional L-PBF scanning strategy. These achievements pave the way for the production of fully isotropic parts and/or anisotropic parts controlled by the L-PBF process.

添加制造（AM）零件通常表现出大的柱状晶粒和优先的结晶织构。虽然这种微观结构可能具有有益的影响，例如对蠕变性能，但由此产生的机械各向异性仍然是大多数关键在役应用的关键问题。研究了通过激光粉末床熔融（L-PBF）制备的Inconel 718的凝固条件与熔池形态之间的关系，以使零件的微观结构特征适应其预期应用。通过优化扫描矢量的长度，可以根据EBSD分析将纹理指数和晶粒度都降低2倍。此外，与传统的L-PBF扫描策略相比，纵横比和晶粒密度可以分别增加1.1和2.2倍。这些成就为生产完全各向同性零件和/或由L-PBF工艺控制的各向异性零件铺平了道路。

引用次数: 2

Influence of defects on damage tolerance of Metal-Injection-Molded β titanium alloys under static and dynamic loading 缺陷对金属注射成型β钛合金静态和动态损伤容限的影响

IF 1.4 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Powder Metallurgy

Pub Date : 2022-05-06 DOI: 10.1080/00325899.2022.2069077

P. Xu, T. Ebel, F. Pyczak, R. Willumeit-Römer, Sen Yu

ABSTRACT The β titanium alloys are key materials in lightweight and biomedical applications, due to the combination of excellent biocompatibility and mechanical properties. However, the Binder-based Powder Technologies such as Metal-Injection-Molding (MIM), Binder-Jetting and Fused-Filament-Fabrication, normally introduce three major processing-related defects in the as-sintered Ti-parts: (i) residual porosity, (ii) high impurity level and (iii) coarse-grained structure. The previous studies revealed that these processing defects invariably tend to be even more severe in β titanium alloys than in α/β Ti-6Al-4V alloy, all fabricated by powder metallurgical route. In this work, these processing defects and their likely origins in MIM β titanium alloys are analysed. Furthermore, the influence of these defects on damage tolerance and fracture mechanisms of MIM β titanium alloys under either static or dynamic loading is investigated. Based on the studies, strategic technical improvements in the processing to improve the reliability of MIM β titanium alloys products are proposed.

摘要β钛合金具有良好的生物相容性和力学性能，是轻量化和生物医学应用的关键材料。然而，基于粘结剂的粉末技术，如金属注射成型（MIM）、粘结剂喷射和熔丝制造，通常会在烧结后的Ti零件中引入三个主要的加工相关缺陷：（i）残余孔隙率，（ii）高杂质水平和（iii）粗粒结构。先前的研究表明，这些加工缺陷在β钛合金中总是比在α/βTi-6Al-4V合金中更严重，所有这些都是通过粉末冶金方法制造的。本文分析了MIMβ钛合金中的这些加工缺陷及其可能的来源。此外，还研究了这些缺陷对MIMβ钛合金在静态或动态载荷下的损伤容限和断裂机制的影响。在此基础上，提出了提高MIMβ钛合金产品可靠性的工艺技术改进策略。

{"title":"Influence of defects on damage tolerance of Metal-Injection-Molded β titanium alloys under static and dynamic loading","authors":"P. Xu, T. Ebel, F. Pyczak, R. Willumeit-Römer, Sen Yu","doi":"10.1080/00325899.2022.2069077","DOIUrl":"https://doi.org/10.1080/00325899.2022.2069077","url":null,"abstract":"ABSTRACT The β titanium alloys are key materials in lightweight and biomedical applications, due to the combination of excellent biocompatibility and mechanical properties. However, the Binder-based Powder Technologies such as Metal-Injection-Molding (MIM), Binder-Jetting and Fused-Filament-Fabrication, normally introduce three major processing-related defects in the as-sintered Ti-parts: (i) residual porosity, (ii) high impurity level and (iii) coarse-grained structure. The previous studies revealed that these processing defects invariably tend to be even more severe in β titanium alloys than in α/β Ti-6Al-4V alloy, all fabricated by powder metallurgical route. In this work, these processing defects and their likely origins in MIM β titanium alloys are analysed. Furthermore, the influence of these defects on damage tolerance and fracture mechanisms of MIM β titanium alloys under either static or dynamic loading is investigated. Based on the studies, strategic technical improvements in the processing to improve the reliability of MIM β titanium alloys products are proposed.","PeriodicalId":20392,"journal":{"name":"Powder Metallurgy","volume":"65 1","pages":"354 - 364"},"PeriodicalIF":1.4,"publicationDate":"2022-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47683440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Friction and wear of cobalt–chromium–nickel–copper alloy in contact with tungsten-carbide-sintered balls 钴铬镍铜合金与碳化钨烧结球接触时的摩擦磨损

IF 1.4 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Powder Metallurgy

Pub Date : 2022-05-04 DOI: 10.1080/00325899.2022.2071194

Binghua Wu, Jie Wei, Jin-rong Wu, Mao-li Wang

ABSTRACT This paper describes a study of the influence of elemental nickel (Ni) and copper (Cu) elements on the tribological behaviour of a CoCr-based alloy. The tribology of CoCr-based alloys was examined by using a Bruker UMT-TriboLab machine with normal loads of 200 N, a frequency of 3 Hz, and a duration of 10 min. The Co70Cr20Ni5Cu5 alloy with 5wt-% Ni and 5wt-% Cu content showed the best wear property compared with other alloys, with a minimum friction coefficient of 0.147. The large improvement in wear resistance is related to the strongly inhibiting effect of crack initiation and growth in the worn surface, which reduces delamination wear. Because of the Co0.52Cu0.48 plastic deformation layer, hard phases like NiCoCr and CrCo can slip easily on the sliding interface and embed into the matrix, which may decrease delamination wear and reduce the crack growth rate.

本文研究了元素镍（Ni）和铜（Cu）对CoCr基合金摩擦学性能的影响。CoCr基合金的摩擦学是通过使用Bruker UMT TriboLab机器在200 N的正常负载下，频率为3 Hz，持续时间为10 与其他合金相比，Ni含量为5wt%、Cu含量为5wt-%的Co70Cr20Ni5Cu5合金表现出最佳的磨损性能，最小摩擦系数为0.147。耐磨性的大幅提高与磨损表面裂纹萌生和生长的强烈抑制作用有关，这减少了分层磨损。由于Co0.52Cu0.48塑性变形层的存在，像NiCoCr和CrCo这样的硬相可以很容易地在滑动界面上滑动并嵌入基体中，这可以减少分层磨损并降低裂纹扩展速率。

引用次数: 0

Characterisation of the mechanisms taking place during liquid phase sintering of PM boron steels with the help of artificial intelligence 利用人工智能技术表征PM硼钢液相烧结过程的机理

IF 1.4 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Powder Metallurgy

Pub Date : 2022-03-25 DOI: 10.1080/00325899.2022.2055888

Simon Gélinas, C. Blais

ABSTRACT Liquid phase sintering (LPS) of powder metallurgy (PM) components is a well-recognised strategy to enhance the densification of pressed-and-sintered compacts. This work reports the investigation on the liquid phase formation when a Fe–Ni–Mn–C–B master alloy (MA) is used as a boron carrier in combination with two iron base powders pre-alloyed with Mo. Through differential scanning calorimetry tests, quantitation of the microstructure with the help of artificial intelligence, as well as measurement of sintered density and strength as a function of sintering temperature, it was possible to unravel the mechanisms that take place before and during LPS. It was confirmed that a cascade of events takes place in the solid state prior to reaching the temperature necessary for a eutectic reaction to form a liquid. Additionally, the pre-alloyed Mo content was identified as a factor that modifies the initiation of LPS but not the LPS mechanisms per se.

粉末冶金(PM)部件的液相烧结(LPS)是一种公认的策略，以提高致密的压制和烧结的压坯。本研究报告了Fe-Ni-Mn-C-B主合金(MA)作为硼载体与两种预先与Mo合金的铁基粉末结合使用时液相形成的研究。通过差示扫描量热法测试，人工智能辅助下的微观结构定量，以及烧结密度和强度作为烧结温度函数的测量，有可能揭示LPS之前和过程中发生的机制。结果证实，在达到共晶反应形成液体所需的温度之前，在固态中发生了一系列事件。此外，预合金Mo含量被确定为改变LPS启动的一个因素，而不是LPS机制本身。

引用次数: 1

Novel testing device and routine to characterise the spreadability of powders for powder bed fusion processes – a problem-oriented approach 表征粉末床熔融过程中粉末铺展性的新型测试设备和程序——一种面向问题的方法

IF 1.4 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Powder Metallurgy

Pub Date : 2022-02-23 DOI: 10.1080/00325899.2021.2023414

Marco Mitterlehner, H. Danninger, C. Gierl-Mayer, J. Frank, W. Tomischko, Harald Gschiel

ABSTRACT Currently there is considerable interest in understanding and quantifying the powder characteristics that affect the quality of the top spread powder layer for processes such as powder bed fusion and binder jetting. For this purpose, a new testing device has been developed in order to assess several aspects of this top spread powder layer. Using different measurement procedures, the roughness of the top layer, the surface coverage of a single spread powder layer and the powder bed density of an entire spreading experiment can be determined. Since the tester is freely programmable, the individual process steps of spreading a single powder layer can also be varied. Using these methods, the influence of different process parameters such as e.g. the spreading velocity or the distance between the blade and the building platform, which is also referred to as gap size in general, on the quality of the top or only a single spread layer and on the powder bed packing density can be examined. This study presents the new test device as well as the corresponding measurement procedures mentioned, the reproducibility of the results, which, depending on the measurement method and the measured parameter, range between 0.24 and 4.81%, and the influence of the spreading strategy, which defines the chronological order of the single steps during spreading.

摘要目前，人们对理解和量化影响粉末床熔融和粘结剂喷射等工艺的顶部粉末层质量的粉末特性非常感兴趣。为此，开发了一种新的测试装置，以评估这种顶部喷涂粉末层的几个方面。使用不同的测量程序，可以确定顶层的粗糙度、单个喷涂粉末层的表面覆盖率以及整个喷涂实验的粉末床密度。由于测试仪是可自由编程的，因此也可以改变单个粉末层的各个工艺步骤。使用这些方法，可以检查不同工艺参数的影响，例如铺展速度或叶片与构建平台之间的距离，通常也称为间隙尺寸，对顶部或仅单个铺展层的质量以及对粉末床填料密度的影响。本研究介绍了新的测试装置以及所提到的相应测量程序、结果的再现性，根据测量方法和测量参数，其范围在0.24%至4.81%之间，以及铺展策略的影响，该策略定义了铺展过程中单个步骤的时间顺序。

{"title":"Novel testing device and routine to characterise the spreadability of powders for powder bed fusion processes – a problem-oriented approach","authors":"Marco Mitterlehner, H. Danninger, C. Gierl-Mayer, J. Frank, W. Tomischko, Harald Gschiel","doi":"10.1080/00325899.2021.2023414","DOIUrl":"https://doi.org/10.1080/00325899.2021.2023414","url":null,"abstract":"ABSTRACT Currently there is considerable interest in understanding and quantifying the powder characteristics that affect the quality of the top spread powder layer for processes such as powder bed fusion and binder jetting. For this purpose, a new testing device has been developed in order to assess several aspects of this top spread powder layer. Using different measurement procedures, the roughness of the top layer, the surface coverage of a single spread powder layer and the powder bed density of an entire spreading experiment can be determined. Since the tester is freely programmable, the individual process steps of spreading a single powder layer can also be varied. Using these methods, the influence of different process parameters such as e.g. the spreading velocity or the distance between the blade and the building platform, which is also referred to as gap size in general, on the quality of the top or only a single spread layer and on the powder bed packing density can be examined. This study presents the new test device as well as the corresponding measurement procedures mentioned, the reproducibility of the results, which, depending on the measurement method and the measured parameter, range between 0.24 and 4.81%, and the influence of the spreading strategy, which defines the chronological order of the single steps during spreading.","PeriodicalId":20392,"journal":{"name":"Powder Metallurgy","volume":"65 1","pages":"318 - 334"},"PeriodicalIF":1.4,"publicationDate":"2022-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42601200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

On as-built microstructure and necessity of solution treatment in additively manufactured Inconel 939 增材制造Inconel 939的原位组织及固溶处理的必要性

IF 1.4 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Powder Metallurgy

Pub Date : 2022-02-21 DOI: 10.1080/00325899.2022.2041787

A. S. Shaikh, M. Rashidi, Kevin Minet-Lallemand, E. Hryha

ABSTRACT Increased adoption of additively manufactured superalloys has led to the consideration of revised heat treatment approaches for these materials. The rapid cooling during additive manufacturing processes has been seen to suppress gamma prime (γ′) precipitation, which has raised the possibilities for omitting the high-temperature solution treatment step that usually precedes ageing heat treatment for these alloys. In this work, the as-built microstructure of a high gamma prime fraction superalloy Inconel 939 is presented, where the absence of any γ′ precipitation is notable. However, transmission electron microscopy shows the presence of nano-sized Eta (η) phase. It is shown that the omission of solution treatment leads to the growth of the deleterious η phase upon ageing, which results in embrittlement in tensile loading. It is concluded that at least for this particular alloy the solution treatment plays a critical role in the establishment of the required microstructure and hence cannot be omitted from the heat treatment.

随着增材制造高温合金的日益普及，人们开始考虑对这些材料的热处理方法进行修订。在增材制造过程中，快速冷却被认为可以抑制γ素数(γ′)的析出，这就有可能省去这些合金在时效热处理之前通常要进行的高温固溶处理步骤。在这项工作中，提出了高γ素数高温合金Inconel 939的初步组织，其中没有任何γ′沉淀是值得注意的。然而，透射电镜显示纳米尺寸的Eta (η)相的存在。结果表明，不进行固溶处理会导致有害η相在时效过程中生长，从而导致拉伸载荷脆性。结论是，至少对于这种特殊的合金，固溶处理在建立所需的显微组织方面起着关键作用，因此不能从热处理中忽略。

引用次数: 8

Particle deformation and microstructural evolution of high borated stainless steel consolidated by Gleeble-simulated direct powder forging Gleeble模拟粉末直接锻造强化高硼不锈钢的颗粒变形和组织演变

IF 1.4 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Powder Metallurgy

Pub Date : 2022-02-17 DOI: 10.1080/00325899.2022.2040699

Xuan Zhou, Mingjia Wang

ABSTRACT In the present work, a novel method was first proposed to realise direct powder forging of high borated stainless steel on Gleeble through hot compression tests performed at 1150°C and 0.01–10 s−1 with strains of 32% and 50%. Particle deformation and microstructural evolution of high borated stainless steel powder during direct forging were investigated. Backscattered electron (BSE) and electron backscatter diffraction (EBSD) were employed for microstructure examination. Microstructure reveals that large deformation zones were easily distinguished by boride and grain features. Enhanced boride coarsening in the contact area of powders was attributed to the combined action of strain, dislocation, stress and temperature rising. Strain rates had no obvious influence on densification but significantly affected the deformation of particles. Furthermore, the mechanism of particle deformation enhanced by a higher strain rate was discussed.

在本工作中，首次提出了一种新方法，通过在1150°C和0.01-10 s−1下进行应变为32%和50%的热压缩试验，在Gleeble上实现高硼化不锈钢的直接粉末锻造。研究了高硼化不锈钢粉末在直接锻造过程中的颗粒变形和显微组织演变。采用背散射电子(BSE)和电子背散射衍射(EBSD)进行微观结构检测。显微组织显示，通过硼化物和晶粒特征可以很容易地区分出大变形区。接触区硼化物粗化的增强是应变、位错、应力和升温共同作用的结果。应变速率对致密化无明显影响，但对颗粒变形有显著影响。此外，还讨论了高应变速率增强颗粒变形的机理。

引用次数: 0

首页上一页

下一页尾页

类型

全部化学•材料生命科学医学物理工程技术环境•农林材料科学地球科学法学管理学化学环境科学与生态学计算机科学教育学经济学农林科学人文科学生物学数学物理与天体物理心理学综合性期刊其他工业工程理学历史学农学文学信息工程

数据库

全部 ACS Publications Elsevier ieeexplore Springer The Royal Society of Chemistry Wiley

期刊

Powder Metallurgy

全部 Acc. Chem. Res. ACS Applied Bio Materials ACS Appl. Electron. Mater. ACS Appl. Energy Mater. ACS Appl. Mater. Interfaces ACS Appl. Nano Mater. ACS Appl. Polym. Mater. ACS BIOMATER-SCI ENG ACS Catal. ACS Cent. Sci. ACS Chem. Biol. ACS Chemical Health & Safety ACS Chem. Neurosci. ACS Comb. Sci. ACS Earth Space Chem. ACS Energy Lett. ACS Infect. Dis. ACS Macro Lett. ACS Mater. Lett. ACS Med. Chem. Lett. ACS Nano ACS Omega ACS Photonics ACS Sens. ACS Sustainable Chem. Eng. ACS Synth. Biol. Anal. Chem. BIOCHEMISTRY-US Bioconjugate Chem. BIOMACROMOLECULES Chem. Res. Toxicol. Chem. Rev. Chem. Mater. CRYST GROWTH DES ENERG FUEL Environ. Sci. Technol. Environ. Sci. Technol. Lett. Eur. J. Inorg. Chem. IND ENG CHEM RES Inorg. Chem. J. Agric. Food. Chem. J. Chem. Eng. Data J. Chem. Educ. J. Chem. Inf. Model. J. Chem. Theory Comput. J. Med. Chem. J. Nat. Prod. J PROTEOME RES J. Am. Chem. Soc. LANGMUIR MACROMOLECULES Mol. Pharmaceutics Nano Lett. Org. Lett. ORG PROCESS RES DEV ORGANOMETALLICS J. Org. Chem. J. Phys. Chem. J. Phys. Chem. A J. Phys. Chem. B J. Phys. Chem. C J. Phys. Chem. Lett. Analyst Anal. Methods Biomater. Sci. Catal. Sci. Technol. Chem. Commun. Chem. Soc. Rev. CHEM EDUC RES PRACT CRYSTENGCOMM Dalton Trans. Energy Environ. Sci. ENVIRON SCI-NANO ENVIRON SCI-PROC IMP ENVIRON SCI-WAT RES Faraday Discuss. Food Funct. Green Chem. Inorg. Chem. Front. Integr. Biol. J. Anal. At. Spectrom. J. Mater. Chem. A J. Mater. Chem. B J. Mater. Chem. C Lab Chip Mater. Chem. Front. Mater. Horiz. MEDCHEMCOMM Metallomics Mol. Biosyst. Mol. Syst. Des. Eng. Nanoscale Nanoscale Horiz. Nat. Prod. Rep. New J. Chem. Org. Biomol. Chem. Org. Chem. Front. PHOTOCH PHOTOBIO SCI PCCP Polym. Chem.

﹀