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Engineering Steels and High Entropy-Alloys最新文献

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Laser Surface Treatment 激光表面处理
Pub Date : 2020-06-24 DOI: 10.5772/intechopen.91800
A. A. Siddiqui, A. K. Dubey
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引用次数: 1
Morphology Evolution of DF2 (AISI-O1) Surface Micromachined by Pulsed Nd:YAG Laser 脉冲Nd:YAG激光微加工DF2 (AISI-O1)表面的形貌演变
Pub Date : 2020-06-24 DOI: 10.5772/intechopen.89189
K. Guo
Pulsed Nd:YAG laser was taken to premicromachine DF2 (AISI-O1) cold work steel. The effect of laser-irradiated parameters on the morphology evolution of the processed surface was investigated by 3D profilometer, atomic force microscope (AFM), scanning electron microscopy (SEM), and optical microscopy (OM). Results show that when DF2 (AISI-O1) specimens were irradiated with various parameters, the morphology of DF2 (AISI-O1) cold work steel was changed correspondingly. Moreover, it demonstrates that for a given laser, various kinds of morphology of a laser-machined surface could be established successfully to satisfy with the desired finish surface for the practical applications later.
采用脉冲Nd:YAG激光对DF2 (AISI-O1)冷作钢进行预微加工。采用三维轮廓仪、原子力显微镜(AFM)、扫描电镜(SEM)和光学显微镜(OM)研究了激光辐照参数对加工表面形貌演变的影响。结果表明:DF2 (AISI-O1)试样经不同参数辐照后,DF2 (AISI-O1)冷作钢的形貌发生了相应的变化。此外,对于给定的激光器,可以成功地建立激光加工表面的各种形态,以满足后续实际应用所需的精加工表面。
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引用次数: 0
Phase Transformation in Micro-Alloyed Steels 微合金钢的相变
Pub Date : 2020-05-20 DOI: 10.5772/intechopen.91468
F. Khan, H. Rashed
Phase transformation in crystalline solid is an important factor that designs the microstructure and plays a great role in alloy development. Iron has an allotropic form, and this unique metallurgical property leads to phase transformation. Addition of micro-alloying elements enhances the phase transformation scenarios in steels. Phase transformation due to the addition of micro-alloying elements, together with exceptional precipitation hardening capabilities, substantially improves mechanical properties of steels of different grades. Ferrite transforming to other phases reduces the hardenability of steels. Micro-addition of elements forms precipitation in ferrite and austenite, which controls the microstructure and hence the mechanical properties of steels. Besides, interactions between different deformation sequences used in the production of steel and addition of elements as solute or precipitates regulate the microstructure. Ferrite grain refinement depends on the refinement of austenite grain size in one case, and austenite grain size growth can be varied by addition of various elements. Thus, a variety of elements influences phase transformation that leads to significantly modified properties.
结晶固体的相变是影响合金组织设计的重要因素,对合金的发展起着重要的作用。铁具有同素异形体,这种独特的冶金性质导致了相变。微量合金元素的加入改善了钢的相变情况。由于添加了微合金元素而发生的相变,加上特殊的沉淀硬化能力,大大提高了不同牌号钢的机械性能。铁素体转变为其他相降低了钢的淬透性。微量元素的加入在铁素体和奥氏体中形成沉淀,从而控制钢的显微组织和机械性能。此外,钢生产中不同变形顺序之间的相互作用以及溶质或析出相等元素的添加调节了显微组织。铁素体晶粒细化在某种程度上取决于奥氏体晶粒的细化,而奥氏体晶粒的细化可以通过添加各种元素来改变。因此,多种元素影响相变,导致性能显著改变。
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引用次数: 0
High-Entropy Alloys for Micro- and Nanojoining Applications 用于微纳米连接的高熵合金
Pub Date : 2020-04-06 DOI: 10.5772/intechopen.91166
Ashutosh Sharma
The aim of this chapter is to provide a basic understanding of the metal-ceramic joints and high-entropy alloy (HEA) research in microjoining applications. We will first overview the issues in metal-ceramic brazing and solutions to overcome those issues using various fillers. Various approaches are available for joining ceramic to metallic materials. One approach will be to look for brazing alloys with the so-called high-entropy characteristics which exhibit a solid solution phase. The conventional alloy design and arc melting, Bridgman solidification, and advanced powder metallurgy techniques will be studied, including high-energy ball milling (HEBM) for the mechanical alloying process, and hot-press and spark plasma sintering (SPS) techniques are utilized for improved densification and phase transformation. We also summarize the various thermodynamic relations to obtain the high-entropy phase and present future possibilities of high-entropy alloys in microjoining research at the later stage of this chapter.
本章的目的是为金属陶瓷接头和高熵合金(HEA)在微连接中的应用研究提供一个基本的认识。我们将首先概述金属陶瓷钎焊中的问题以及使用各种填料克服这些问题的解决方案。将陶瓷与金属材料连接的方法有很多种。一种方法是寻找具有所谓的高熵特性的钎焊合金,它表现为固溶体。将研究传统的合金设计和电弧熔化、Bridgman凝固以及先进的粉末冶金技术,包括用于机械合金化过程的高能球磨(HEBM),以及用于改进致密化和相变的热压和火花等离子烧结(SPS)技术。我们还总结了获得高熵相的各种热力学关系,并在本章后期提出了高熵合金在微连接研究中的未来可能性。
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引用次数: 7
Technologies of High-Temperature Insulating Coatings on Stainless Steels 不锈钢高温绝缘涂层技术
Pub Date : 2020-02-19 DOI: 10.5772/intechopen.91334
Z. Duriagina, T. Kovbasyuk, V. Kulyk, A. Trostianchyn, T. Tepla
For the use of chromium steels in instrumentation, microelectronics, and electrical engineering, their surfaces are additionally protected by coatings based on glass ceramics and other insulating materials. Such materials can operate at high temperatures for a long time under the influence of the electric current or magnetic field. This chapter describes the research results on synthesized coatings based on oxide glass ceramics and oxide materials obtained by plasma chemical vapor deposition (CVD) on the surfaces of stainless steels.
对于在仪器仪表、微电子和电气工程中使用的铬钢,它们的表面还受到基于玻璃陶瓷和其他绝缘材料的涂层的额外保护。这种材料可以在电流或磁场的影响下在高温下长时间工作。介绍了基于氧化玻璃陶瓷和等离子体化学气相沉积(CVD)技术在不锈钢表面合成涂层的研究结果。
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引用次数: 1
Development of Lightweight Steels for Automotive Applications 汽车用轻钢的发展
Pub Date : 2020-02-14 DOI: 10.5772/intechopen.91024
M. Tisza
The automotive industry plays a determinant role in the economy of developed countries. Sheet metal forming is one of the most important processes in car manufacturing. Recent trends in car production may be characterized by the application of lightweight principles. Its main priority is to fulfill both the customers’ demands and the increased legal requirements. The application of high strength steels may be regarded as one of the potential possibilities. Applying high strength steels has a positive response for many of the requirements: increasing the strength may lead to the application of thinner sheets resulting in significant mass reduction. Mass reduction is leading to lower consumption with increased environment protection. However, increasing the strength can often lead to the decrease of formability, which is very unfavorable for the forming processes. In this chapter, an overview of recent material developments in the automotive industry concerning the use of new-generation high strength steels will be given. In this paper, the material developments are emphasized from the point of view sheet metal forming; therefore, our focus is on the body-in-white manufacturing in the automotive industry.
汽车工业在发达国家的经济中起着决定性作用。钣金成形是汽车制造中最重要的工艺之一。汽车生产的最新趋势可能是轻量化原则的应用。它的首要任务是满足客户的需求和增加的法律要求。高强度钢的应用可以看作是一种潜在的可能性。应用高强度钢对许多要求都有积极的反应:提高强度可能导致应用更薄的钢板,从而显著减少质量。质量的减少导致了更低的消耗,同时增加了环境保护。然而,提高强度往往会导致成形性的降低,这对成形工艺是非常不利的。在本章中,将概述汽车工业中有关新一代高强度钢使用的最新材料发展。本文从板料成形的角度重点介绍了材料的发展;因此,我们的重点是汽车行业的白车身制造。
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引用次数: 14
Building and Architecture Paints and Coatings 建筑和建筑油漆和涂料
Pub Date : 2019-12-27 DOI: 10.5772/intechopen.90498
V. Loganina, Y. B. Mazhitov
Information is given on the strength of the coatings of cement concrete for the exterior walls of buildings. It was found that the strength of the coating depends on the quality of its appearance. A strength model is proposed depending on the surface roughness of the coating. The influence of the scale factor on the change in the strength of coatings is established. To assess the long-term strength of the coatings, we studied the temperature-time dependence of strength. The values of the activation energy of the destruction process of some coatings are experimentally determined. The dependence of the long-term strength of the coatings on tensions is given. The kinetics of changes in the short-term strength of coatings during aging is considered from the perspective of the kinetic concept of the strength of solids. The condition for coating cracking is obtained. Taking into account the influence of the scale factor and the conditions of brittle fracture of coatings, a method for choosing the optimal coating thickness is proposed. paint after 35 cycles is estimated as AD1 and AZ1, which corresponds to the state of coating with no discoloration, chalking, and dirt retention. Silicate-based coatings are more susceptible to degradation. The condition of coating based on silicate paint is estimated as AD3 and AZ3. The test results showed that the “ failure ” of coating based on silicate paint occurred after 40 freeze-thaw cycles, while the state of the coating based on polysilicate solution was evaluated as AD2 and AZ2. The “ failure ” of the coating based on the polysilicate solution occurred after 50 test cycles.
给出了用于建筑物外墙的水泥混凝土涂层强度的信息。结果表明,涂层的强度取决于其外观质量。提出了一种基于涂层表面粗糙度的强度模型。建立了水垢系数对涂层强度变化的影响。为了评估涂层的长期强度,我们研究了强度的温度-时间依赖性。用实验方法测定了某些涂层破坏过程的活化能。给出了涂层的长期强度与张力的关系。从固体强度的动力学概念出发,考虑了涂层在时效过程中短时强度变化的动力学。得到了涂层开裂的条件。考虑到涂层的尺度因子和脆性断裂条件的影响,提出了涂层最优厚度的选择方法。35次循环后的涂料估计为AD1和AZ1,对应于涂料无变色、无粉化、无污垢滞留的状态。硅酸盐基涂料更容易降解。硅酸盐涂料的涂层条件估计为AD3和AZ3。试验结果表明,在40次冻融循环后,硅酸盐涂料涂层发生“失效”,而聚硅酸盐涂料涂层的状态评价为AD2和AZ2。基于聚硅酸溶液的涂层在50次测试循环后发生“失效”。
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引用次数: 1
Isothermal Transformation Behavior and Microstructural Evolution of Micro-Alloyed Steel 微合金钢的等温相变行为及组织演变
Pub Date : 2019-11-18 DOI: 10.5772/intechopen.85900
Sanjeev Kumar
In this present study, the transformation products in micro-alloyed steel have been examined as well as isothermal decomposition of austenite into various phase formation. The rapid cooling from austenitizing temperature 1200°C to 14 different isothermal temperatures between 750 and 100°C with 50°C intervals were carried out by using dilatometric strain dilatometer on thermo-mechanical simulator. The heat treatments were delayed at different times to examine the microstructure evolution at all isothermal temperatures. The transformation kinetics was recorded during isothermal treatments and designed an isothermal transformation diagram, which is verified by microstructural changes. The results show that the initial microstructure which consists of proeutectoid ferrite and pearlite transforms into a combination of proeutectoid ferrite, pearlite, widmanstätten ferrite, upper or lower bainite, or martensite phases. The austenite grain size has been found to be decreased with a decrease in the isothermal holding temperature. The nose temperature was achieved at isothermal temperature 500°C which have been taking the least time for start and end of transformation of phases. It is also worth noticing that the start and end transformation times were observed decreasing with a decrease in the isothermal holding temperatures and after the nose transformation again gradually increased.
本文研究了微合金钢的相变产物以及奥氏体等温分解成各种相的过程。利用热-机械模拟器上的膨胀应变膨胀仪,从1200℃的奥氏体化温度快速冷却到750 ~ 100℃、间隔50℃的14种不同等温温度。在不同的时间延迟热处理,以观察在所有等温温度下的组织演变。在等温处理过程中记录了相变动力学,设计了等温相变图,并通过显微组织变化进行了验证。结果表明,由原共析铁素体和珠光体组成的初始组织转变为原共析铁素体、珠光体、widmanstätten铁素体、上贝氏体或下贝氏体或马氏体相的组合。随着等温保温温度的降低,奥氏体晶粒尺寸减小。在500°C的等温温度下获得了鼻部温度,这是相变开始和结束所需时间最少的温度。同样值得注意的是,随着等温保温温度的降低,开始和结束转变时间逐渐减少,鼻型转变后再次逐渐增加。
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引用次数: 3
Integrated Manufacturing of Fine-Grained Stainless Steels for Industries and Medicals 工业和医疗用细晶不锈钢的集成制造
Pub Date : 2019-11-14 DOI: 10.5772/intechopen.89754
T. Aizawa, T. Shiratori, T. Komatsu
Austenitic stainless steels have been widely utilized in industries, infrastruc-tures, housing structures, kitchen components, and medical tools. Higher hardness and strength as well as more improvement of wear and corrosion toughness are often required in the industrial and medical applications. Fine-grained stainless steel (FGSS) provides a solution to increase the strength without loss of ductility and toughness. Deeper research and development in manufacturing of FGSS is required to make full use of its properties toward its applications in industries and medicals. First, its mechanical properties and microstructure is introduced as a basic knowledge of FGSS with comparison to the normal stainless steels. Mechanical and laser machinability of FGSS is stated and discussed to finish the products in seconds. Its performance in metal forming and diffusion bonding is explained to explore its applications in third. Its surface treatment and tooling is discussed to describe the grain-size effect on the low temperature plasma nitriding and to demonstrate its effectiveness in die-making in forth. Finally, every aspect in manufacturing of FGSS sheets and solids is summarized as a conclusion.
奥氏体不锈钢广泛应用于工业、基础设施、房屋结构、厨房部件和医疗工具。在工业和医疗应用中,通常需要更高的硬度和强度以及更多的磨损和腐蚀韧性的改进。细晶不锈钢(FGSS)提供了在不损失延展性和韧性的情况下增加强度的解决方案。为了充分利用其在工业和医疗领域的应用,需要对FGSS的制造进行更深入的研究和开发。首先,介绍了FGSS的力学性能和微观结构,并与普通不锈钢进行了比较。论述了FGSS的机械加工性和激光加工性,以实现秒加工。第三章阐述了其在金属成形和扩散连接中的性能,探讨了其应用。讨论了低温等离子体渗氮的表面处理和加工工艺,描述了晶粒尺寸对低温等离子体渗氮的影响,并论证了低温等离子体渗氮在模具制造中的有效性。最后,总结了FGSS薄板和固体制造的各个方面,作为结论。
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引用次数: 7
High-Entropy Ceramics 熵值陶瓷
Pub Date : 2019-10-31 DOI: 10.5772/intechopen.89527
S. Alvi, Hanzhu Zhang, F. Akhtar
High-entropy ceramics is an emerging class of high-entropy materials with properties superior to conventional ceramics. Recent research has been focused on the development of new high-entropy ceramic compositions. High-entropy oxides, carbides, borides, silicides, and boron carbides had been reported with superior mechanical, oxidation, corrosion, and wear properties. The research work on the processing and characterization of bulk high-entropy ceramics and coating systems has been summarized in this chapter. The composition design, structure, chemistry, composite processing of bulk high-entropy ceramics, and evolution of microstructure and properties are reported. The literature on the deposition of high-entropy ceramic coating and the influence of coating parameters have been discussed to produce high-entropy ceramic coatings with superior mechanical, oxidation, and wear properties.
高熵陶瓷是一类新兴的高熵材料,具有优于传统陶瓷的性能。近年来的研究重点是开发新的高熵陶瓷成分。据报道,高熵氧化物、碳化物、硼化物、硅化物和碳化硼具有优异的机械、氧化、腐蚀和磨损性能。本章对大块高熵陶瓷及其涂层体系的制备、表征等方面的研究工作进行了综述。本文报道了块状高熵陶瓷的组成设计、结构、化学、复合工艺及其显微结构和性能的演变。本文讨论了高熵陶瓷涂层的沉积及涂层参数对高熵陶瓷涂层的影响,从而制备出具有优异机械性能、氧化性能和耐磨性能的高熵陶瓷涂层。
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引用次数: 82
期刊
Engineering Steels and High Entropy-Alloys
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