Pub Date : 2023-12-01DOI: 10.15407/materials2023.07.003
A. O. Gorpenko, O. I. Semenets
The restoration of the surface of damaged parts made of high-strength titanium alloys by the method of restorative surfacing with the use of filler wires is a quite reasonable and promising technique since its aims is to restore a partially damaged surface of parts while preserving their strength properties. However, this technique requires a significant number of static, fatigue and corrosion tests to be followed by suitable processing of the obtained results to correct or improve even the welding technology. The main purpose of the research was to study the fatigue behavior of samples with a restored surface by the method of metal surfacing. Fatigue tests were carried out on VT-22 alloy samples, the surface of which was restored by surfacing using SP-15 and VT-22 filler wires. Fractography revealed the presence of several welding defects (pores mainly) located both in the zone of the deposited metal and on its borders. These conclusions summarize the obtained research results and provide important information about the correlation between welding defects, fatigue strength, and the properties of the VT-22 alloy. The results showed that the presence of these defects is primarily related to the initiation of fatigue cracks. The size and shape of defects, as well as their location relative to the deposited layer, also affected the reduction of fatigue properties. Correcting the surfacing conditions may significantly reduce the critical size of defects and, as a result, significantly increase the residual life of restored parts. Keywords: high-strength titanium alloy VT-22, welding pores, segregation of defects, zone of thermal influence, cyclic loading.
{"title":"The influence of welding defects on the fracture mechanism of samples made of the VT-22 alloy, with the use of restorative surfacing with filler wires","authors":"A. O. Gorpenko, O. I. Semenets","doi":"10.15407/materials2023.07.003","DOIUrl":"https://doi.org/10.15407/materials2023.07.003","url":null,"abstract":"The restoration of the surface of damaged parts made of high-strength titanium alloys by the method of restorative surfacing with the use of filler wires is a quite reasonable and promising technique since its aims is to restore a partially damaged surface of parts while preserving their strength properties. However, this technique requires a significant number of static, fatigue and corrosion tests to be followed by suitable processing of the obtained results to correct or improve even the welding technology. The main purpose of the research was to study the fatigue behavior of samples with a restored surface by the method of metal surfacing. Fatigue tests were carried out on VT-22 alloy samples, the surface of which was restored by surfacing using SP-15 and VT-22 filler wires. Fractography revealed the presence of several welding defects (pores mainly) located both in the zone of the deposited metal and on its borders. These conclusions summarize the obtained research results and provide important information about the correlation between welding defects, fatigue strength, and the properties of the VT-22 alloy. The results showed that the presence of these defects is primarily related to the initiation of fatigue cracks. The size and shape of defects, as well as their location relative to the deposited layer, also affected the reduction of fatigue properties. Correcting the surfacing conditions may significantly reduce the critical size of defects and, as a result, significantly increase the residual life of restored parts. Keywords: high-strength titanium alloy VT-22, welding pores, segregation of defects, zone of thermal influence, cyclic loading.","PeriodicalId":509971,"journal":{"name":"Uspihi materialoznavstva","volume":"155 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139191943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-01DOI: 10.15407/materials2023.07.010
M. Grigorenko, E. Chernigovtsev, O. Durov, V. Poluyanska, A. Ievtushenko
Semiconductor oxide materials such as gallium, indium and zinc oxides play an important role in a development and production of a variety of electronic devices. Experimental studies of these materials allow to define, for example energetic or other physical parameters of the devices created and also to improve existing technologies of their production, metallization and joining of electrocontacts by way of brazing which require additional wetting studies. It should be noted that data on wetting of mentioned oxides by metals are practically absent in literature. Thus a detailed experimental study of the interfacial interaction, adhesion and wetting of Ga2O3, In2O3 and ZnO oxide materials with some pure metal melts (Ga, In, Sn, Au,Ge, Ag, Cu) in vacuum was performed by the sessile drop method using photo- and video- fixing including temporal and temperature dependencies of contact angles. It was found that pure metals don't wet powdery pressed specimens of Ga and In oxides in the temperature range studied and vary in a rather narrow range. For ZnO system the significant effect of experiment temperature and hold-up time on the values of contact angles for some metals (Ga, Ge, Sn, Cu) is observed. For example wetting angles for Ga change from above 90 degrees at low temperatures up to 49 and full spreading at 1173⎯1373 K. This effect may be attributed to the activation of chemical reactions, change of oxide stabilities at high temperatures at the interface. Last metals can be used as adhesive-active additions to base brazing alloy. Keywords: gallium, indium, zinc oxides, semiconductor, wetting, contact interaction, metal melt.
镓、铟和锌氧化物等半导体氧化物材料在各种电子设备的开发和生产中发挥着重要作用。通过对这些材料的实验研究，可以确定所制造设备的能量或其他物理参数，还可以改进现有的生产、金属化和通过钎焊连接电接触的技术，这些都需要额外的润湿研究。值得注意的是，文献中几乎没有关于上述氧化物与金属润湿的数据。因此，我们采用无柄液滴法，通过光电和视频固定，包括接触角的时间和温度依赖性，对 Ga2O3、In2O3 和 ZnO 氧化物材料与一些纯金属熔体（Ga、In、Sn、Au、Ge、Ag、Cu）在真空中的界面相互作用、粘附和润湿进行了详细的实验研究。研究发现，在所研究的温度范围内，纯金属不会润湿 Ga 和 In 氧化物的粉末压制试样，而且变化范围相当小。对于氧化锌体系，实验温度和保持时间对某些金属（Ga、Ge、Sn、Cu）的接触角值有显著影响。例如，镓的润湿角从低温下的 90 度以上变为 49 度，在 1173-1373 K 时完全扩散。这种影响可能是由于化学反应的激活、界面高温下氧化物稳定性的变化。最后一种金属可用作基础钎焊合金的粘合活性添加剂。关键词：镓、铟、锌氧化物、半导体、润湿、接触相互作用、金属熔体。
{"title":"Wetting and contact interaction of semconductor oxide materials Ga2O3, In2O3, ZnO with metallic melts in vacuum","authors":"M. Grigorenko, E. Chernigovtsev, O. Durov, V. Poluyanska, A. Ievtushenko","doi":"10.15407/materials2023.07.010","DOIUrl":"https://doi.org/10.15407/materials2023.07.010","url":null,"abstract":"Semiconductor oxide materials such as gallium, indium and zinc oxides play an important role in a development and production of a variety of electronic devices. Experimental studies of these materials allow to define, for example energetic or other physical parameters of the devices created and also to improve existing technologies of their production, metallization and joining of electrocontacts by way of brazing which require additional wetting studies. It should be noted that data on wetting of mentioned oxides by metals are practically absent in literature. Thus a detailed experimental study of the interfacial interaction, adhesion and wetting of Ga2O3, In2O3 and ZnO oxide materials with some pure metal melts (Ga, In, Sn, Au,Ge, Ag, Cu) in vacuum was performed by the sessile drop method using photo- and video- fixing including temporal and temperature dependencies of contact angles. It was found that pure metals don't wet powdery pressed specimens of Ga and In oxides in the temperature range studied and vary in a rather narrow range. For ZnO system the significant effect of experiment temperature and hold-up time on the values of contact angles for some metals (Ga, Ge, Sn, Cu) is observed. For example wetting angles for Ga change from above 90 degrees at low temperatures up to 49 and full spreading at 1173⎯1373 K. This effect may be attributed to the activation of chemical reactions, change of oxide stabilities at high temperatures at the interface. Last metals can be used as adhesive-active additions to base brazing alloy. Keywords: gallium, indium, zinc oxides, semiconductor, wetting, contact interaction, metal melt.","PeriodicalId":509971,"journal":{"name":"Uspihi materialoznavstva","volume":"63 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139190074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：