首页> 外文学位 >Microstructural studies on failure mechanisms in thermo-mechanical fatigue of repaired DS R80 and IN 738 Superalloys.

【24h】

Microstructural studies on failure mechanisms in thermo-mechanical fatigue of repaired DS R80 and IN 738 Superalloys.

机译：修复的DS R80和IN 738高温合金热机械疲劳失效机理的微观结构研究。

获取原文

获取原文并翻译 | 示例

页面导航

摘要
著录项
相似文献
相关主题

摘要

Directionally solidified Rene 80 (DS R80) and polycrystalline Inconel 738(IN 738) Superalloys were tested in thermo-mechanical fatigue (TMF) over the temperature range of 500-900°C and plastic strain range from 0.1 to 0.8% using a DSI Gleeble thermal simulator. Thermo-mechanical testing was carried out on the parent material (baseline) in the conventional solution treated and aged condition (STA), as well as gas tungsten arc welded (GTAW) with an IN-738 filler, followed by solution treatment and ageing. Comparison of the baseline alloy microstructure with that of the welded and heat treated alloy showed that varying crack initiation mechanisms, notably oxidation by stress assisted grain boundary oxidation, grain boundary MC carbides fatigue crack initiation, fatigue crack initiation from sample surfaces, crack initiation from weld defects and creep deformation were operating, leading to different "weakest link" and failure initiation points. The observations from this study show that the repaired samples had extra crack initiation sites not present in the baseline, which accounted for their occasional poor fatigue life. These defects include lack of fusion between the weld and the base metal, fusion zone cracking, and heat affected zone microfissures.

机译：使用DSI Gleeble在500-900°C的温度范围内以及在0.1％到0.8％的塑性应变范围内，对定向凝固的Rene 80（DS R80）和多晶Inconel 738（IN 738）高温合金进行了热机械疲劳（TMF）测试热仿真器。在常规固溶处理和时效条件下（STA）对母体材料（基线）进行热机械测试，并使用IN-738填充剂进行钨极气体保护焊（GTAW），然后进行固溶处理和时效。将基线合金的微观结构与焊接和热处理的合金的微观结构进行比较后发现，不同的裂纹萌生机理，尤其是应力辅助的晶界氧化，晶界MC碳化物的疲劳裂纹萌生，样品表面的疲劳裂纹萌生，焊缝的裂纹萌生。缺陷和蠕变变形正在运行，导致出现不同的“最弱连接”和破坏起始点。这项研究的观察结果表明，修复后的样品具有基线中不存在的额外裂纹萌生部位，这是造成它们有时疲劳寿命较差的原因。这些缺陷包括焊缝与母材之间缺乏熔合，熔合区开裂和热影响区微裂纹。

著录项

作者
Abrokwah, Emmanuel Otchere.;
展开▼
作者单位

University of Manitoba (Canada).;

展开▼
授予单位 University of Manitoba (Canada).;
学科 Engineering Materials Science.
学位 M.Sc.
年度 2012
页码 163 p.
总页数 163
原文格式 PDF
正文语种 eng
中图分类
关键词

相似文献

外文文献
中文文献
专利

1. Scientific Opinion on the substantiation of health claims related to L‐carnitine and faster recovery from muscle fatigue after exercise (ID 738, 1492, 1493), skeletal muscle tissue repair (ID 738, 1492, 1493), increase in endurance capacity (ID 4305, 4684), maintenance of normal blood LDL‐cholesterol concentrations (ID 1494, 4684), contribution to normal spermatogenesis (ID 1822), “energy metabolism” (ID 1821), and increasing L‐carnitine concentrations and/or decreasing free fatty acids in blood during pregnancy (ID 1495) pursuant to Article 13(1) of Regulation (EC) No 1924/2006 [J] . EFSA Journal . 2011,第6期

机译：关于证实左旋肉碱的健康主张的科学意见，以及运动后从肌肉疲劳中更快恢复（ID 738、1492、1493），骨骼肌组织修复（ID 738、1492、1493），耐力提高（ID 4305）（4684），维持正常血液中LDL-胆固醇的浓度（ID 1494、4684），对正常精子发生（ID 1822），“能量代谢”（ID 1821）的贡献以及L-肉碱浓度的增加和/或游离脂肪酸的减少根据第1924/2006号法规（EC）第13（1）条在怀孕期间的血液中（ID 1495）
2. Investigation of isothermal and thermo-mechanical fatigue behavior of the nickel-base superalloy IN738LC using standardized and advanced test methods [J] . D. Hollaender, D. Kulawinski, M. Thiele, Materials Science and Engineering . 2016,第jula18期

机译：使用标准化和先进的测试方法研究镍基高温合金IN738LC的等温和热机械疲劳行为
3. Prediction of Thermo-Mechanical Fatigue Life of IN738 LC Using the Finite Element Analysis [J] . Jeong-Min Lee, Chang-Sung Seok, Dongkeun Lee, International Journal of Precision Engineering and Manufacturing . 2014,第8期

机译：有限元分析预测IN738 LC的热机械疲劳寿命
4. Low Cycle Fatigue Failure and Microstructural Change of Aluminum Alloy Subjected to Thermo-Mechanical Loading [C] . K. Sasaki, T. Takahashi, H. Numao Progress in Mechanical Behaviour of Materials . 1999

机译：热机械载荷作用下铝合金的低周疲劳破坏和组织变化
5. Microstructural indicators of transition mechanisms in time-dependent fatigue crack growth in nickel base superalloys. [D] . Heeter, Ann E. 2014

机译：镍基高温合金中随时间变化的疲劳裂纹扩展的过渡机制的微观结构指标。
6. Development of an Ultra-Low Carbon MgO Refractory Doped with α-Al2O3 Nanoparticles for the Steelmaking Industry: A Microstructural and Thermo-Mechanical Study [O] . C. Gómez-Rodríguez, G. A. Castillo-Rodríguez, E. A. Rodríguez-Castellanos, 2020

机译：含α-Al2O3纳米粒子的超低碳MgO耐火材料的开发用于炼钢工业：微观结构和热机械研究
7. EFSA Panel on Dietetic Products, Nutrition and Allergies (NDA); Scientific Opinion on the substantiation of health claims related to L-carnitine and faster recovery from muscle fatigue after exercise (ID 738, 1492, 1493), skeletal muscle tissue repair (ID 738, 1492, 1493), increase in endurance capacity (ID 4305, 4684), maintenance of normal blood LDL-cholesterol concentrations (ID 1494, 4684), contribution to normal spermatogenesis (ID 1822), “energy metabolism” (ID 1821), and increasing L-carnitine concentrations and/or decreasing free fatty acids in blood during pregnancy (ID 1495) pursuant to Article 13(1) of Regulation (EC) No 1924/2006 [O] . Tetens Inge 2011

机译：EFsa饮食产品，营养和过敏专家组（NDa）;关于证实与左旋肉碱有关的健康声明和运动后肌肉疲劳恢复更快的证据（ID 738,1492,1493），骨骼肌组织修复（ID 738,1492,1493），耐力增加（ID 4305），4684），维持正常血液LDL-胆固醇浓度（ID 1494,4684），对正常精子发生的贡献（ID 1822），“能量代谢”（ID 1821），以及增加L-肉碱浓度和/或降低游离脂肪酸根据（EC）第1924/2006号条例第13（1）条，在怀孕期间血液中的血液（ID 1495）
8. Microstructural Study of Failure Mechanisms during Mechanical Testing in Coal Gasification Environments [R] . Page, R. A. 1982

机译：煤气化环境力学试验失效机理的微观结构研究

Microstructural studies on failure mechanisms in thermo-mechanical fatigue of repaired DS R80 and IN 738 Superalloys.

摘要

著录项

相似文献

相关主题

期刊订阅