Masing Behavior and Microstructural Change of Quenched and Tempered High-Strength Steel Under Low Cycle Fatigue

论文摘要

Low cycle fatigue behavior of a quenched and tempered high-strength steel（Q960 E） was studied in the strain amplitude ranging from ± 0.5% to ± 1.2% at room temperature. As a result of fatigue loading, the dislocation structural evolution and fracture mechanism were examined and studied by transmission electron microscopy and scanning electron microscopy（SEM）. The results showed that this Q960 E steel showed cyclic softening at different strain amplitudes, and the softening tendency was more apparent at strain amplitude of ±（0.6–1.2）% than that at ± 0.5%. The reduction in dislocation density with increasing strain amplitude is responsible for the softening tendency of cyclic stress with the strain amplitude. The material illustrates near-Masing behavior at strain amplitude ranging from ± 0.6% to ± 1.2%. The near-Masing behavior of Q960 E high-strength steel can be the result of stability of martensite lath at different strain amplitudes. Partial transformation from martensite laths to dislocation cells is responsible for the derivation from ideal Masing behavior. In the SEM examination of fracture surfaces, transgranular cracks initiate on the sample surface. Striations can be found during the crack propagation stage.

论文目录

• 1 Introduction
• 2 Experimental
• 3 Results and Discussion
•   3.1 Cyclic Stress Response Curves
•   3.2 Hysteresis Loops and Cyclic Stress–Strain Curve
•   3.3 Masing and non-Masing Behavior
•   3.4 Microstructure
•   3.5 Crack Propagation and Fracture Features
• 4 Conclusions

文章来源

类型: 期刊论文

作者: Feng-Mei Bai,Hong-Wei Zhou,Xiang-Hua Liu,Meng Song,Ya-Xin Sun,Hai-Long Yi,Zhen-Yi Huang

来源: Acta Metallurgica Sinica(English Letters) 2019年11期

年度: 2019

分类: 工程科技Ⅰ辑

专业: 金属学及金属工艺

单位: State Key Laboratory of Rolling and Automation , Northeastern University,School of Metallurgical Engineering , Anhui University of Technology,School of Materials Science and Engineering, Anhui Key Lab of Materials Science and Processing , Anhui University of Technology

基金: financial supports of the National Natural Science Foundation of China (No. 51674079),Anhui Provincial Natural Science Foundation (Nos. KJ2018A0062,KJ2017A128 and KJ2017A066)

分类号: TG161

页码: 1346-1354

总页数: 9

文件大小: 6272K

下载量: 18