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个人信息Personal Information
教授级高工
硕士生导师
任职 : 大连理工大学材料测试分析中心 负责人
性别：男
毕业院校：大连理工大学
学位：硕士
所在单位：材料科学与工程学院
学科：材料学
办公地点：大连理工大学材料科学与工程学院 材料实验中心 材料馆131
联系方式：15509867057 zoulong@dlut.edu.cn
电子邮箱：zoulong@dlut.edu.cn
Combined quantitative evaluation on early-stage fatigue damage of coarse-grained austenite stainless steel based on EBSD and ultrasonic technique
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论文类型：期刊论文
发表时间：2020-04-01
发表刊物：ULTRASONICS
收录刊物：PubMed、EI、SCIE
卷号：103
页面范围：106090
ISSN号：0041-624X
关键字：Coarse-grained austenite; Fatigue damage; Electron backscatter diffraction; Ultrasonic; Grain scale
摘要：The elastic anisotropy and heterogeneity effects of coarse-grained austenite on ultrasonic propagation significantly undermine the effectiveness of ultrasonic property-based fatigue damage evaluation. A discrete method based on electron backscatter diffraction (EBSD) was proposed to decouple the effects between coarse-grained structure and fatigue damage. An orientation-based damage index, local misorientation (M-L), was extracted and macroscopic and microscopic plastic deformations were characterized. The evolution of ultrasonic attenuation coefficient Delta alpha was established with Delta M-L in grain scale. Approximate downward parabolas was observed, and the peak value of Delta alpha in < 1 1 1 > orientation was found to be larger and more sensitive to the cyclic damage than that of < 0 0 1 > and < 0 1 1 >. The influences of the heterogeneous substructure and surface roughness were discussed respectively.