期刊
METALS
卷 8, 期 1, 页码 -出版社
MDPI
DOI: 10.3390/met8010014
关键词
low-cycle fatigue; strain-inducedmartensite; non-destructive evaluation; ultrasonic nonlinearity
资金
- National Research Foundation of Korea (NRF) - Ministry of Education [2017R1D1A3B03028681]
- MSIP [2008-0062283]
- National Research Foundation of Korea [2017R1D1A3B03028681] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Strain-induced phase transformation and damage accumulation in austenitic stainless steel subjected to cyclic loading were investigated by nondestructive evaluation. The cyclic loading test was performed at various strain amplitudes at the same strain rate. The volume fraction of the strain-induced phase transformation (alpha'-martensite) was determined by ferrite scope and magnetic coercivity measurement. The damage accumulation and microstructure of cyclic loading specimens were characterized by microstructural observation. The cyclic hardening and cyclic softening behavior are discussed in terms of the generation of strain-induced martensite phases and a dislocation substructure at each strain amplitude. The volume fraction of the strain-induced phase increased with the strain amplitude. The increase in alpha'-martensite was evaluated by measuring the ultrasonic nonlinearity parameter. The presence of alpha'-martensite is sufficient to distort the austenitic matrix due to an interface misfit between the austenite matrix and alpha'martensite, resulting in wave distortion of the longitudinal wave. From this wave distortion, super-harmonics may be generated with nucleation of the strain-induced martensite, a process that strongly depends on the strain amplitude.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据