Cyclic Deformation and Fatigue Crack Growth Behavior in Fe-Mn-C-(Al) TWIP Steels
We demonstrate a strong dependence of cyclic stress response,fatigue crack growth threshold and crack growth rate on Al addition in Fe-Mn-C TWIP steels.Al increases the monotonic yield strength,but shows smaller initial cyclic hardening and larger later-stage cyclic softening,thus decreasing the cyclic yield strength.Furthermore,Al decreases the low-cycle fatigue lifetime and increases the fatigue crack growth threshold.The results are discussed in terms of crack deflection and roughness-induced crack closure,which is associated with the local microstructure,the evolution of substructure,the local non-uniform deformation and deformation mode,by means of OM and TEM observations,digital image correlation (DIC) method and synchrotron x-ray computed tomography (CT) analyses.
low-cycle fatigue cyclic deformation fatigue crack growth resistance twinning-induced plasticity steel
QIAN Lihe LIU Shuai MA Penghui GUO Pengcheng MENG Jiangying ZHANG Fucheng
State Key Laboratory of Metastable Materials Science and Technology, Yanshan University,Qinhuangdao State Key Laboratory of Metastable Materials Science and Technology, Yanshan University,Qinhuangdao
国际会议
成都
英文
199-202
2016-11-16（万方平台首次上网日期，不代表论文的发表时间）