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学历：博士研究生毕业
学位：工学博士学位
性别：男
学科：力学. 航空宇航科学与技术. 材料科学与工程. 机械工程. 冶金工程. 先进制造. 航空工程. 材料工程. 冶金工程. 机械工程. 固体力学
多尺度与微纳米力学，梯度结构材料，界面力学，固体本构关系，应变梯度理论，晶体塑性有限元，离散位错动力学，分子动力学，高熵合金，大数据与机器学习，材料基因，极端力学，高性能材料
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2022-03-24 合作论文“The effect of microstructure evolution on the ratchetting-fatigue interaction of carbide-free bainite rail steels under different heat-treatment conditions”在International Journal of Fatigue在线发表
Highlights
•The carbide-free bainitic (CFB) rail steels show a non-saturated three-stage cyclic softening feature.
•The ratchetting strain presents different evolutions in fatigue failure and ratchetting failure modes.
•Ratchetting deformation promotes the development of stable dislocation substructure and transformation of blocky RA.
•The resistances of ratchetting deformation and low-cycle fatigue of 1380 rail steel are better than that of 1280 rail steel.
Abstract
Low-cycle fatigue experiments emphasizing the ratchetting are performed on the carbide-free bainitic (CFB) rail steel under different heat-treatment conditions. The effects of microstructure and retained austenite (RA) on the ratchetting-fatigue interaction are investigated through macroscopic and microscopic characterizations. The results indicate that the CFB rail steel exhibits a non-saturated and strain amplitude-dependent cyclic softening feature and shows different ratchetting behaviors and failure modes at various stress levels. Ratchetting promotes the development of stable dislocation substructure and the transformation of blocky RA. The fatigue resistance of 1380 grade CFB steel under the online controlled cooling conditions is better than that of 1280 grade CFB steel under the air-cooling condition.
Link
https://doi.org/10.1016/j.ijfatigue.2022.106872