Analysis of fracture toughness in high Co-Ni secondary hardening steel using FEM

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• 作者：Chenchong Wang^a ; Chi Zhang^a ; ^{chizhang@tsinghua.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Zhigang Yang^a ; Jie Su^b ; Yuqing Weng^a ; ^b
• 关键词：Austenite layer ; Fracture toughness ; Finite element method
• 刊名：Materials Science & Engineering A
• 出版年：2015
• 出版时间：14 October 2015
• 年：2015
• 卷：646
• 期：Complete
• 页码：1-7
• 全文大小：5740 K

文摘

The microstructure and mechanical properties of ultrahigh strength steels (300M, Aermet100 and M54) were analyzed. The experiment results showed that the steels with austenite layers at the boundary of martensite laths had higher K_IC than those without austenite layers. Finite element method (FEM) was used to establish models based on the actual microstructure of the steels. Extended finite element method (XFEM) was used to study the crack path and crack growth rate. Contour integral method (CIM) was used to study the best thickness of austenite layer, the effect of crack propagation direction and the value of K_IC. According to the simulation results, 10–15 nm was the best thickness of austenite layer for the fracture toughness of the steels with martensite as matrix. The simulation results of normalized value of K_IC were close to the experimental results.