文献类型：期刊文献

英文题名：A Novel Model for Evaluating the Strain-Controlled Fracture Behavior in Strip Martensite Steel

作者：Shao-Lei, Long Yi, Yan-Liang Shan, Wu Hao-Dong, Zhang Min, Ling Xiang-Lan, Luo Xiao, Long Yi-Long, Liang

第一作者：Shao-Lei, Long

机构：[1] School of Materials and Energy, Guizhou Institute of Technology, Guiyang, Guizhou, 550003, China; [2] College of Material and Metallurgy, Guizhou University, Guiyang, Guizhou, 550028, China; [3] Institute of Advance Wear & Corrosion Resistant and Functional Materials, Jinan University, Guangdong, Guangzhou, 510632, China; [4] School of Chemistry and Materials science, Guizhou Education University, Guiyang, Guizhou, 550018, China

第一机构：贵州理工学院

年份：2023

外文期刊名：SSRN

收录：EI(收录号：20230324160)

语种：英文

外文关键词：Brittle fracture - Fracture mechanics - Martensite - Plasticity

摘要：To address the challenges posed by the limitations of the Hall-Petch equation for strip martensite steel and the complex relationship between its macro-plasticity/toughness (MATP) and micro-plasticity/toughness (MITP), a composite parameter model (CPM) was developed, factoring in strain-controlled fracture . The fracture behavior of strip martensite steel and fracture characteristics were investigated in detail. The fracture morphology results showed that the effective grain of plasticity/toughness from the lath martensite steel involved in the ductile fracture was martensite lath, while the brittle fracture was martensite packet. It was found that the Hall-Petch equation was not applicable due to different fracture modes of the same material under different heat treatment processes, as well as the equivalent size and the small angle orientation of martensite laths. However, the CPM effectively determined the effective grains of MATP and MITP as laths in the strain-controlled fracture, and the Di of MATP and MITP less than 1, revealing the consistent relationship between MATP and MITP. In addition, although Di was infinite in the stress-controlled fracture, which rendered CPM practically insignificant, it effectively revealed the relationship between MATP and MITP. Moreover, the relationship between CPM and the critical cavity expansion ratio revealed the microscopic characteristics of the macroscopic change during ductile fractures, providing a fresh perspective for studying the coupling relationship of mechanical properties. ? 2023, The Authors. All rights reserved.