文献类型：期刊文献

英文题名：Achieving high tensile properties and impact toughness in ultrahigh strength lean alloy steel by quenching and partitioning treatment

作者：Wang, Lirong Liang, Yilong Zhao, Fei Xu, Fahong Lei, Lei Long, Shaolei Yang, Ming Jiang, Yun

第一作者：Wang, Lirong

机构：[1] School of Materials and Metallurgy, Guizhou University, Guiyang, 550025, China; [2] Guizhou Special Equipment Inspection and Testing Institute, Guiyang, 550025, China; [3] School of Physics and Optoelectronic Engineering, Yangtze University, Jingzhou, 434023, China; [4] School of Mechanical Engineering, Guizhou Institute of Technology, Guiyang, 550003, China

第一机构：School of Materials and Metallurgy, Guizhou University, Guiyang, 550025, China

通信机构：School of Materials and Metallurgy, Guizhou University, Guiyang, 550025, China;School of Materials and Metallurgy, Guizhou University, Guiyang, 550025, China

年份：2024

卷号：24

期号：1

外文期刊名：Archives of Civil and Mechanical Engineering

收录：EI(收录号：20240115302767)

语种：英文

外文关键词：Alloy steel - Bainite - Grain boundaries - High strength alloys - High strength steel - Low carbon steel - Manganese alloys - Manganese steel - Martensite - Microstructure - Quenching - Steel metallurgy

摘要：In this study, a desirable combination of strength, ductility, and toughness in low-carbon 30CrMnSiA steel is achieved by a hierarchical multiphase microstructural architecture subjected to one- and two-step quenching and partitioning (Q&P) processes. The microstructural constituents are studied by EBSD, x-ray diffraction, dilatometry, and TEM. Experimental results show that microstructural refinement occurs in the martensite and bainite at a lower quenching temperature, where more Bain groups form in one close-packed plane group. This causes random distribution between martensite and bainite blocks, enlarging the volume of high-angle grain boundaries. Such refined microstructure, particularly for the increased martensite with higher-density dislocations, causes an increased strength at a decreased quenching temperature. By comparison, increased quenching and partitioning temperature produces more stable film-like retained austenite (RA) and a low dislocation density in martensite/bainite (M/B); thus, it provides better deformation by accommodating with M/B laths and absorbing substantial energy due to the transformation-induced plasticity effect. The lower dislocation density, the higher volume fraction of RA, and the higher HAGBs improve the impact toughness and tensile properties of lean alloy steel through a moderate Q&P process. ? 2023, Wroclaw University of Science and Technology.