Microstructure and mechanical properties of a medium-carbon bainitic steel by a novel quenching and dynamic partitioning (Q-DP) process

被引：45
作者：
Li, Qiangguo [1 ]
Huang, Xuefei [1 ]
Huang, Weigang [1 ]
机构：
[1] Sichuan Univ, Coll Mat Sci & Engn, 24,South Sect 1,Yihuan Rd, Chengdu 610065, Sichuan, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2016年 / 662卷
关键词：
Dynamic partitioning; Bainite; Impact toughness; Retained austenite; Work hardening behavior; WORK-HARDENING BEHAVIOR; LOW-TEMPERATURE BAINITE; DUAL-PHASE STEELS; RETAINED AUSTENITE; MARTENSITE-TRANSFORMATION; DUCTILITY ENHANCEMENT; VOLUME FRACTION; STRENGTH; MORPHOLOGY; TOUGHNESS;
D O I：
10.1016/j.msea.2016.03.042
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A novel Quenching and Dynamic Partitioning (Q-DP) process for a 0.3C-1.4Si-1.8Mn-1.3Cr-0.3Mo (wt%) bainitic steel was developed and the microstructure and mechanical properties were investigated. The results show that the microstructure of the Q-DP treated steel consists of bainite, martensite and retained austenite, and it exhibit a better combination of tensile strength (above 1500 MPa), total elongation (above 17%) and impact toughness (above 90 J). Among the different Q-DP process, the sample treated by 250 degrees C Q-DP process exhibits the best combination of strength (1519 MPa), ductility (21.3%), the product of strength and elongation (PSE, 32.4 GPa%) and maximum impact toughness (108 J) compared to the quenching and partitioning (Q&P) process and other Q-DP processes. In addition, the work hardening behaviors of the Q&P and Q-DP samples were investigated. The stress-strain curves show that the Q&P and 250 degrees C Q-DP treated samples exhibit the larger uniform elongation and the value of n calculated for samples is 0.109 and 0.101 respectively. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：129 / 135
页数：7
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