Dual Phase Heat Treatment of Low-Alloy Steel

• Published in: Journal of iron and steel research, international Vol. 12; no. 5; pp. 47 - 51
• Main Authors: Han, Jian-Min, Cui, Shi-Hai, Li, Wei-Jing, Ma, Xiao-Yan
• Format: Journal Article
• Language: English
• Published: Beijing Jiaotong University, Beijing 100044, China 01.09.2005
• Subjects: 合金钢; 微观结构; 机械装置; 热处理; microstructure; heat treatment; low-alloy steel; optimization; dual phase
• ISSN: 1006-706X; 2210-3988

Dual phase heat treatment is an economical and effective way for improving the properties of low carbon steels and low-alloy steel materials. In this paper, the microstructures and mechanical properties of 20MnSi steel treated by different dual phase heat treatment have been studied. The results show that dual phase heat treatment with pre-quenching technique and then heating from room temperature to the critical zone can achieve finer and more homogeneous microstructure than that with pre-normalizing technique and then cooling from austenite zone to the critical zone. Among all factors affecting dual phase heat treatment, quenching temperature at the critical zone and tempering temperature play an important part in mechanical properties. Using proper dual phase heat treatment technique with computer optimized parameters, the yield strength, the elongation and impact toughness of 20MnSi can reach 860 MPa, 16% and 207 MPa respectively.