Thermal stability of ultra-low-carbon copper-bearing age-hardening steel

被引：0

作者：

机构：

[1] Liu, Yi-Zhi

[2] Yang, Cai-Fu

[3] Chai, Feng

[4] Zhang, Yong-Quan

[5] Su, Hang

来源：

Chai, F. (chaifeng@nercast.com) | 1600年 / Editorial Office of Transactions of Materials, 18 Xueqing Road, Beijing, 100083, China卷 / 34期

关键词：

Cu precipitates - High hardness - M/A island - Matrix microstructure - Reheat temperatures - Strength and toughness - XRD;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Microstructure and mechamical properties of a ultra-low-carbon copper-bearing age-hardening steel under reheated treatment between 400°C to 800°C were investigated. OM, SEM, TEM and XRD were used to characterize microstructure and Ε-Cu precipitates of the tested steel under reheat treatment at different temperatures. Strength and toughness of tested steel do not decrease significantly when reheat temperature below 650°C, which means the tested steel exhibits excellent thermal stability. Due to recovery of matrix microstructure and coalescence of Ε-Cu precipitates, yield strength of the tested steel decreases significantly when reheat temperature above 650°C. Due to appearance of high hardness M/A island, toughness of the tested steel decreases markedly when reheat temperature above 700°C. The results indicate that recovery of matrix microstructure, size and quantity of Ε-Cu precipitates and M/A island are mainly facters affecting thermal stability of the ultra-low-carbon copper-bearing age-hardening steel.

引用