Effects of Si on the stability of retained austenite and temper embrittlement of ultrahigh strength steels |
| |
| Authors: | Li-jun Wang Qing-wu Cai Hui-bin Wu Wei Yu |
| |
| Affiliation: | (1) State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Shanxi, 710049, P.R. China;(2) Technical Center, Maanshan Iron & Steel Co., Ltd., Anhui, 243000, P.R. China |
| |
| Abstract: | Effects of silicon (Si) content on the stability of retained austenite and temper embrittlement of ultrahigh strength steels
were investigated using X-ray diffraction (XRD), transmission electron microscopy (TEM), and other experimental methods. The
results show that Si can suppress temper embrittlement, improve temper resistance, and hinder the decomposition of retained
austenite. Reversed austenite appears gradually with the increase of Si content during tempering. Si has a significant effect
on enhancing carbon (C) partitioning and improving the stability of retained austenite. Si and C atoms are mutually exclusive
in lath bainite, while they attract each other in austenite. ɛ-carbides are found in 1.8wt% Si steel tempered at 250°C, and
they get coarsened obviously when tempered at 400°C, leading to temper embrittlement. Not ɛ-carbides but acicular or lath
carbides lead to temper embrittlement in 0.4wt% Si steel, which can be inferred as cementites and composite compounds. Temper
embrittlement is closely related to the decomposition of retained austenite and the formation of reversed austenite. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
| 点击此处可从《矿物冶金与材料学报》浏览原始摘要信息 |
|
点击此处可从《矿物冶金与材料学报》下载全文 |
|
