奥氏体化温度对纳米贝氏体钢力学性能的影响

Effect of Austenitising Temperature on Mechanical Properties of Nanostructured Bainitic Steel.

作者信息

Zhao Jing, Li Jiemin, Ji Honghong, Wang Tiansheng

机构信息

State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China.

National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao 066004, China.

出版信息

Materials (Basel). 2017 Jul 28;10(8):874. doi: 10.3390/ma10080874.

DOI:10.3390/ma10080874

PMID:28773233

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5578240/

Abstract

Nanostructured bainite was obtained in high-carbon Si-Al-rich steel by low-temperature (220-260 °C) isothermal transformation after austenitisation at different temperatures (900 °C, 1000 °C, and 1150 °C). Improved strength-ductility-toughness balance was achieved in the nanostructured bainitic steel austenitised at low temperatures (900 °C and 1000 °C). Increasing the austenitising temperature not only coarsened prior austenite grains and bainite packets, but also increased the size and fraction of blocky retained austenite. High austenitising temperature (1150 °C) remarkably decreased ductility and impact toughness, but had a small effect on strength and hardness.

摘要

通过在不同温度（900℃、1000℃和1150℃）下进行奥氏体化后，于低温（220 - 260℃）等温转变，在高碳富硅铝钢中获得了纳米结构贝氏体。在低温（900℃和1000℃）奥氏体化的纳米结构贝氏体钢中实现了强度 - 延展性 - 韧性平衡的改善。提高奥氏体化温度不仅会使先共析奥氏体晶粒和贝氏体束粗化，还会增加块状残余奥氏体的尺寸和体积分数。高奥氏体化温度（1150℃）显著降低了延展性和冲击韧性，但对强度和硬度影响较小。