Effect of boron on intragranular ferrite nucleation mechanism in coarse grain heat-affected zone of high-nitrogen steel

被引：18
|
作者：
Shi, Zhongran [1 ,2 ]
Wang, Jiaji [3 ]
Chai, Xiyang [1 ]
Wang, Shihong [1 ]
Chen, Gang [1 ]
Wang, Ruizhen [1 ]
机构：
[1] Cent Iron & Steel Res Inst, Dept Struct Steels, Beijing 100081, Peoples R China
[2] Yantai CISRI Marine Equipment Mat Appl Technol Co, Yantai 265600, Peoples R China
[3] State Key Lab Met Mat Marine Equipment & Applicat, Anshan 114000, Peoples R China
来源：
MATERIALS LETTERS | 2020年 / 258卷
基金：
国家重点研发计划;
关键词：
Welding; High-nitrogen steel; Boron; CGHAZ; Microstructure; TI; BOUNDARIES; AUSTENITE;
D O I：
10.1016/j.matlet.2019.126819
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effect of boron on intragranular ferrite (IGF) nucleation mechanism in the simulated coarse grain heated-affected zone (CGHAZ) of a high-nitrogen steel was investigated. When boron (B) was added to the steel, the ferrite transformation temperature increased from 775 degrees C to 800 degrees C and the amount of polygonal ferrite increased from 63.2% to 78.6%. Consequently, the ductile-to-brittle transition temperature decreased from -30 degrees C to -50 degrees C. (Ti,V)(C,N)-MnS-BN, MnS-BN, Al2O3-MnS-BN, and BN served as IGF nucleation sites. The core of the complex precipitates was formed by undissolved (Ti,V)(C,N)-MnS, Al2O3-MnS, and MnS, with a BN cap formed on the undissolved precipitates, which increased the IGF nucleation potency. (C) 2019 Elsevier B.V. All rights reserved.
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页数：5
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