Contribution of Grain Boundary Misorientation to Intragranular Globular Austenite Reversion and Resultant in Grain Refinement in a High-Strength Low-Alloy Steel

X.L. Wang, Z. Wang, A. Huang, J.L. Wang, X. Li, S. Subramanian, C. Shang, Z. Xie
{"title":"Contribution of Grain Boundary Misorientation to Intragranular Globular Austenite Reversion and Resultant in Grain Refinement in a High-Strength Low-Alloy Steel","authors":"X.L. Wang, Z. Wang, A. Huang, J.L. Wang, X. Li, S. Subramanian, C. Shang, Z. Xie","doi":"10.2139/ssrn.3538765","DOIUrl":null,"url":null,"abstract":"Abstract This paper elucidates the determining role of grain boundary types/misorientations on formation of intragranular globular austenite, which has random orientation or large deviation from the parent austenite, in a high-strength low-alloy bainitic steel during reaustenitization. Results revealed that within the parent austenite with lath bainite, reverted austenite with random orientation or large deviation from the parent austenite can nucleate at the packet and block boundaries with high misorientations, and rapidly evolve to become globular austenite with increase of temperature, making a significant contribution in final austenite grain refinement. While in granular bainite, the low misoriented boundaries belonging to the same Bain group are the preferred nucleation sites for the reverted austenite, which is detrimental to the formation of intragranular globular austenite. In addition, the precipitation mode of cementite is different in the reverse process, that is, cementite is precipitated from the matrix of lath bainite, but it is precipitated from retained austenite or martensite/austenite (M/A) particles in granular bainite, which will also lead to the different or consistent variant orientation of reverted austenite and matrix. Therefore, the final austenite grain refinement in initial granular bainite was mainly due to the formation of intergranular globular reverted austenite, and the refining effect is much lower than that of lath bainite.","PeriodicalId":438337,"journal":{"name":"EngRN: Metals & Alloys (Topic)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2020-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"10","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"EngRN: Metals & Alloys (Topic)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.2139/ssrn.3538765","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 10

Abstract

Abstract This paper elucidates the determining role of grain boundary types/misorientations on formation of intragranular globular austenite, which has random orientation or large deviation from the parent austenite, in a high-strength low-alloy bainitic steel during reaustenitization. Results revealed that within the parent austenite with lath bainite, reverted austenite with random orientation or large deviation from the parent austenite can nucleate at the packet and block boundaries with high misorientations, and rapidly evolve to become globular austenite with increase of temperature, making a significant contribution in final austenite grain refinement. While in granular bainite, the low misoriented boundaries belonging to the same Bain group are the preferred nucleation sites for the reverted austenite, which is detrimental to the formation of intragranular globular austenite. In addition, the precipitation mode of cementite is different in the reverse process, that is, cementite is precipitated from the matrix of lath bainite, but it is precipitated from retained austenite or martensite/austenite (M/A) particles in granular bainite, which will also lead to the different or consistent variant orientation of reverted austenite and matrix. Therefore, the final austenite grain refinement in initial granular bainite was mainly due to the formation of intergranular globular reverted austenite, and the refining effect is much lower than that of lath bainite.
高强度低合金钢晶界取向偏差对晶内球状奥氏体逆转的影响及其导致的晶粒细化
摘要本文阐明了高强度低合金贝氏体钢在再奥氏体化过程中晶界类型/取向偏差对晶内球状奥氏体形成的决定作用,这种球状奥氏体取向随机或与母奥氏体偏差较大。结果表明:在含板条贝氏体的母奥氏体内部,取向随机或与母奥氏体偏差较大的逆转奥氏体在取向偏差较大的包状和块状边界处形核,并随着温度的升高迅速演化为球状奥氏体,对最终的奥氏体晶粒细化有重要贡献。而在粒状贝氏体中,属于同一Bain群的低错取向边界是奥氏体恢复的首选形核位置,这不利于晶内球状奥氏体的形成。另外,在逆向过程中,渗碳体的析出方式也不同,即渗碳体是从板条贝氏体基体中析出的,而渗碳体是从粒状贝氏体中残留的奥氏体或马氏体/奥氏体(M/A)颗粒中析出的,这也会导致还原奥氏体与基体取向不同或一致的变向。因此,在初始粒状贝氏体中,最终的奥氏体晶粒细化主要是由于晶间球状还原奥氏体的形成,其细化效果远低于条状贝氏体。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
自引率
0.00%
发文量
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信