Influence of Microstructure in the Heat-Affected-Zone on the Reheat Cracking Susceptibility

Mitsuru Nakamura, T. Enjo, Y. Kikuchi
{"title":"Influence of Microstructure in the Heat-Affected-Zone on the Reheat Cracking Susceptibility","authors":"Mitsuru Nakamura, T. Enjo, Y. Kikuchi","doi":"10.2207/QJJWS.3.560","DOIUrl":null,"url":null,"abstract":"Influence of microstructure in the Heat-Affected-Zone on the reheat cracking susceptibility was studied.The reheat cracking tests on H.T. 80 steel were carried out by means of ring type specimens and three point bending test. Influence of microstructure of synthetic H.A.Z. at high temperature on the reheat treatment process were investigated by high temperature hardness measurements, X-ray analysis and scanning electron microscopic observations. The results are summarized as follows. 1) The reheat cracking's critical stress of Martensite structure specimens (Water Quenched) were generally double than that of Bainite and Ferrite structure specimens (Air Cooled). But, the reheat cracking susceptibility of A.C. specimens were little by the difference of forms in microstructure. 2) The reheat cracking susceptibility were estimated by the relation of the deformability of a material and the precipitate of alloying carbides. Accordingly, alloying carbides of A.C. specimens precipitated to M3C type carbides during cooling process of synthetic H.A.Z., but that of W.Q. specimens precipitated to M3C type carbides as well as A.C specimens and M2C type carbides during reheat treatment process. W.Q. specimens of the lower reheat' cracking susceptibility are affected mainly by the precipitate of M2C type carbides in the matrix. 3) It is seemed that the precipitation of M2C and M3C type carbides during reheat treatment process from W.Q. specimens decreased the alloying elements concentration in the matrix, and showed a good deformability of a material. As a consequence, the reheat cracking susceptibility of W.Q. specimens were lower than that of A.C. specimens.","PeriodicalId":273687,"journal":{"name":"Transactions of the Japan Welding Society","volume":"8 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"6","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Transactions of the Japan Welding Society","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.2207/QJJWS.3.560","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 6

Abstract

Influence of microstructure in the Heat-Affected-Zone on the reheat cracking susceptibility was studied.The reheat cracking tests on H.T. 80 steel were carried out by means of ring type specimens and three point bending test. Influence of microstructure of synthetic H.A.Z. at high temperature on the reheat treatment process were investigated by high temperature hardness measurements, X-ray analysis and scanning electron microscopic observations. The results are summarized as follows. 1) The reheat cracking's critical stress of Martensite structure specimens (Water Quenched) were generally double than that of Bainite and Ferrite structure specimens (Air Cooled). But, the reheat cracking susceptibility of A.C. specimens were little by the difference of forms in microstructure. 2) The reheat cracking susceptibility were estimated by the relation of the deformability of a material and the precipitate of alloying carbides. Accordingly, alloying carbides of A.C. specimens precipitated to M3C type carbides during cooling process of synthetic H.A.Z., but that of W.Q. specimens precipitated to M3C type carbides as well as A.C specimens and M2C type carbides during reheat treatment process. W.Q. specimens of the lower reheat' cracking susceptibility are affected mainly by the precipitate of M2C type carbides in the matrix. 3) It is seemed that the precipitation of M2C and M3C type carbides during reheat treatment process from W.Q. specimens decreased the alloying elements concentration in the matrix, and showed a good deformability of a material. As a consequence, the reheat cracking susceptibility of W.Q. specimens were lower than that of A.C. specimens.
热影响区组织对再热开裂敏感性的影响
研究了热影响区组织对再热开裂敏感性的影响。采用环型试样和三点弯曲试验对ht80钢进行了再热开裂试验。通过高温硬度测量、x射线分析和扫描电镜观察,研究了高温下合成的高强激光合金的显微组织对再热处理过程的影响。结果总结如下:1)马氏体组织试样(水淬)的再热开裂临界应力一般是贝氏体和铁素体组织试样(风冷)的两倍。但由于组织形态的差异,交流试样的再热开裂敏感性差异不大。2)根据材料的变形性能与合金碳化物析出物的关系,估计了材料的再热开裂敏感性。因此,在冷却过程中,交流试样的合金碳化物析出为M3C型碳化物,而在再热处理过程中,W.Q.试样的合金碳化物析出为M3C型碳化物,交流试样和M2C型碳化物析出。W.Q.试样的低再热开裂敏感性主要受基体中M2C型碳化物析出的影响。3) wq试样在再热处理过程中析出M2C和M3C型碳化物,降低了基体中合金元素的浓度,表现出良好的材料变形性能。结果表明,高压试样的再热开裂敏感性低于交流电试样。
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