[1]李 东,尹立孟,耿燕飞,等.t8/5对X90管线钢焊接热影响区细晶区显微组织的影响[J].焊管,2016,39(3):1-4.[doi:10.19291/j.cnki.1001-3938.2016.03.001]
 LI Dong,YIN Limeng,GENG Yanfei,et al.Influence of t8/5 on the Microstructure in HAZ Fine Grain Zone of X90 Pipeline Steel[J].,2016,39(3):1-4.[doi:10.19291/j.cnki.1001-3938.2016.03.001]
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t8/5对X90管线钢焊接热影响区细晶区显微组织的影响
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《焊管》[ISSN:1001-3938/CN:61-1160/TE]

卷:
39
期数:
2016年第3期
页码:
1-4
栏目:
试验与研究
出版日期:
2016-03-28

文章信息/Info

Title:
Influence of t8/5 on the Microstructure in HAZ Fine Grain Zone of X90 Pipeline Steel
文章编号:
10.19291/j.cnki.1001-3938.2016.03.001
作者:
李 东1尹立孟1耿燕飞1王学军2蒋 勇3王 刚1
1. 重庆科技学院冶金与材料工程学院,重庆 401331;
2. 四川石油天然气建设工程有限责任公司,成都 610041;
3. 四川大西洋焊接材料股份有限公司,四川 自贡 643000
Author(s):
LI Dong1YIN Limeng1GENG Yanfei1WANG Xuejun2JIANG Yong3WANG Gang1
关键词:
焊接X90管线钢焊接热影响区t8/5细晶区显微组织
Keywords:
welding X90 pipeline steelwelding HAZt8/5fine grain zone microstructure
分类号:
TG142.1
DOI:
10.19291/j.cnki.1001-3938.2016.03.001
文献标志码:
A
摘要:
为了研究焊接冶金与热循环过程对X90管线钢焊接热影响区细晶区显微组织的影响,采用淬火变形膨胀仪模拟了不同t8/5条件下X90管线钢热影响区细晶区的热循环过程,并在光学显微镜和扫描电子显微镜不观察了其显微组织随t8/5不同而变化的情况。研究结果表明,当t8/5<6 s时,会获得粒状贝氏体、贝氏体铁素体和板条马氏体的混合组织;当t8/5>12 s时,组织以多边形铁素体为主,并随着t8/5的减小,会先后出现珠光体和粒状贝氏体;当t8/5控制在6~12 s时,细晶区组织主要为性能良好的贝氏体组织和少量准多边形铁素体。为获得综合性能优异的焊接接头,冷却过程中焊接热影响区细晶区的t8/5应控制在6~12 s更为合适。
Abstract:
In order to study the influence of the welding metallurgy and heat cycle process on microstructure in HAZ fine grain zone of X90 pipeline steel, the heat cycle process was simulated by quenching deformation expansion instrument under different t8/5 conditions, and the microstructure change was observed by the optical microscope(OM) and scanning electron microscopy(SEM). The results showed that a mixed microstructure containing granular bainite (GB),bainite ferrite (BF) and lath martensite(LM) appear under the condition of a t8/5 less than 6s;the microstructure was predominantly polygon ferrite(PF)when t8/5 is more than 12s,and with the decrease of the t8/5,pearlite(P) and granular bainite(GB) will appear successively. Only when the t8/5 was limited in 6~12 s,the microstructure of fine grain zone was bainite (B) dominantly and is accompanied by a small quantity of quasi-polygonal ferrite(QF). In order to obtain excellent comprehensive properties of welded joint, the t8/5 in HAZ fine grain zone during the cooling process should be controlled in 6~12 s.

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备注/Memo

备注/Memo:
收稿日期:2015-12-29
基金项目:重庆市前沿与应用基础研究项目(cstc2014jcyjA40009、cstc2015jcyjA50017);重庆市研究生科研创新项目(CYS15227)。
作者简介:李东(1992—),男,硕士研究生,主要从事高性能管线钢焊接与力学可靠性评价工作。
更新日期/Last Update: