陈重毅;李永清;陈正宗;麻永林;邢淑清;

• 1:内蒙古科技大学材料与冶金学院

• 2:内蒙古北方重工业集团有限公司技术中心

• 3:钢铁研究总院特殊钢研究所

•  

摘要(Abstract)：                

通过热模拟法得到了G115钢在不同焊接峰值温度下的热影响区,分析了热影响区相转变规律,利用光学显微镜、扫描电镜观察了热影响区组织形貌,结果表明:G115钢粗晶区和细晶区的组织为板条马氏体,临界相变区为细小板条马氏体和高温回火马氏体,亚临界相变区为回火马氏体,高温回火组织的形成会降低临界相变区的综合性能.由于临界相变区形成的奥氏体内化学成分、均匀性及稳定性与母材存在较大的差异,导致在冷却过程中马氏体转变点有所提高,M_s由380℃提高到441℃.粗晶区和细晶区产生了强化效果,临界相变区和亚临界相变区产生了软化效果,软化效果与高温回火效应有密切联系.

关键词(KeyWords)：                    金属材料;G115钢;焊接热模拟;相转变;显微组织

基金项目(Foundation):                    国家重点研发计划基金资助项目(2017YFB0305202);; 内蒙古自治区自然科学基金资助项目(2016MS0510)

作者(Author):                    陈重毅;李永清;陈正宗;麻永林;邢淑清;

Email:                                    

参考文献(References)：

• [1] TABUCHI M,HONGO H,ABE F.Creep strength of dissimilar welded joints using High B-9Cr steel for advanced USC boiler[J].Metallurgical and Materials Transactions A,2014,45A:5068-5075.

• [2] YAN P,LIU Z D,BAO H S,et al.Effect of normalizing temperature on the strength of 9Cr-3W-3Co martensitic heat resistant steel[J].Materials Science and Engineering A,2014,597:148-156.

• [3] YAN P ,LIU Z D,BAO H S,et al.Effect of tempering temperature on the toughness of 9Cr-3W-3Co martensitic heat resistant steel[J].Materials and Design,2014,54:874-879.

• [4] XIAO B,XU L Y,TANGZ X,et al.A physical-based yield strength model for the microstructural degradation of G115 steel during long-term creep[J].Materials Characterization,2014,96:213-224.

• [5] XIAO B,XU L Y,TANG Z X,et al.A physical-based yield strength model for the microstructural degradation of G115 steel during long-term creep[J].Materials Science and Engineering A,2019,747:161-176.

• [6] MAYR P,CERJAK H.The impact of welding on the creep properties of advanced 9%～12% Cr steels[J].Transactions of the Indian Institute of Metals,2010,63(2-3):131-136.

• [7] SAWADA K,BAUER M,KAUFFMANN F,et al.Microstructural change of 9% Cr-welded joints after long-term creep[J].Materials Science and Engineering A,2010,527:1417-1426.

• [8] ALBERT S K,KONDO M,TABUCHI M,et al.Improving the creep properties of 9Cr-3W-3Co-NbV steels and their weld joints by the addition of boron[J].Metallurgical and Materials Transactions A,2005 36A:333-343.

• [9] LIU Y,TSUKAMOTO S,SAWADA K,et al.Precipitation behavior in the heat-affected zone of boron-added 9Cr-3W-3Co steel during post-weld heat treatment and creep deformation[J].Metallurgical and Materials Transactions A,2015,46A:1843-1854.

• [10] MATSUNAGA T,HONGO H,TABUCHI M,et al.Suppression of grain refinement in heat-affected zone of 9Cr-3W-3Co-VNb steels[J].Materials Science and Engineering A,2016,655:168-174.

• [11] DI X J,TONG M,LI C N,et al.Microstructural evolution and its influence on toughness in simulated inter-critical heat affected zone of large thickness bainitic steel[J].Materials Science and Engineering A,2019,743:67-76.

• [12] MA H C,LIU Z Y,DU C W,et al.Comparative study of the SCC behavior of E690 steel and simulated HAZ microstructures in a SO2-polluted marine atmosphere[J].Materials Science and Engineering A,2016,650:93-101.