G115/T92异种钢焊接接头的显微组织及力学性能
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摘要
利用钨极氩弧焊(GTAW)和手工电弧焊(SMAW)工艺,选用E90S-G焊丝和E9015-G焊条为焊料,对G115/T92异种钢进行焊接,研究其焊接接头的显微组织及力学性能。结果表明:接头焊缝、热影响区及母材均为典型的回火马氏体组织,T92侧焊缝及熔合线附近分布有多边形的δ-铁素体,含量不高于0.3%。G115侧熔合区发现有较明显的W、Co、Mo、Cu元素稀释现象。显微硬度在紧邻焊缝的热影响区达到最大值,在不完全相变区(ICHAZ)达到最小值,且经过二次回火,母材硬度降低。接头室温及650℃高温强度与T92钢相当,低于G115钢;室温断口位于T92侧母材,高温断口位于T92侧不完全相变区。
Gas tungsten arc welding( GTAW) and shielded metal arc welding( SMAW) were used to weld G115/T92 dissimilar steel with welding wire E90 S-G and welding rod E9015-G as solder,and microstructure and mechanical properties of the welded joints were investigated. The results show that the microstructure of the welding seam,heat-affected zone( HAZ) and base metal of the joints is typical tempered martensite structure. The polygonal δ-ferrite is observed near the fusion line and welding seam on the T92 steel side,and the content is not higher than 0. 3%. Element dilution of W,Co,Mo and Cu is obviously observed in the fusion zone of the G115 steel side. The Vickers hardness reaches the maximum value in the HAZ next to the welded seam and the minimum value in the inter-critical heat-affected zone( ICHAZ). After secondary tempering,the hardness of the base metal decreases. The strength of the welded joints at room temperature and 650 ℃ is equal to that of the T92 steel and is lower than that of the G115 steel,and the fracture at room temperature is located on the T92 steel side,and the fracture at 650 ℃ is located in the ICHAZ on the T92 steel side.
Gas tungsten arc welding( GTAW) and shielded metal arc welding( SMAW) were used to weld G115/T92 dissimilar steel with welding wire E90 S-G and welding rod E9015-G as solder,and microstructure and mechanical properties of the welded joints were investigated. The results show that the microstructure of the welding seam,heat-affected zone( HAZ) and base metal of the joints is typical tempered martensite structure. The polygonal δ-ferrite is observed near the fusion line and welding seam on the T92 steel side,and the content is not higher than 0. 3%. Element dilution of W,Co,Mo and Cu is obviously observed in the fusion zone of the G115 steel side. The Vickers hardness reaches the maximum value in the HAZ next to the welded seam and the minimum value in the inter-critical heat-affected zone( ICHAZ). After secondary tempering,the hardness of the base metal decreases. The strength of the welded joints at room temperature and 650 ℃ is equal to that of the T92 steel and is lower than that of the G115 steel,and the fracture at room temperature is located on the T92 steel side,and the fracture at 650 ℃ is located in the ICHAZ on the T92 steel side.
引文
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[2]Abe F,Tabuchi M,Semba H,et al.Feasibility of MARBN steel for application to thick section boiler components in USC power plant at 650℃[C]//5th International Conference on Advances in Materials Technology for Fossil Power Plants,Marco Island,Florida,USA,2007:92-106.
[3]Liu Z,Bao H,Chen Z.G115 steel and its application for 600℃A-USC-PP[C]//8th International Conference on Advances in Materials Technology for Fossil Power Plants,Albufeira,Algarve,Portugal,2016,1011-1018.
[4]Iseda A,Yoshizawa M,Okada H,et al.Development of 9Cr ferritic steel tube and pipe SAVE12AD for advanced power boilers[J].The Thermal and Nuclear Power Generation Convention Collected Works,2016,12:49-55.
[5]谢锡善,于鸿垚,迟成宇,等.一种复合强化22/15铬镍型高强抗蚀奥氏体耐热钢:中国,CN 103643171 A[P].2014-03-19.
[6]Di Gianfrancesco A.Materials for ultra-super critical and advanced ultra-super critical power plants[M].Woodhead Publishing,2016.
[7]Yan P,Liu Z,Liu W,et al.Hot deformation behavior of a new 9%Cr heat resistant steel G115[J].Journal of Iron and Steel Research,International,2013,20(9):73-79.
[8]李海昭,梁军,徐连勇,等.循环正火处理对9Cr3W3Co钢组织及冲击韧性的影响[J].材料热处理学报,2017,38(10):67-71.LI Hai-zhao,LIANG Jun,XU Lian-yong,et al.Effect of cyclic normalization on microstructure and impact toughness of 9Cr3W3Co steel[J].Transactions of Materials and Heat Treatment,2017,38(10):67-71.
[9]Yan P,Liu Z,Bao H,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.
[10]李海昭,梁军,林万鹏,等.正火温度对G115钢组织及室温强度的影响[J].材料热处理学报,2018,39(1):71-76.LI Hai-zhao,LIANG Jun,LIN Wan-peng,et al.Effect of normalizing temperature on microstructure and room temperature strength of G115 steel[J].Transactions of Materials and Heat Treatment,2018,39(1):71-76.
[11]Yan P,Liu Z,Bao H,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.
[12]Yan P,Liu Z.Toughness evolution of 9Cr-3W-3Co martensitic heat resistant steel during long time aging[J].Materials Science and Engineering A,2016,650:290-294.
[13]Yan P,Liu Z,Bao H,et al.Effect of microstructural evolution on high-temperature strength of 9Cr-3W-3Co martensitic heat resistant steel under different aging conditions[J].Materials Science and Engineering:A,2013,588:22-28.
[14]胡小强,肖纳敏,罗兴宏,等.含W型10%Cr超超临界钢中δ-铁素体的微观结构及其对力学性能的影响[J].金属学报,2009,45(5):553-558.HU Xiao-qiang,XIAO Na-min,LUO Xing-hong,et al.Effects ofδ-ferrite on the microstructure and mechanical properties in a tungsten-alloyed 10%Cr ultra-super critical steel[J].Acta Metallurgica Sinica,2009,45(5):553-558.
[15]Francis J A,Mazur W,Bhadeshia H.Review type IV cracking in ferritic power plant steels[J].Materials Science and Technology,2006,22(12):1387-1395.
[16]Li S,Eliniyaz Z,Sun F,et al.Effect of thermo-mechanical treatment on microstructure and mechanical properties of P92 heat resistant steel[J].Materials Science and Engineering A,2013,559:882-888.
[17]王维斯,吴强.T92与Super304H异种钢焊接接头硬度异常分析及处理[J].金属功能材料,2017,24(1):44-48.WANG Wei-si,WU Qiang.Analysis and treatment of abnormal hardness on T92 and Super304H dissimilar steel welded joints[J].Metallic Functional Materials,2017,24(1):44-48.
[18]Kim M Y,Kwak S C,Choi I S,et al.High-temperature tensile and creep deformation of cross-weld specimens of weld joint between T92 martensitic and Super304H austenitic steels[J].Materials Characterization,2014,97:161-168.
[19]宋有明,陈国宏,余新海,等.T92/HR3C异种钢焊接接头高温拉伸变形及断裂行为[J].材料热处理学报,2012,33(2):72-78.SONG You-ming,CHEN Guo-hong,YU Xin-hai,et al.Tensile plastic deformation and fracture behavior of T92/HR3C dissimilar welded joints at high temperatures[J].Transactions of Materials and Heat Treatment,2012,33(2):72-78.