X70管线钢焊接接头调质处理后的低温冲击韧性
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摘要
分别采用手工焊条电弧焊和单丝埋弧焊工艺焊接X70管线钢,对其焊接接头进行调质处理,研究焊接方法对调质处理后X70管线钢焊接接头力学性能、组织形貌、大角度晶界密度等的影响。结果表明:手工焊条电弧焊焊缝中心和热影响区的冲击吸收能量远高于单丝埋弧焊焊缝;单丝埋弧焊焊缝和热影响区组织中的粗大贝氏体板条束、大块状铁素体是降低其冲击吸收能量的主要原因,手工焊条电弧焊焊缝组织中的细小且按不同位向错综排列的针状铁素体以及较高的大角度晶界密度是提高其冲击吸收能量的主要原因。
X70 pipeline steel was welded by shielded metal arc welding( SMAW) and single wire submerged arc welding( SAW),and the effect of welding method on mechanical properties,microstructure and high-angle grain boundary density of welded joint of the X70 pipeline steel after hardening and tempering was investigated. The results show that the impact absorption energy of welded seam center and heat affected zone( HAZ) of the SMAW welded joint is much higher than that of single wire SAW welded seam. The coarse bainite lath bundles and massive ferrite in the microstructure of single wire SAW welded seam and HAZ are the main reasons for decreasing the impact absorption energy. The fine acicular ferrite arranged in different direction in the SMAW welded seam and the high density of highangle grain boundary are the main reasons for increasing the impact absorption energy.
X70 pipeline steel was welded by shielded metal arc welding( SMAW) and single wire submerged arc welding( SAW),and the effect of welding method on mechanical properties,microstructure and high-angle grain boundary density of welded joint of the X70 pipeline steel after hardening and tempering was investigated. The results show that the impact absorption energy of welded seam center and heat affected zone( HAZ) of the SMAW welded joint is much higher than that of single wire SAW welded seam. The coarse bainite lath bundles and massive ferrite in the microstructure of single wire SAW welded seam and HAZ are the main reasons for decreasing the impact absorption energy. The fine acicular ferrite arranged in different direction in the SMAW welded seam and the high density of highangle grain boundary are the main reasons for increasing the impact absorption energy.
引文
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[2]张小立,刘迎来,冯耀荣,等.高钢级管线钢二次加热后韧性指标变化规律及其与组织关系探讨[J].材料开发与应用,2008,23(1):1-4.ZHANG Xiao-li,LIU Ying-lai,FENG Yao-rong,et al.Study on the the relationship of the change index of toughness with the the issue of pipeline steel after high heating[J].Development and Application of Materials,2008,23(1):1-4.
[3]张小立,冯强,刘迎来,等.二次加热对高钢级管线钢韧性及其组织的影响[J].材料热处理学报,2008,29(6):66-69.ZHANG Xiao-li,FENG Qiang,LIU Ying-lai,et al.Effect of reheating on toughness index and microstructure of high grade pipeline steels[J].Transactions of Materials and Heat Treatment,2008,29(6):66-69.
[4]何莹,张卫锋.不同回火温度对X70管线钢管焊缝组织性能的影响[J].焊管,2017,40(5):36-40.HE Ying,ZHANG Wei-feng.Influence of different tempering temperatures on X70 line pipe weld microstructure performance[J].Welded Pipe and Tube,2017,40(5):36-40.
[5]顾亚光,张荣胜.X70级HFW焊管在线中频感应热处理工艺研究[J].焊管,2017,40(4):53-56.GU Ya-guang,ZHANG Rong-sheng.X70 grade HFW pipe on-line mid-frequency induction heat treatment process research[J].Welded Pipe and Tube,2017,40(4):53-56.
[6]杨秀芝.X70管线钢热挤压工艺下再结晶的行为[J].工业建筑,2017,35(5):54-57.YANG Xiu-zhi.He recrystallization of X70 pipeline steel under hot extrusion process[J].Industrial Construction,2017,35(5):54-57.
[7]赵春,霍春勇,虞毅,等.回火温度对X70管线钢感应加热弯管组织性能的影响[J].热加工工艺,2007,36(22):63-65.ZHAO Chun,HUN Chun-yong,YU Yi,et al.Effect of tempering temperature on structure and property of X70 pipeline steel after induction bends[J].Hot Working Technology,2007,36(22):63-65.
[8]Bouzid,Maamache,Mabrouk,et al.Characterization of HSLA X70 welded pipeline steel subjected to successive repairs[J].Acta Metallurgica Sinica(English Letters),2016,29(6):568-576.
[9]李硕,李玉卓,王永胜,等.回火工艺对X70热煨弯管用母管组织和性能的影响[J].热加工工艺,2016,45(2):225-226.LI Shuo,LI Yu-zhuo,WANG Yong-sheng,et al.Effect of tempering on microstructure and mechanical properties of mother pipe of X70 induction bend[J].Hot Working Technology,2016,45(2):225-226.
[10]杨玮玮,彭立山,李国鹏,等.感应加热弯管热处理前后热影响区组织和性能的变化[J].焊管,2015(6):58-62.YANG Wei-wei,PENG Li-shan,LI Guo-peng,et al.The change of heat affected zone(HAZ)microstructure and performance of induction heating bend pipes before and after heat treatment[J].Welded Pipe and Tube,2015(6):58-62.
[11]刘静.热处理工艺对高强度管线钢组织性能的影响[J].中国石油和化工标准与质量,2011,31(9):263-268.LIU Jing.Effect of heat treatment process on microstructure and properties of high strength pipeline[J].China Petroleum and Chemical Standard and Quality,2011,31(9):263-268.
[12]王晓香,李延丰,付彦宏,等.X80级管线钢管和感应加热弯管的开发[J].焊管,2009,32(6):30-35.WANG Xiao-xiang,LI Yan-feng,FU Yan-hong.et al.Development of X80 grade pipeline steelpipe and induction heating bend[J].Welded Pipe and Tube,2009,32(6):30-35.
[13]刘宇,冯斌,李烨铮,等.加热温度对X70大变形管线钢热煨弯管组织的影响[J].热加工工艺,2011,40(21):22-28.LIU Yu,FENG Bin,LI Ye-zheng,et al.Effects of heatig temperature on microstructure of induction bends form X70 pipeline steel with excellent deformation[J].Hot Working Technology,2011,40(21):22-28.
[14]Gregg J M.Bainite nucleation from mineral surfaces[J].Acta Metallurgica Et Materialia,1994,42(10):3321-3330.
[15]Shim J H,Oh Y J,Suh J Y,et al.Ferrite nucleation potency of non-metallic inclusions in medium carbon steels[J].Acta Materialia,2001,49(12):2115-2122.