SA508-3钢内部闭合性裂纹缺陷高温焊合过程分析
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摘要
目的针对钢中存在闭合性内部裂纹的问题,研究闭合性裂纹缺陷的修复方法。方法采用实验及数字模拟分析方法,研究了SA508-3钢闭合性裂纹缺陷在高温小塑性变形下的焊合过程。结果 SA508-3钢在奥氏体相区的高温小塑性变形焊合是以薄膜破裂-再结晶-扩散的方式进行,在变形量为5%的情况下,实验温度为1000℃以上时,试样基本焊合,实验温度低于950℃以下时,试样未焊合。结论采用数字模拟表明,在不同温度下,焊缝区域等效应变不随温度变化而变化,而等效应力的变化与材料的峰值应力相关。
The paper aims to solve inner closed crack defect in steel and study methods for repairing inner closed crack defects. The bonding process of SA508-4 steel inner closed crack defect at high temperature with small plastic deformation was researched through experimental and numerical simulation methods. Experimental results showed that the small plastic deformation of SA508-4 steel under high temperature occurred through film crack, recrystallization and spread. The closed crack of SA508-3 steel achieved bonding under temperature ≥1000 ℃, deformation ≥5%, but the lack of bonding was existed under temperature ≤950 ℃. Numerical simulation shows that the equivalent strain in bonding area does not change with temperature, whereas the change of equivalent strain is related to metal's peak stress.
The paper aims to solve inner closed crack defect in steel and study methods for repairing inner closed crack defects. The bonding process of SA508-4 steel inner closed crack defect at high temperature with small plastic deformation was researched through experimental and numerical simulation methods. Experimental results showed that the small plastic deformation of SA508-4 steel under high temperature occurred through film crack, recrystallization and spread. The closed crack of SA508-3 steel achieved bonding under temperature ≥1000 ℃, deformation ≥5%, but the lack of bonding was existed under temperature ≤950 ℃. Numerical simulation shows that the equivalent strain in bonding area does not change with temperature, whereas the change of equivalent strain is related to metal's peak stress.
引文
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[2]江旭东,黄俊,周琦,等.铝-铜异种材料对接搅拌摩擦焊温度场数值模拟[J].焊接学报,2018,39(3):16-20.JIANG Xu-dong,HUANG Jun,ZHOU Qi,et al.Numerical Simulation of the Temperature Field for Butt Friction Stir Welding of Dissimilar 6061-T6 and T2 Alloys[J].Transactions of the China Welding Institution,2018,39(3):16-20.
[3]冯迪,张新明,孙峰,等.铝合金空心型材挤压焊合问题的研究进展[J].材料导报,2013,27(19):6-9.FENG Di,ZHANG Xin-ming,SUN Feng,et al.Research and Progress in Weld Seams of Aluminum Alloy Hollow Profile Extrusion[J].Materials Review,2013,27(19):6-9.
[4]徐斌,孙明月,李殿中.锻造过程中钢锭内部孔洞型缺陷闭合规律研究[J].金属学报,2012,48(10):1194-1200.XU Bin,SUN Ming-yue,LI Dian-zhong.The Void Close Behavior of Large Ingots during Hot Forging[J].Acta Metalillurgica Sinica,2012,48(10):1194-1200.
[5]刘丽娟.大锻件材料内部空洞型缺陷高温焊合过程的研究[D].上海:上海交通大学,2010.LIU Li-juan.Study on the Bonding Process of Inner Voil Defects in Heavy Forging at High Temperature[D].Shanghai:Shanghai Jiao Tong University,2010.
[6]邓德伟,于静,刘倩倩,等.裂纹止裂愈合技术发展现状及展望[J].机械工程学报,2016,52(7):122-132.DENG De-wei,YU Jing,LIU Qian-qian,et al.States and Prospects of Crack Arrest and Healing Technology[J].Journal of Mechanical Engineering,2016,52(7):122-132.
[7]王艳松,李文亚,杨夏炜,等.冷压焊界面结合机理与结合强度研究现状[J].材料工程,2016,44(4):119-130.WANG Yan-song,LI Wen-ya,YANG Xia-wei,et al.Research Status on Interface Bonding Mechanisms and Strength of Cold Pressure Welding[J].Journal of Materials Engineering,2016,44(4):119-130.
[8]黄华贵,杜凤山,许志强.影响大锻件内部孔隙性缺陷扩散焊合的因素[J].钢铁研究学报,2007,19(11):55-57.HUANG Hua-gui,DU Feng-shan,XU Zhi-qiang.Factors Affecting Diffusion Welding of Internal Porosity Defects in Heavy Forgings[J].Journal of Iron and Steel Research,2007,19(11):55-57.
[9]李凯,郭鸿镇,赵张龙,等.变形量对Ti2AlNb/Ti60双合金焊接接头组织和力学性能的影响[J].热加工工艺,2014,43(9):1-5.LI Kai,GUO Hong-zhen,ZHAO Zhang-long,et al.Effects of Deformation Degree on Microstructure and Mechanical Properties of Welded Joint of Ti2AlNb/Ti60Dual Alloys[J].Hot Working Technology,2014,43(9):1-5.
[10]刘丰,王帅伟,陈雷,等.大口径厚壁无缝钢管孔隙性缺陷的焊合问题[J].塑性工程学报,2014,21(4):102-108.LIU Feng,WANG Shuai-wei,CHEN Lei,et al.Research on the Inner Crack Healing of Large-sized Seamless Steel Tube[J].Journal of Plasticity Engineering,2014,21(4):102-108.
[11]王祖唐,刘庄,任猛.大钢锭锻造时内部孔洞性缺陷压合的试验研究[J].大型铸锻件,1987,1(1):1-8.WANG Zu-tang,LIU Zhuang,REN Meng.Experimental Study on Pressing of Internal Void Defects in Large Ingot Forging[J].Heavy Castings and Forgings,1987,1(1):1-8.
[12]阚盈,程明,张士宏.大锻件孔隙性缺陷焊合规律[J].塑性工程学报,2011,18(3):9-13.KAN Ying,CHENG Ming,ZHANG Shi-hong.Bonding Rules of Inner Crack in Large Forgings[J].Journal of Plasticity Engineering,2011,18(3):9-13.
[13]TANAKA M,ONO S,TSUNENO M,et al.An Analysis of Void Crushing during Flat Die Free Forging[J].Advanced Technology of Plasticity,1987(2):1035-1042.
[14]ROBERTS S M,KUSIAK J,LIU Y L,et al.Prediction of Damage Evolution in Forged Aluminum Metal Matrix Composites Using a Neural Network Approach[J].Journal of Materials Processing Technology,1998(80/81):507-512.
[15]DERBY B,WALLACH E R.Diffusion Bonding:Development of Theoretical Model[J].Metal Science,1984,18(9):427-431.