煤矿机械用Q690高强钢抗裂性研究
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摘要
对煤矿机械用Q690高强钢,采用其配套焊丝(GHS75M)进行抗裂性试验,并测定了焊丝熔敷金属扩散氢逸出特性,研究了焊缝金属残余扩散氢对试验用钢抗裂性的影响.结果表明:该钢具有一定的冷裂倾向.试验焊材熔敷金属扩散氢含量为1.7 mL/100 g,初期扩散氢逸出速率较大,在焊缝冷却过程中扩散氢可以较快逸出.残余扩散氢含量主要与从峰值温度到100℃温度区间的冷却时间t100有关,单道焊焊缝金属冷速快,t100较小,残余扩散氢较多,而多层多道焊增加了t100,且提高HDr100容许值,残余扩散氢含量很低.该钢采用焊后热处理是保守的工艺.
Cracking resistance test were carried out on the Q690 high strength steel with supporting wire( GHS75M),HDescape characteristics of deposited metal was measured,and the influence of residual diffusible hydrogen on cracking resistance of this steel was analyzed. The results show that the steel has high tendency to hard quenching. Diffusible hydrogen of deposited metal is 1. 7 mL /100 g. At initial stage,the escape rate of HDis high,and HDis escaped quickly. Residual diffusible hydrogen content is mainly related with t100,single-pass welding is cold fast,corresponding,t100 is short,thus,there will be more HDr100.However,t100 is longer with multi-pass welding,in the same time,the allowable value of HDr100 is increased,and HDr100 is lower. Postweld heat treatment for this steel is a conservative process.
Cracking resistance test were carried out on the Q690 high strength steel with supporting wire( GHS75M),HDescape characteristics of deposited metal was measured,and the influence of residual diffusible hydrogen on cracking resistance of this steel was analyzed. The results show that the steel has high tendency to hard quenching. Diffusible hydrogen of deposited metal is 1. 7 mL /100 g. At initial stage,the escape rate of HDis high,and HDis escaped quickly. Residual diffusible hydrogen content is mainly related with t100,single-pass welding is cold fast,corresponding,t100 is short,thus,there will be more HDr100.However,t100 is longer with multi-pass welding,in the same time,the allowable value of HDr100 is increased,and HDr100 is lower. Postweld heat treatment for this steel is a conservative process.
引文
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[2]刘毅.Q550及Q690高强钢焊接接头裂纹及应力分析[D].济南:山东大学,2011.LIU Yi.Welding crack and stress in joint of Q550 and Q690 steel[D].Jinan:Shan Dong University,2011.
[3]张田宏.船用大尺寸刚性试板抗裂性试验方法及应用[J].焊接,2005,(12):39-42.ZHANG Tianhong.Introduction and Application of Naval Rigid Sample Cracking Test[J].Welding,2005,(12):39-42.
[4]易传宝,张田宏.大尺寸刚性试板抗裂性试验与船体结构模型相关性研究[J].焊接,2006,(1):48-51.YI Chuanbao,ZHANG Tianhong.Research on the Relationship Between the Cracking Test of large Scale Rigid Sample and Ship Structure Model[J].Welding,2006,(1):48-51.
[5]魏金山,方洪渊.环境条件对10CrNi3MoV钢抗裂性的影响[J].焊接学报,2003,24(4):79-81.WEI Jinshan,FANG Hongyuan.Influence of environment condition on cracking resistance of 10CrNi3MoV steel[J].Transactions of the China Welding Institution,2003,24(4):79-81.
[6]魏金山,张京海,张田宏.熔敷金属扩散氢逸出特性研究[J].材料开发与应用,2003,18(1):20-22.WEI Jinshan,ZHANG Jinghai,ZHANG Tianhong.HD Escape Characteristic of Electrode Deposited Metal[J].Development and Application of Materials,2003,18(1):20-22.
[7]尹士科,金连生,黄古粉.焊缝中的氢及其逸出行为[J].试验研究,1994,4-7.YIN Shike,JIN Liansheng,HONG Gufen.Escape Behavior of Hydrogen in the Weld[J].Experimental Study,1994,4-7.
[8]张文钺.焊接冶金学[M].北京:机械工业出版社,1996:239-246.ZHANG Wenyue.Welding Metallurgy[M].Bei Jing:China Machine Press,1996:239-246.
[9]彭兴娜,魏金山,于德润等.液压支架用1000MPa级高强钢焊接性试验研究[J].煤矿机械,2012,33(4):66-68.PENG Xingna,WEI Jinshan,YU Derun,et al.Study on Weldability of 1000MPa Grade High Strength Steel for Hydraulic Support[J].Coal Mine Mechinery,2012,33(4):66-68.
[10]张文钺,祝美丽,秦伯雄.焊接冷裂纹敏感性的有效扩散氢及氢扩散因子[J].焊接学报,1991,12(3):129-135.ZHANG Wenyue,ZHU Meili,QIN Boxiong.Research on effective diffusive hydrogen and hydrogen diffusive factor of welding cold cracking susceptibility[J].Transactions of the China Welding Institution,1991,12(3):129-135.
[11]姚润钢.11MnNiCrMoV钢冷裂纹敏感性研究[D].天津:天津大学,2006.YAO Rungang.The Study of Cold Cracking Susceptibility of 11MnNiCrMoV Steel Plates[D].Tian Jin:Tian Jin University,2006.
[12]王征,桂赤斌,陈文君.焊接热循环过程中氢陷阱释放的数值分析[J].焊接学报,2011,32(7):100-104.WANG Zheng,GUI Chibin,CHEN Wenjun.Numerical analysis of hydrogen traps thermal desorption in weld thermal cycle[J].Transactions of the China Welding Institution,2011,32(7):100-104.