焊接电流对36Mn2V/45异种钢焊接接头组织和力学性能的影响
|
摘要
采用CO_2气体保护焊焊接螺旋钻杆36Mn2V杆体和45钢叶片,运用宏观形貌、显微组织观察、显微硬度检测等方法研究了焊接电流对36Mn2V/45异种钢焊接接头微观组织和力学性能的影响。结果表明:随着焊接电流的增大,焊缝熔深与余高均增大,熔宽基本未变,焊缝成形系数减小。焊缝金属组织主要由侧板条铁素体、富碳马氏体、残余奥氏体以及弥散分布的粒状贝氏体组成。45钢侧粗晶区主要由马氏体和条状贝氏体组成。36Mn2V侧粗晶区主要由铁素体、马氏体及少量的粒状贝氏体组成。焊接电流较小时,焊缝金属和粗晶区的的组织较为细小均匀。接头热影响区和焊缝金属的显微硬度随着焊接电流的增大而降低。
The welding of 36Mn2V rod and 45 steel blade was carried out by using CO_2 gas shielded arc welding.The effects of welding current on the microstructure and mechanical properties of 36Mn2V/45 dissimilar steel welded joint were studied by observation of macroscopic morphology,microstructure and microhardness test,etc.The results show that with the increase of welding current,the weld penetration and reinforcement increase,the weld width does not change,and the weld forming factor decreases.The microstructure of weld metal mainly consists of side strip ferrite,carbon rich martensite,retained austenite and dispersively distributed granular bainite.The coarse grain region at side of 45 steel mainly consists of martensite and strip bainite,and that at side of 36Mn2V steel mainly consists of ferrite,martensite and a small amount of granular bainite.When the welding current is small,the microstructure of weld metal and coarse grain region is fine and uniform.The microhardness of heat affected zone and weld metal of the welded joint decreases with the increase of welding current.
The welding of 36Mn2V rod and 45 steel blade was carried out by using CO_2 gas shielded arc welding.The effects of welding current on the microstructure and mechanical properties of 36Mn2V/45 dissimilar steel welded joint were studied by observation of macroscopic morphology,microstructure and microhardness test,etc.The results show that with the increase of welding current,the weld penetration and reinforcement increase,the weld width does not change,and the weld forming factor decreases.The microstructure of weld metal mainly consists of side strip ferrite,carbon rich martensite,retained austenite and dispersively distributed granular bainite.The coarse grain region at side of 45 steel mainly consists of martensite and strip bainite,and that at side of 36Mn2V steel mainly consists of ferrite,martensite and a small amount of granular bainite.When the welding current is small,the microstructure of weld metal and coarse grain region is fine and uniform.The microhardness of heat affected zone and weld metal of the welded joint decreases with the increase of welding current.
引文
[1]张伟,王梅,鞠艳美,等.N80级非调质油井管用钢的研制开发[J].山东冶金,2008,30(6):31-33.
[2]李伟.工程机械专用高效CO2气体保护焊焊丝的研制[D].安徽:合肥工业大学,2013:2-4.
[3]李亚江.焊接冶金学材料焊接性[M].北京:机械工业出版社,2011:260-261.
[4]刘喜惠.压力容器制造过程中的异种钢焊接[J].黑龙江科技信息,2007,10(1):5.
[5]张富巨,李朝志.药芯焊丝电弧焊的焊缝成形系数[J].焊接技术,1998,6(3):7-8.
[6]Meri觭C,Atik E,Engez T.Experimental microhardness for AA1030,Cu,Cu Sn7,Cu Zn30 and 6114 alloys and a correlation with the Hall-Petch relation[J].Material Research Bulletin,2000,34(12):2043-2052.
[7]李宏义.焊接电流变化对镁合金TIG焊接的影响[J].电焊机,2015,45(2):105-111.
[2]李伟.工程机械专用高效CO2气体保护焊焊丝的研制[D].安徽:合肥工业大学,2013:2-4.
[3]李亚江.焊接冶金学材料焊接性[M].北京:机械工业出版社,2011:260-261.
[4]刘喜惠.压力容器制造过程中的异种钢焊接[J].黑龙江科技信息,2007,10(1):5.
[5]张富巨,李朝志.药芯焊丝电弧焊的焊缝成形系数[J].焊接技术,1998,6(3):7-8.
[6]Meri觭C,Atik E,Engez T.Experimental microhardness for AA1030,Cu,Cu Sn7,Cu Zn30 and 6114 alloys and a correlation with the Hall-Petch relation[J].Material Research Bulletin,2000,34(12):2043-2052.
[7]李宏义.焊接电流变化对镁合金TIG焊接的影响[J].电焊机,2015,45(2):105-111.