机械振动对WQ960钢焊接接头组织与性能的影响  

Effect of mechanical vibration on microstructure and properties of welded joint of WQ960 steel

作　　者：王茵[1] 田兴强[1] 李敏[1] WANG Yin;TIAN Xingqiang;LI Min(Department of Mechanical and Electronic Engineering,Guizhou Jiaotong College,Guiyang,Guizhou 550008,China)

机构地区：[1]贵州交通职业技术学院机电工程系,贵州贵阳550008

出　　处：《贵州师范大学学报（自然科学版）》2018年第5期60-64,共5页Journal of Guizhou Normal University：Natural Sciences

基　　金：贵州省高层次创新型人才培养项目(黔科合人才[2015]4009)

摘　　要：对WQ960低合金高强钢焊接过程中施加了不同机械振动频率的振动处理,研究了机械振动频率对焊接接头力学性能、冲击性能、断后形貌和显微组织的影响。结果表明,不同机械振动频率下的焊缝区的金相组织都主要为先共析铁素体+晶内针状铁素体,但随着机械振动频率的增加,柱状晶的含量明显降低,焊接接头的抗拉强度和断后伸长率表现为先增加后减小的趋势;在振动频率为50 Hz时,可获得抗拉强度和断后伸长率的最大值为875 MPa和14%;机械振动频率为50 Hz时,获得焊接接头冲击功最大值为71 J;机械振动频率对焊接接头力学性能的影响主要与振动过程中熔池里的夹杂物分布等有关。Different mechanical vibration fi＇equency of vibration during welding process were conducted on high strength WQ960 low alloy steel. The effect of mechanical vibration frequency on the mechanical properties, impact properties, fracture morphology and microstructure of welded joint were studied. The results showed that, the metallographic structure of weld seams with different mechanical vibration frequencies is mainly the first eutectoid ferrite ＋ acicular ferrite in the crystal, but with the increase of mechanical vibration frequency. And the content of columnar crystal decreases obviously. The strength and elongation of the welding joint increased firstly, and decreased afterwards. When the vibration frequency is 50 Hz, the maximum tensile strength and post-bleak elongation can be obtained as 875 MPa and 14% , while the value of impact for the welding joint was also up to the maximum value （71 J） when the mechanical vibration frequency was 50 Hz. The influence of the mechanical vibration frequency on the mechanical properties of the welded joints mainly concerned to the distribution of the inclusion in the molten pool during vibration.

关 键 词：机械振动 WQ960钢 焊接接头 力学性能 显微组织 

分 类 号：TD404[矿业工程—矿山机电]