14NiCrMo10 6V与Q345E焊接接头组织与力学性能的研究
Study on Microstructure and Properties of Q345E and 14NiCrMo10 6V Welded Joints
刘 静1, 郑华勇2, 许鸿吉2, 谢 明2
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作者单位：（1.大连机车车辆有限公司 工艺技术部,辽宁 大连 116028；2.大连交通大学 材料学院,辽宁 大连 116028）
中文关键字：Q345E低合金钢； 14NiCrMo10 6V低合金钢； 焊接接头； 力学性能
英文关键字：Q345E low-alloy steel; 14NiCrMo10 6V low-alloy steel; welded joints; mechanical properties
中文摘要：通过室温拉伸、弯曲、冲击、硬度试验及金相分析,对Q345E低合金钢与14NiCrMo10 6V低合金钢混合气体保护焊焊接接头的力学性能与显微组织进行了研究。结果表明：采用ER50-6实芯焊丝焊接时,可以获得拉伸、弯曲和冲击性能均良好的焊接接头；焊缝区硬度较均匀,焊缝硬度在210~250 HV之间；焊接接头焊缝中心组织为先共析铁素体分布于柱状晶界上,晶内为针状铁素体与珠光体；Q345E侧熔合区组织为沿晶界析出块状先共析铁素体和向晶内生长的条状铁素体以及少量的珠光体和贝氏体；14NiCrMo10 6V侧熔合区和过热区组织为板条状马氏体和粒状贝氏体。
英文摘要： By room temperature tensile, bending, impact, hardness test and metallographic analysis，the mechanical properties of welded joints and microstructure of Q345E low-alloy steel and 14NiCrMo10 6V low-alloy steel mixed gas arc welding were studied. The results show that using ER50-6 solid welding wire, the stretching, bending and impact properties of the welded joints are good; the hardness of the weld zone is uniform，the hardness of the weld is 210-250 HV; the microstructure of weld center in welded joints is eutectoid ferrite distributing in the columnar grain boundaries, intragranular acicular ferrite and the pearlite; Q345E side of the fusion zone of block precipates eutectoid ferrite along the grain boundaries and the intragranular ferrite along the bar and a small amount of pearlite and bainite; the fusion zone and heat zone of 14NiCrMo10 6V side is the lath martensite and granular bainite.