Domex 700MC钢焊接接头的微动磨损性能

采用实芯焊丝CO2气体保护焊方法焊接了低合金高强钢Domex 700MC,在无缺陷的焊态接头试样上从焊缝区、熔合区和焊接热影响区中分别截取试样进行微动磨损试验,用SEM观察了磨痕形貌。结果表明:在选定的微动磨损试验参数下,不同部位金属的磨痕面积差异较小,磨损体积和最大磨痕深度差异较大;接头不同部位金属具有不同的微动磨损性能,焊缝中心金属的耐微动磨损性最好;磨损面上存在与滑移方向成不同角度的微裂纹,这些微裂纹扩展、相交后导致金属呈块状或颗粒状脱落,所形成的凹坑有利于新的微裂纹形成。

Fretting Wear Property of Domex 700MC Welded Joints

The high strength low alloy steel Domex 700MC welded joints were prepared by solid wire carbon-dioxide arc welding process.The specimens for fretting wear test were cut from the sound as-welded joints at the weld zone,fusion zone and heat affected zone respectively.The fretting wear tests were carried out,and the morpholgy of the fretted wear scars were observed using SEM.The results show that under the test conditions,the plane surface area of the worn scars of the welded joints varied less,but the worn of...