摘要
采用自制药芯焊丝在3种焊接电流条件下堆焊获得了相应堆焊试样,对其显微组织进行了观察,并对相结构进行了分析。在此基础上,分析了焊接电流对堆焊金属硬度及耐磨性的影响。然后采用数值模拟方法对不同焊接电流的堆焊熔池温度进行了计算,并采用热力学软件对不同焊接电流堆焊金属在冷却过程中的CCT曲线进行了预测。结果表明,随着焊接电流的增加,堆焊熔池温度显著升高,堆焊金属的淬透性增加,从而使冷却后的堆焊金属中的马氏体含量增加,而残余奥氏体含量降低,导致堆焊金属的硬度和耐磨性均显著提升。
The Fe-Cr-C alloy hardfacing metals with three welding currents were manufactured by flux-cored-arc-welding （FCAW）. The microstructure was observed and the phase structure was determined. On this basis, effectof welding current on the hardness and wear resistance of the hardfacing metal was researched. Subsequently, thetemperatures of the surfacing molten pool with three welding currents were simulated by ANSYS software and theCCT curves of the hardfacing metals during the cooling process were calculated by Jmatpro software. The results indi-cate that, with the increasing of the welding current, molten pool temperatures of the hardfacing metals increased obviously which improved the hardenability. Therefore, the amount of martensite in the hardfacing metal increased,while that of retained austcnite decreased, which leads to the hardness and wear resistance increasing.
关键词
堆焊
焊接电流
显微组织
耐磨性
hardfacing, welding current, microstructure, wear resistance
