论文部分内容阅读
利用自行配置的高Cr药芯焊丝对GCr15冷轧辊钢进行堆焊,堆焊后分别进行空冷及400、500、600℃不同温度回火处理,研究了空冷及不同回火温度条件下堆焊层的显微组织、显微硬度以及耐磨性。结果表明:焊后空冷及不同温度回火条件下堆焊层的组织形貌、硬度及耐磨性具有较大的差异。焊后空冷条件下,堆焊层显微组织主要表现为力学性能较低的粗大片状马氏体,硬度较高但耐磨性较低;焊后随着回火温度的提高,粗大的片状马氏体逐渐转变为细小的板条状回火马氏体及粒状回火索氏体,硬度逐渐降低,当回火温度达到600℃时,硬度出现软化,当回火温度为500℃时,堆焊层的耐磨性最高。
The self-configuring high-Cr flux cored wire was used to build the GCr15 cold-rolled steel. After overlay welding, air-cooling and tempering at 400, 500 and 600 ℃ were carried out respectively. The effects of air-cooling and different tempering temperature on the surfacing layer Of the microstructure, microhardness and wear resistance. The results show that there are great differences in the microstructure, hardness and wear resistance of the overlay after air-cooling and tempering at different temperatures. Under the condition of air-cooling after welding, the microstructure of surfacing layer is mainly coarse flake martensite with lower mechanical properties, higher hardness but lower wear resistance; as the tempering temperature increases after welding, Like martensite gradually transformed into small lath tempered martensite and granular tempered sorbite, the hardness gradually decreased, when the tempering temperature reaches 600 ℃, the hardness appears softening, when the tempering temperature is 500 ℃ , Surfacing layer of the highest wear resistance.