【摘要】 针对我国热作模具堆焊修复材料的缺乏和性能的不足,开展了马氏体时效不锈钢热作模具CO2气体保护焊金属粉芯堆焊焊丝的研究工作。通过改变Co元素的含量,研究了Co元素对所研制焊丝堆焊合金的硬度、时效行为、红硬性、显微组织和时效析出相的影响。结果表明,Co元素有利于焊后堆焊合金由奥氏体向马氏体转变,当w(Co)≥2%时堆焊合金为全马氏体组织;随着堆焊合金中Co元素含量增加,堆焊层的焊态硬度、时效态硬度和红硬性提高。更多还原

【Abstract】 To deal with the insufficient of hot work die surfacing material in our country,a Carbon-Dioxide Arc welding metal powder-cored wire was prepared.By changing the Cobalt content,the effect of Cobalt on the red hardness,aging achievement,tempering resistance,microstructure and the aging precipitation phase of the alloy were discussed respectively.The results show that Cobalt content has a major impact on the formation of martensite of prepared surfacing alloy.Besides,the red hardness of welded surfacing alloy,the hardness of aged surfacing alloy and the tempering resistance of aged surfacing alloy increase with the increase of Cobalt content.更多还原