摘要
研制了一种新型Fe-Cr-Mo-Ni-W热作模具气保护堆焊药芯焊丝。利用金相显微镜、高温箱式电阻炉等对其堆焊合金的显微组织结构、热稳定性、抗热疲劳性能进行了研究。结果表明:Fe-Cr-Mo-Ni-W堆焊合金显微组织由板条马氏体+残余奥氏体组成,焊态硬度47.8 HRC;550℃回火热处理过程中,随着热处理时间的延长,堆焊层硬度逐步降低并趋于平缓。研制的堆焊合金热稳定性优于国外同类焊材,抗热疲劳裂纹性能相近,并明显优于常用的热作模具钢5Cr Ni Mo。
A newly developed Fe-Cr-Mo-Ni-W gas shielding Hardfacing hardfacing flux-cored wire was designed for hotworking die. The microstmcture, thermal stability and thermal fatigue resistance of the surfacing alloy were analyzed byoptical microscope （OM） and high temperature box resistance furnace. The results show that the microstmctum of theFe-Cr-Mo-Ni-W surfacing alloy consists of lath martensite and residual austenite. The hardness of the as-welded surfacingalloy is 47.8 HRC. With increasing the heat treatment time, the hardness of surfacing alloy decreases and becomes stable.Compared to the welding material abroad with similar composition, the thermal stability of the surfacing alloy is better and thethermal fatigue crack resistance is comparable, which is much better than that of commonly used die steel 5CrNiMo.
出处
《热加工工艺》
CSCD
北大核心
2016年第21期224-226,232,共4页
Hot Working Technology
关键词
热作模具
气体保护电弧焊
热疲劳
hot working die
gas shielded arc welding
thermal fatigue
