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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。
Developed a new type of Fe-Cr-Mo-Ni-W hot die gas protection surfacing flux cored wire. The microstructure, thermal stability and thermal fatigue resistance of the surfacing alloy were studied by metallographic microscope and high temperature box resistance furnace. The results show that the microstructure of the Fe-Cr-Mo-Ni-W surfacing alloy is composed of lath martensite and retained austenite with a weld hardness of 47.8 HRC. During the tempering heat treatment at 550 ℃, Extend, surfacing layer hardness gradually decreased and tends to be gentle. The thermal stability of the surfacing alloy developed is better than that of the foreign similar welding consumables, and the thermal fatigue crack resistance is similar, which is obviously better than the commonly used hot work die steel 5Cr Ni Mo.