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在对铸造锻模失效分析和服役条件的基础上,设计了一种用于堆焊模具基体的低合金铸钢的化学成分及热处理工艺,并进行了实际制造和生产试验。利用光学显微镜、电子万能试验机和HDX-100数字式显微硬度计分析了试验铸钢基体堆焊模具服役前后基体的组织和性能。结果表明,服役前后铸钢基体显微组织均为珠光体、铁素体和碳化物;服役后偏析减弱,表面未见显微裂纹。服役后铸钢基体抗拉强度、屈服强度、伸长率及断面收缩率及硬度均有所降低,下降比例分别为34%、17%、17%、32%及10%。服役后的试验铸钢基体仍满足堆焊锻模的使用要求,可进行后续再制造。
Based on the failure analysis and service conditions of the forging die, a chemical composition and heat treatment process for the low alloyed steel used for the welding of the die base were designed and the actual manufacturing and production tests were carried out. The microstructure and properties of the substrate before and after service of the cast-in-situ steel mold were analyzed by optical microscope, electronic universal testing machine and HDX-100 digital microhardness tester. The results show that the microstructures of cast steel before and after service are pearlite, ferrite and carbides. After service, the segregation decreases and no microcracks appear on the surface. After service, the tensile strength, yield strength, elongation, reduction of area and hardness of the cast steel matrix all decreased, with the decreasing proportions being 34%, 17%, 17%, 32% and 10% respectively. After the trial of the cast steel substrate still meet the requirements of surfacing forging die, can be followed by remanufacturing.