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718塑料模具钢 (0 .35C 1.74Cr 1.2 2Ni)淬火马氏体经过回火得到的回火托氏体组织均匀细小 ;而淬火贝氏体的回火组织较粗大。据此提出了 85 0℃奥氏体的预硬化处理工艺以保证获得马氏体组织。
718 plastic mold steel (0.35C 1.74Cr 1.2 2Ni) tempered martensite obtained after tempering the uniform fine Temper; and tempered bainite tempered tissue coarser. According to this, the austenite pre-curing process at 85 ℃ is proposed to ensure the martensitic structure.