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几年来,我厂160吨摩擦压力机使用的3Cr2W8Y钢热锻模,采用1050～1100℃淬火,600～620℃回火,硬度一般为HRC47～49。锻模使用中有两种破坏形式:一种是早期断裂,往往发生在模具有冷却条件下锻造500～2000件左右的时候。模具在使用中受到锻压金属很大的压力和金属流动产生的剪切应力,仅表面形成很多细小的条痕(沟槽),受到金属氧化后的冲击和反复加热、冷却温度变化,模具表面产生拉、压交变热应力形成表面裂纹,在机械应力和热应力作用下裂
Over the past few years, I plant 160 tons of friction press 3Cr2W8Y steel hot forging die, using 1050 ~ 1100 ℃ quenching, 600 ~ 620 ℃ tempering, the hardness is generally HRC47 ~ 49. Forging dies are used in two forms of damage: one is early fracture, often occurs when the mold is forged with cooling conditions of about 500 to 2000 pieces. In use, the die shear stress by forging a metal and a lot of pressure generated by the flow of metal, only the surface of many fine streaks (trench), after the impact of a metal oxide and repeated heating and cooling temperature change, the mold surface is generated Pull, pressure alternating thermal stress to form surface cracks, cracking under mechanical and thermal stress