Research on the Uniformity of the Hardness of Large Scale 5CrNiMoV Hot-Work Die Steel
Abstract: The 5CrNiMoV hot-work die steel pretreatment after forging process was studied. The results showed that there were many undissolved carbides founded in the pretreatment of metallographic organization under the conventional process, belonging to subcooled organization; meanwhile the coarse microstructure from forging failed to eliminate, seriously affecting the subsequent quenching process, and its hardness uniformity was difficult to meet customer demand. Adopting recrystallization + high temperature normalizing heat treatment process of preparation, homo-geneous and fine pseudo-eutectoid microstructure was gotten, and the time of spheroidizing an-nealing was also greatly shortened, providing a good pre-microstructure for subsequent quenching; thus it was realized that the uniformity of hardness from the surface to the core can be less than HRC 1.5, when the hardness is higher than 42 HRC.
文章引用: 杨梅梅 , 管志杰 (2015) 大规格5CrNiMoV热作模具钢的硬度均匀性研究。 材料科学， 5， 213-218. doi: 10.12677/MS.2015.56029
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