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对喷射成形H13钢经不同液氮深冷工艺处理后,对其硬度、冲击性能、拉伸性能以及摩擦磨损性能进行测试,并通过SEM和XRD分析其显微组织及相组成。结果表明,喷射成形H13钢经深冷处理后硬度和强度变化不大,冲击性能和耐磨性能大幅度提高。深冷工艺为1050℃淬火+深冷处理(-196℃×20 h)+二次回火(600℃×2 h)时,喷射成形H13钢具有最优的综合性能,其冲击性能和耐磨性能较常规热处理(1050℃淬火+二次回火(600℃×2 h))分别提高80%和78%。喷射成形H13钢经深冷处理后,亚稳态的残留奥氏体完全转变为马氏体,同时马氏体板条碎化以及微细碳化物弥散析出,改善了材料的综合性能。
The hardness, impact properties, tensile properties and friction and wear properties of spray-formed H13 steel after different liquid nitrogen cryogenic treatment were tested. The microstructure and phase composition of H13 steel were analyzed by SEM and XRD. The results show that the hardness and strength of spray-formed H13 steel after cryogenic treatment have little change, and the impact properties and wear resistance have been greatly improved. When the cryogenic process is quenching + cryogenic treatment (-196 ℃ × 20 h) + secondary tempering (600 ℃ × 2 h) at 1050 ℃, H13 steel prepared by injection molding has the best comprehensive properties, the impact performance and wear resistance Conventional heat treatment (1050 ℃ quenching + secondary tempering (600 ℃ × 2 h)) increased by 80% and 78% respectively. After cryogenic treatment of H13 steel, the metastable retained austenite completely transformed to martensite, meanwhile the martensite laths were broken down and the fine carbides were dispersed and precipitated, which improved the overall properties of the material.