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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Deep Cryogenic Treatment on Mechanical Properties and Microstructure of the Tool Steel CR7V for Hot Stamping
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Effect of Deep Cryogenic Treatment on Mechanical Properties and Microstructure of the Tool Steel CR7V for Hot Stamping

机译：深冷冻处理对钢筋混凝土钢CR7V机械性能和微观结构的影响

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摘要

To solve the failure problem of hot stamping tool, the CR7V steel was deep cryogenically treated at different dwelling times with multiple tempering. The hardness, impact toughness and wear resistance of the CR7V steel were examined, and the effects of deep cryogenic treatment on the microstructure of the CR7V steel were studied by means of optical microscope, scanning electron microscope and energy-dispersive spectroscopy. The results show that deep cryogenic treatment has little effect on the hardness of the tempered CR7V steel, but improves its impact toughness and wear resistance. The improvement in mechanical properties is a result of the combination of dissolution of large carbide particles, formation of small-sized and uniformly distributed carbide particles and fine tempered martensite structure. The cryogenic treatment is optimized as follows: vacuum gas quenching, deep cryogenic treatment at ??196?°C for 6?h and triple tempering at 560?°C for 2?h, which improves the wear resistance by 68% and the impact toughness by 58% compared to the conventional heat treatment.
机译：为了解决热冲压工具的故障问题，CR7V钢在不同的居住时深度低温处理，具有多次回火。研究了CR7V钢的硬度，冲击韧性和耐磨性，并通过光学显微镜，扫描电子显微镜和能量分散光谱研究了对CR7V钢的微观结构对CR7V钢的微观结构的影响。结果表明，深层低温治疗对钢化CR7V钢的硬度几乎没有影响，而是改善其冲击韧性和耐磨性。机械性能的改善是大碳化物颗粒溶解的组合，小尺寸和均匀分布的碳化物颗粒和细钢制马氏体结构的形成。低温处理如下优化：真空气体淬火，在196℃下深冷冻处理，在560Ω℃下进行6℃和三重回火2？H，这将耐磨性提高68％和冲击与常规热处理相比，韧性为58％。

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