Influence of Deep Cryogenic Treatment Process on Microstructure and Properties of M2 High Speed Steel
HU Haibo1, ZHU Lihui1,*, TU Youwang1, DUAN Yuanman1, WU Xiaochun1, GU Bingfu2
1 School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China 2 Jiangsu Fuda Special Steel Co., Ltd., Yangzhong 212200, Jiangsu, China
Abstract: The M2 high speed steel was cryogenically treated for different time or repeated for three cycles, and the influence and mechanism of deep cryogenic treatment on the hardness, red hardness, impact toughness, wear resistance at high temperature and microstructure of M2 high speed steel were studied by measuring hardness, impact toughness and high-temperature friction and wear property combined with X-ray phase analysis, scanning electron microscopic analysis and transmission electron microscopic analysis. The results showed that after deep cryogenic treatment, the amount of retained austenite reduced, the primary eutectic carbides decomposed, the secondary carbides precipitated dispersedly, and the twin martensite was thinned in M2 high speed steel. Therefore, the hardness, red hardness, impact toughness and high temperature wear resistance improved. The prolonging of deep cryogenic time and cyclic cryogenic treatment were beneficial to improving the properties. The microstructure and properties of M2 steel were improved most significantly after deep cryogenic treatment for three times. Compared with the specimen without deep cryogenic treatment, the specimen after deep cryogenic treatment for three times led to 50% reduction in retained auste-nite, 75.2% reduction in large-sized primary carbides and 296% increase in secondary carbides. Consequently, after deep cryogenic treatment for three times, the room temperature hardness increased 2.27%, red hardness increased 2.7%, impact toughness increased 15.6%, and relative wear resistance at high temperature increased 140%. Hence cyclic deep cryogenic treatment is more beneficial for property improvement and cost reduction compared with the long-time deep cryogenic treatment.
胡海波, 朱丽慧, 涂有旺, 段元满, 吴晓春, 顾炳福. 深冷处理工艺对M2高速钢显微组织与性能的影响[J]. 材料导报, 2023, 37(9): 21110028-6.
HU Haibo, ZHU Lihui, TU Youwang, DUAN Yuanman, WU Xiaochun, GU Bingfu. Influence of Deep Cryogenic Treatment Process on Microstructure and Properties of M2 High Speed Steel. Materials Reports, 2023, 37(9): 21110028-6.
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2023, Vol. 37 
