Steel AISI O2 (type 9G2) for a cold-working tool after different quenching, tempering, and cryogenic treatment regimes is studied. It is established that after cryogenic treatment the amount of residual austenite decreases by a factor of 4.3 compared with a quenched condition. The highest hardness 69 HRC is achieved after quenching and cryogenic treatment, and in this case wear resistance is higher by a factor of 2.36 than after quenching and tempering. After cryogenic treatment there is also a reduction in friction coefficient.

中文翻译：

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AISI O2工具钢深冷热处理后的显微组织和摩擦学性能

研究了经过不同淬火、回火和低温处理方案后用于冷加工工具的钢 AISI O2（9G2 型）。已确定，与淬火状态相比，深冷处理后残余奥氏体的量减少了 4.3 倍。淬火和深冷处理后达到最高硬度 69 HRC，在这种情况下，耐磨性比淬火和回火后高 2.36 倍。低温处理后，摩擦系数也会降低。