淬火工艺对6Cr13马氏体不锈钢组织和性能的影响

研究了950～1130 ℃淬火及不同冷却方式对6Cr13马氏体不锈钢显微组织和力学性能的影响。结果表明,随着淬火温度的升高,残留碳化物含量逐步减少,在1050 ℃以上碳化物固溶速度加快,晶粒开始快速长大,残留奥氏体含量增大,导致在1050 ℃淬火硬度达到最大值,之后开始降低,在1150 ℃降低最为明显;950 ℃淬火时该钢种的水冷硬度高于空冷的硬度,而在950 ℃以上空冷硬度高于水冷的硬度;1050 ℃空冷可以获得较高的淬火硬度和较低的残留奥氏体含量,同时具有8%的碳化物含量,具有获得较好的耐磨性和较高的锋利度的条件。

Effect of quenching process on microstructure and properties of martensitic stainless steel 6Cr13

Effect of quenching at 950-1150 ℃ with different cooling methods on microstructure and mechanical properties of martensitic stainless steel 6Cr13 was studied. The results show that with the increase of quenching temperature, the content of residual carbides decreases gradually, then at above 1050 ℃, the carbide dissolution rate increases and the grains begin to grow rapidly, and the content of residual austenite increases gradually, by which the hardness reaches the maximum at 1050 ℃ and then begins to decrease, and such decrease becomes the most obvious at 1150 ℃. The water-cooled hardness of the steel is higher than that air cooled at 950 ℃, but when air-cooled at above 950 ℃, the hardness is higher than that of water-cooled. Air cooling at 1050 ℃ can obtain a higher quenching hardness, a lower retained austenite content, and a carbide content of 8%, with better wear resistance and higher sharpness.