关键词: 6Cr13马氏体不锈钢, 淬火, 显微组织, 力学性能

Abstract: 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.

Key words: martensitic stainless steel 6Cr13, quenching, microstructure, mechanical properties