Effect of solution and aging treatment on microstructure and properties of high manganese low nickel stainless steel

doi:10.13251/j.issn.0254-6051.2021.10.012

Abstract

Abstract: Effects of solution and aging temperature on microstructure and properties of a new type high manganese low nickel stainless steel were studied. The results show that the microstructure of annealed and solution treated high manganese low nickel stainless steel are composed of a single phase austenite. With the increase of solution temperature, the grain grows and precipitates dissolve into the matrix, which makes the strength and hardness of the material decrease continuously. After solution treated at 1050 ℃, all precipitates have been dissolved, meanwhile, the tensile strength is 1016 MPa, elongation and reduction of area are 67.43% and 53.6%respectively, and the plasticity is the best. Therefore, the best solution temperature of the high manganese low nickel stainless steel is 1050 ℃. Moreover, the precipitates in the high manganese low nickel stainless steel are mainly Cr carbon nitride and Mn sulfide after solution an aging treatmant. After aging at 750 ℃, the content of precipitates reaches the peak, and the strength and hardness reach the highest. Therefore, 750 ℃ is the most sensitive precipitation temperature of the high manganese low nickel stainless steel. When the aging temperature is above 750 ℃, the content of precipitates decreases, and the plasticity of the material is the best when aged at 850 ℃.

Key words: high manganese low nickel stainless steel, solution, aging, microstructure, properties

CLC Number:

TG161

Tang Peng, Yu Fengyang, Zhao Yanjun, Hu Zhiliu, Long Zhengliang. Effect of solution and aging treatment on microstructure and properties of high manganese low nickel stainless steel[J]. Heat Treatment of Metals, 2021, 46(10): 74-80.

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