Effect of heat treatment process on microstructure and properties of Cr15Ni2MnMoCuNbRE cast steel

doi:10.13251/j.issn.0254-6051.2022.02.032

Abstract

Abstract: Microstructure, mechanical properties and corrosive wear resistance of the Cr15Ni2MnMoCuNbRE cast steel treated by different heat treatment processes were investigated by means of SEM, mechanical property testing machine and corrosion-wear tester. The results show that the microstructure of the tested steel treated at 860 ℃ consists of austenite and network carbide. With the increase of heat treatment temperature, the microstructure and properties of the tested steel are improved. When heating temperature increases from 860 ℃ to 1000 ℃, the intergranular carbide amount of the tested steel decreases, the carbide morphology changes from network into fine rod shape, and the mechanical properties and corrosive wear resistance of the tested steel are improved significantly. Compared with that heat treated at 860 ℃, the hardness and impact absorbed energy of the tested steel heat treated at 1000 ℃ are increased by 5.9% and 49.8%, respectively, which reach 57.5 HRC and 35.5 J, and the corrosive wear resistance is increased by 1.88 times.

Key words: Cr15Ni2MnMoCuNbRE cast steel, heat treatment process, microstructure, mechanical properties, corrosive wear resistance

CLC Number:

TG243

Song Yanpei, Chen Danping, Zhou Han, Lin Xiaoli, Li Li. Effect of heat treatment process on microstructure and properties of Cr15Ni2MnMoCuNbRE cast steel[J]. Heat Treatment of Metals, 2022, 47(2): 178-182.

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