Effect of aging temperature on microstructure of GX40CrSi17  ferritic heat resistant cast steel

doi:10.13251/j.issn.0254-6051.2023.12.006

Abstract

Abstract: To investigate the effect of aging temperature on the microstructure changes of GX40CrSi17 ferrite heat resistant cast steel, JMatPro software was used to simulate the equilibrium phase diagram and precipitation phase content changes with temperature of the tested steel. The microstructure, composition of the precipitation phase, and hardness changes after aging at different temperatures were characterized and analyzed through optical microscopy, scanning electron microscopy, energy spectrum analysis and Brinell hardness tester. The results show that after aging at 850 ℃, the microstructure is composed of a large number of fine and granular M₂₃C₆ carbides dispersed in the ferrite matrix, and the hardness decreases compared to that of as-cast. When the aging temperature rises to 950 ℃, the amount of M₂₃C₆ phase in the matrix decreases significantly due to re-dissolution, the grain size grows, and the grain boundaries tend to flatten. When aged at 1050 ℃, the grain boundaries are more straight, and the matrix structure is composed of ferrite and austenite phases. The hardness continues to decrease with the increase of aging temperature.

Key words: ferritic heat resistant cast steel, high temperature aging, microstructure, thermodynamic simulation

CLC Number:

TG142.7

Li Jie, Hu Jianwen, Lu Zitong. Effect of aging temperature on microstructure of GX40CrSi17 ferritic heat resistant cast steel[J]. Heat Treatment of Metals, 2023, 48(12): 36-43.

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Effect of aging temperature on microstructure of GX40CrSi17 ferritic heat resistant cast steel

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