Optimization of heat treatment process of 10CrNiCu low alloy cast steel based on orthogonal test

doi:10.13251/j.issn.0254-6051.2023.10.022

Abstract

Abstract: Effects of normalizing times, tempering temperature and tempering time on mechanical properties and microstructure of 10CrNiCu low alloy cast steel were investigated by means of orthogonal test and variance analysis. The results show that yield strength and low temperature impact property of the cast steel rise when normalizing times increases due to the microstructure refinement. By tempering at higher temperature and extending the tempering time, the M/A islands in the bainite where in the segregation band and ferrite are recovered, resulting in a significant reduction of yield strength and a certain improvement of the low temperature impact property. However, too long tempering time coarsens the carbide and Cu precipitations in the cast steel and has no benefit to the improvement of low temperature impact property. Under the optimal heat treatment process of twice normalizing at 900 ℃ and tempering at 630 ℃ for 4 h, the yield strength of the cast steel can reach 440 MPa, and the -40 ℃ and -80 ℃ KV₂ can reach 246 J and 137 J, respectively.

Key words: 10CrNiCu cast steel, orthogonal test, heat treatment, M/A island

CLC Number:

TG142.2

Huang Dong, Yang Chaofei, Zhang Baowei, Zhou Xiaofeng. Optimization of heat treatment process of 10CrNiCu low alloy cast steel based on orthogonal test[J]. Heat Treatment of Metals, 2023, 48(10): 151-156.

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