Effects of Al and Cu additions on microstructure and mechanical properties of 40CrNi3MoV steel

doi:10.13251/j.issn.0254-6051.2022.04.003

Abstract

Abstract: Change of microstructure and mechanical properties of 40CrNi3MoV steel with Al and Cu additions after oil quenched at 900 ℃ and then tempering at 450-650 ℃ was studied by OM, SEM, TEM and mechanical properties test. The results show that the microstructure of the tested steel after quenching and tempering is mainly tempered sorbite with nano-scale NiAl-Cu precipitates and the range of optimal tempering temperature is 500-550 ℃. The precipitation of NiAl precipitates with nano-scale B2 structure in the matrix has a strong hindering effect on the propagation of micro-cracks in the tested steel with Al addition, and the resulted maximum increase of tensile strength of the steel is 200 MPa. While after further addition of Cu, the yield strength increment of the tested steel is 150 MPa due to the interaction of the Cu-rich phase and dislocations. In such state, the tested steel owns tensile strength and yield strength of 1706 MPa and 1505 MPa respectively, and its tensile and impact fractures show typical cleavage fracture characteristics with obvious tearing edges.

Key words: 40CrNi3MoV steel, NiAl-Cu nanocomposite precipitation, tempering temperature, mechanical properties, microstructure

CLC Number:

TG142

Liang Enpu, Xu Le, Yang Yong, Wang Maoqiu. Effects of Al and Cu additions on microstructure and mechanical properties of 40CrNi3MoV steel[J]. Heat Treatment of Metals, 2022, 47(4): 17-23.

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