Effect of Ni content on microstructure and mechanical properties of 40CrNi3MoV steel strengthened by NiAl-Cu

doi:10.13251/j.issn.0254-6051.2023.08.001

Abstract

Abstract: For 40CrNi3MoV steel strengthened by NiAl-Cu precipitation, the effect of different Ni content on microstructure and mechanical properties of the tested steel tempered at 450-650 ℃ was studied. The microstructure of the tested steel was characterized by OM, the precipitates in the the tested steel were characterized by means of TEM and EDS, and the mechanical properties of the tested steel were measured by room temperature tensile and low temperature impact tests. The results show that the Ni content has no obvious effect on the microstructure of the tested steel. The increase of Ni content (3.0%-4.0%) promotes the precipitation of Cu-rich phase and NiAl phase in the tested steel, and increases the amount of nano particles. With the increase of Ni content, the tensile strength and yield strength of the tested steel tempered at 500 ℃ are increased by 200 MPa and 100 MPa, respectively.

Key words: 40CrNi3MoV steel, tempering temperature, mechanical properties, Ni content, NiAl-Cu nano composite precipitation

CLC Number:

TG142

Liang Enpu, Xu Le, Yang Yong, Wang Maoqiu. Effect of Ni content on microstructure and mechanical properties of 40CrNi3MoV steel strengthened by NiAl-Cu[J]. Heat Treatment of Metals, 2023, 48(8): 1-7.

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