Effect of Q&P process on microstructure and properties of 5CrMnNiMo ultra-high strength steel

doi:10.13251/j.issn.0254-6051.2022.05.037

Abstract

Abstract: Quenching and partitioning (Q&P) process was performed for 5CrMnNiMo ultra-high strength steel. The changes of microstructure and mechanical properties of the tested steel with isothermal partitioning for 5 min, 24 h and non-isothermal partitioning for 6 h under Q&P process were investigated by means of SEM, electronic universal testing machine, X-ray diffraction and EBSD. The results show that during Q&P treatment, the microstructure is composed of martensite, retained austenite and a small amount of granular carbide. The retained austenite gradually transforms from flake to block with the prolongation of isothermal partitioning time. After isothermal partitioning for 5 min, the ultra-high tensile strength of 2230 MPa is obtained. The tensile strength is decreased to 1360 MPa after isothermal partitioning for 24 h and the plastic deformation is increased from 3.92% (isothermal partitioning time of 5 min) to 14.62% (non-isothermal partitioning time of 6 h). The TRIP effect is the main reason for the increase of plastic deformation.

Key words: Q&P process, ultra-high strength steel, microstructure, mechanical properties

CLC Number:

TG142.1

Suo Zhongyuan, Du Yang, Fu Liming, Shan Aidang. Effect of Q&P process on microstructure and properties of 5CrMnNiMo ultra-high strength steel[J]. Heat Treatment of Metals, 2022, 47(5): 217-220.

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