Effect of partitioning time on microstructure and properties of one-step quenched and partitioned steel

doi:10.13251/j.issn.0254-6051.2025.03.017

Abstract

Abstract: Based on the one-step quenching and partitioning (Q&P) process conditions, the effect of partitioning time (2,30 min) on the microstructure and properties of a tested one-step Q&P high-strength steel was studied by using universal tensile machine, scanning microscope, electron backscatter diffraction and X-ray diffractometer. The results show that the excellent comprehensive mechanical properties are obtained when the partitioning time is 2 min. The yield strength, tensile strength and percentage total extension at fracture are 965 MPa, 1288 MPa and 11.1%, respectively. The dislocation density in martensite increases and the retained austenite content decreases as the partitioning time increases. The difference in yield strength of the specimens under different partitioning time is mainly attributed to the different strengthening increments of solution strengthening, fine grain strengthening and dislocation strengthening, among which fine grain strengthening and dislocation strengthening contributions are dominant. The theoretical yield strength calculation results are in agreement with the tested results.

Key words: one-step Q&P steel, partitioning time, retained austenite, dislocation strengthening

CLC Number:

TG142.1

Wang Cheng, Ding Ru, Liu Yajun, Tong Shankang, Gan Xiaolong. Effect of partitioning time on microstructure and properties of one-step quenched and partitioned steel[J]. Heat Treatment of Metals, 2025, 50(3): 107-112.

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