Effect of solution time on microstructure and properties of powder stainless steel D41A

doi:10.13251/j.issn.0254-6051.2025.05.021

Abstract

Abstract: Wear-resistant and corrosion-resistant powder stainless steel D41A was prepared by hot isostatic pressing. The microstructure and properties of the original powder particles and the D41A powder steel after solution treatment for different time were tested by means of metallographic microscope, scanning electron microscope, X-ray diffraction and hardness tester, etc. The effect of solution time on the microstructure and properties was analyzed. The results show that lamellar Cr-rich carbides and granular V-rich carbide particles appear on the matrix inside the original powder. After solution treatment at 1160 ℃, with the prolongation of solution time, the Cr-rich carbides gradually spheroidize first. When the time is extended to 4 h or more, the Cr-rich carbide particles are connected again, and the maximum size exceeds 10 μm. While the average size of the V-rich carbides remains stable at 0.5-1.0 μm all the time. Both the hardness and impact absorbed energy of the D41A powder stainless steel show a trend of first increasing and then decreasing with the prolongation of solution time. After solution treatment for 2 h, the hardness and impact absorbed energy reach the highest values, which are 60.8 HRC and 27 J, respectively, where the matching of the carbide size, hardness and impact property of the D41A steel reaches the optimum.

Key words: hot isostatic pressing, solution treatment, powder stainless steel D41A, carbide, hardness, impact absorbed energy

CLC Number:

TG161

Yuan Zhizhong, Niu Zongran, Wang Zhiyuan, Ju Yulin, Xu Huixia, Liao Jun, Yu Yang, Cheng Xiaonong. Effect of solution time on microstructure and properties of powder stainless steel D41A[J]. Heat Treatment of Metals, 2025, 50(5): 132-139.

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