Strip segregation in PH13-8Mo stainless steel and its evolution during heat treatment

doi:10.13251/j.issn.0254-6051.2024.07.023

Abstract

Abstract: Taking a PH13-8Mo stainless steel shaft part as the research object, the microstructure characteristics of strip segregation in the PH13-8Mo stainless steel and its evolution during solution treatment and aging were studied. The results show that there exist two types of strip segregation in the microstructure of the steel, namely component segregation strip and δ-ferrite segregation strip. The component segregation strip distributes in a straight and continuous pattern, but the δ-ferrite segregation strip distributes in a straight and discontinuous pattern. In the component segregation strip with positive segregation of Ni and negative segregation of Fe, the content of Ni and Fe is 11% and 72%, respectively, lower and higher than the content of Ni and Fe elements in the steel. In the δ-ferrite segregation strip, the content of Ni and Fe is 4% and 71%, respectively, which are lower than the average content of Ni and Fe in the steel, the content of Cr, Mo and Al is 17%, 4.5% and 1.84%, respectively, which are higher than the average content of Cr, Mo and Al in the steel. The component segregation strip in the PH13-8Mo stainless steel can be effectively eliminated by solution treatment at 1100 ℃ for 2 h and then aging at 540 ℃ for 4 h, but the δ-ferrite segregation strip can not be effectively eliminated.

Key words: PH13-8Mo stainless steel, strip segregation, solution treatment and aging

CLC Number:

TG142.1

Chen Suming, Yue Shan, Hu Shengshuang, Zhao Hu, Li Yi, Wu Haifeng, Ouyang Delai. Strip segregation in PH13-8Mo stainless steel and its evolution during heat treatment[J]. Heat Treatment of Metals, 2024, 49(7): 152-156.

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