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| Effects of smelting process on fatigue performance of 15-5PH stainless steel |
| GUAN Zhen1,2, SUN Yong-qing2, LI Li1, TIAN Shuai2,3, LIU Zhen-bao2, LIANG Jian-xiong2 |
1. Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming 650000, Yunnan, China;
2. Institute of Special Steels, Central Iron and Steel Research Institute,Beijing 100081, China;
3. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210000, Jiangsu, China |
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Abstract In order to study the effect of smelting processs on the fatigue properties of 15-5PH stainless steel,the effects of smelting process on the particle size distribution and fatigue properties of inclusions in 15-5PH stainless steel were studied by ASPEX inclusion analysis,tensile fatigue test,scanning electron microscopy and crack growth rate experiments. The crack growth rates of the two test steels were also compared. The results showed that No.1 test steel smelted by VIM+VAR process had lower total oxygen mass percent,smaller inclusion size and less mass percent. The fatigue strength of No.1 test steel was 30 MPa higher than that of No.2 test steel smelted by single vacuum process. By means of SEM observation of fatigue fracture,No.1 test steel cracked on the surface matrix,and the crack source of No.2 test steel was subsurface Al2O3 inclusion. Under the same conditions,the crack growth rate of No.1 test steel was faster than No.2 test steel.
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Received: 18 March 2019
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2020, Vol. 55 
