Evolution of microstructure and mechanical properties for 9Cr18 stainless steel during thixoforming |
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| Affiliation: | 1. Atomic & Molecular Physics Division, Bhabha Atomic Research Centre, VIZAG Centre, Visakhapatnam 530 012, India;2. Homi Bhabha National Institute, Anushaktinagar, Mumbai 400 094, India;3. Advanced Laser and Optics Division, Raja Ramanna Centre for Advanced Technology, Indore 452013, India;4. Atomic & Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India;1. Raja Ramanna Centre for Advanced Technology, Indore 452013, India;2. Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India;3. Metallurgical Engg. & Materials Science Department, Indian Institute of Technology Bombay, Mumbai 400076, India;1. Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, PR China;2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, PR China;3. New Land Bearing Co., Ltd., Ningbo, 315300, PR China;4. CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, PR China |
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| Abstract: | Hot compression tests were carried out in the semi-solid state of 9Cr18 stainless steel on Gleeble-1500 thermal simulation testing machine to investigate the effects of thixoforming parameters on its microstructure and mechanical properties. In this paper, microstructure was observed by scanning electron microscopy (SEM) and analyzed using energy dispersive spectrometer (EDS), and true stress–stain curves of the specimens with different initial microstructures after thixoforming were obtained to study the deformation mechanism. The results showed that thixoforming parameters such as reheating temperature and the strain rate had a significant influence on microstructure and mechanical properties evolution of 9Cr18 semi-solid billet. With increasing reheating temperature or decreasing strain rate, average size of carbides decreased from 2 μm to 0.5 μm, and the phenomenon of liquid extrusion during thixoforming became more obvious. During thixoforming, carbon atoms diffused to molten metal from austenite in the centre of specimens. When thixoforming temperature reached 1300 °C, martensitic transformation occurred after rapid cooling. Flow stress of semi-solid billet was lower than traditional ingot casting and hot rolled state steel, when reheated to the semi-solid range, due to their different original microstructure. |
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| Keywords: | Stainless steel Thixoforming Microstructure Deformation mechanism |
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