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| Effect of Structure Refining on Mechanical Properties of Medium Carbon CrMo Steel |
| ZHANG Junfen1,2,SHI Jie2,SHI Zhe1,CHEN Rong3 |
| 1. Science and Technology Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technology, Kunming 650093， Yunnan, China;2. Institute for Structure Materials of CISRI, Beijing 100081, China;3. China Ordins Corporation, China Norinco Group, Beijing 100089, China |
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Abstract The effect of austenite grain size, which was obtained by changing the austenitizing temperature and using repeated heat treatment, on mechanical properties of quenched and tempered medium carbon CrMo steel was studied. The results show that with increasing austenitizing temperature to 1050 ℃, the strength increases. But with same austenitizing temperature, strength and impact toughness of steel increase with decreasing the austenite grain size, while ductility decreases as austenite grain size decreases. Low temperature toughness is remarkably improved by grain refinement.
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Received: 01 January 1900
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2006, Vol. 41 