Comparative study on microstructures and properties of Mn-containing and Mn-free bainitic steels |
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| Authors: | Xiaoyan Long Ruijie Zhang Ming Zhang |
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| Affiliation: | 1. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, People’s Republic of China;2. Key Laboratory of Mechanical Reliability for Heavy Equipments and Large Structures of Hebei Province, Yanshan University, Qinhuangdao, People’s Republic of China;3. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, People’s Republic of China |
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| Abstract: | ABSTRACT The effects of Mn on the microstructure and impact-abrasion wear resistance of bainitic steel were studied. Results showed that the Mn-containing steel possessed finer microstructure and higher volume fraction of retained austenite, in comparison with the Mn-free steel. This was caused by lower transformation temperature and higher strength of undercooled austenite. The weight loss of Mn-free steel varying with the impact load was larger than that of Mn-containing steel. High strength, hardness and toughness of Mn-containing steel were conducive to improving wear resistance. More retained austenite in Mn-containing steel played an active role in work hardening and hindering crack propagation. However, the portion of retained austenite that induced martensitic transformation was the same with increasing impact-wear load. |
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| Keywords: | Bainitic steel Mn content microstructure impact-abrasion wear resistance |
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