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Influence of on-line tempering parameters on microstructure of medium-carbon steel

Journal of Iron and steel Research International 2017年第1期24卷 59-66页

作者： Hua Zhang Yan-xin Wu Jian-xun Fu Jie Xu Qi-jie Zhai State Key Laboratory of Advanced Special steel Shanghai UniversityShanghai 200072China

A new process involving ultra-fast cooling（UFC）and on-line tempering（OLT）was proposed to displace austempering process,which usually implements in a salt/lead bath and brings out serious pollution in the industrial *** optimization of the new process,involving the evolution of the microstructure of medium-carbon steel during various cooling paths,was *** results show that the cooling path affected the final microstructure in terms of the fraction of pearlite,grain size and distribution of cementite in *** the cooling rate or decreasing the OLT temperature contributes to restraining the transformation from austenite to ferrite,and simultaneously retains more austenite for the transformation of *** is also noted that bainite was observed in the microstructure at the cooling rate of 45℃/s and the OLT temperature of 500℃.Through either increasing the cooling rate or decreasing the OLT temperature,the distribution of cementite in pearlite is more dispersed and grain is *** the possibility of industrial applications into account,the optimal process of cooling at 45℃/s followed by OLT at 600℃ after hot rolling was determined,which achieves a microstructure containing nearly full pearlite with an average grain size of approximately 7μm and a homogeneously dispersed distribution of cementite in pearlite.

关键词： medium-carbon steel Ultra-fast cooling On-line tempering Phase transformation kinetics

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Development of Microalloyed medium-carbon steel with Improved Toughness

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Journal of Iron and steel Research International 1996年第1期3卷 37-42页

作者： Wang Qi Li Guifen Dong Han Central Iron and steel Research Institute MMI

The application of the hot-rolled micronlloyed medium-carbon steel is limited due to its lower toughness compared with quenched and tempered steels.A high strength microalloyed medium-carbon steel has been developed to meet the increasing demand for eliminating heat *** effects of chemical compositions,hot-deforming temperatures and cooling rates after hot-deforming on mechanical properties of the steel were *** was given to the steel toughness above the required value for safety components in *** basic microstructural variables controlling the properties were *** is demonstrated that toughness and machinability can be improved through the addition of 0.5%Si,0.5%S and 0.01%*** can be further improved by controlling hot-deforming temperature and subsequent cooling rate.

关键词： microalloyed steel medium-carbon steel toughness hot-deforming temperature cooling rate

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