Materials Reports  2020, Vol. 34 Issue (Z1): 452-456 |
| METALS AND METAL MATRIX COMPOSITES |
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| Correlation of Fracture Toughness with Microstructure in MicroalloyedMedium Carbon Steel |
| YAO Sancheng1,2, DING Yi3, ZHAO Hai1,2, JIANG Bo1,2, LIU Xuehua1,2, FANG Zheng1,2
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1 Anhui Province Key Laboratory of High-performance Rail Transportation New Materials and Safety Control, Ma'anshan 243000, China;
2 Technology Center, Ma'anshan Iron & Steel Co., Ltd., Ma'anshan 243000, China;
3 Magang (Group) Holding Co., Ltd., Ma'anshan 243000, China |
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Abstract The fracture toughness and hardness of 50Mn steel containing 0.10% (mass fraction) vanadium were tested. The microstructure was observed by using the quantitative metallography, electron probe microanalysis (EPMA), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and the correlation of fracture toughness with microstructure was established. The results indicate that cleavage fracture toughness is negatively correlated with prior austenite grain size, the refinement and homogenization of the grains can improve significantly the fracture toughness, which can be used as an important microstructural parameter unit to control the strength and toughness of microalloyed medium carbon steel. The fine and uniform grains and insoluble secondary phases also increase the nucleation sites for ferrite, thus increasing the volume fraction of proeutectoid ferrite, and further enhancing the cracks propagation resistance.
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Published: 01 July 2020
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| Fund:This work was financially supported by the Major Science and Technology Projects in Anhui Province (201903a05020052). |
| About author:: Sancheng Yao, born in Aug. 1991, received his master's degree in materials engineering from Central South University in 2016, and now he works in Technology Center, Ma'anshan Iron & ; Steel Co., Ltd., mainly engages in the R& ; D of key components for rail transit. He has published 8 journal papers and applied 9 national invention patents and 4 of them were authorized. |
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