Materials Reports  2020, Vol. 34 Issue (Z1): 440-443 |
| METALS AND METAL MATRIX COMPOSITES |
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| Effect of V on Phase Transformation Characteristic of H13 Die-casting Die Steel |
| ZHENG Mingda, WU Hongqing, ZUO Pengpeng, WU Xiaochun
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| School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China |
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Abstract The continuous cooling transformation (CCT)curves and time temperature transformation (TTT) curves of H13 die-casting die steels with different mass fractions of V were measured by dilatometry. The effects of V on the phase transformation points (Ac1, Accm and Ms) CCT curves, TTT curves and hardness of H13 die-casting die steels with different mass fractions of V were studied by scanning electron microscopy (SEM), Vickers hardness test and X-ray diffractometer (XRD).The results show that the Ms of H13 significantly increase, pearlite and bainite phase regions in CCT curves and TTT curves shift to the left, critical cooling rate of pearlite and bainite phase regions in the CCT curves increase, and the quenched hardness decreases with the increase in mass fraction of V. Subsequently, our work also explored the mechanism about the effect of different mass fractions of V on the phase transformation characteristic. It can been seen that more stable V-based carbides are formed with the increase in mass fraction of V, which reduce the carbon content dissolved in the matrix during the complete austenitizing process, and then reduce the stability of the undercooled austenite. Eventually, the pearlite and bainite transformations are promoted, which means the pearlite and bainite phase regions in the CCT curves and TTT curves are shifted to the left.
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Published: 01 July 2020
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| Fund:This work was financially supported by the National Key R&D Program of China (2016YFB0300400, 2016YFB0300402). |
| About author:: Mingda Zheng received postgraduate degree in material processing engineering from the Shanghai University in Sep. 2017—Jun. 2020. His research interests focus on development of advanced die materials and surface treatment ; Xiaochun Wu is a professor and doctoral supervisor of Shanghai University. In recent years, more than 110 die-related scientific research projects have been completed (scientific research funds reached more than 83 million yuan). He has published more than 350 journal papers, and 20 national invention patents were autho-rized. He has won three second-class prizes for provincial and mi-nisterial level scientific and technological progress. He is the chief expert of the “Eleventh Five-Year” National Science and Technology Support Program “Key Technology Development of High Quality Die Steel Forging Materials” and “High Performance Tool Steel and Application” project of “13th Five-Year” National Key R & ; D Project. |
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