Materials Reports  2019, Vol. 33 Issue (z1): 386-391 |
| METALS AND METAL MATRIX COMPOSITES |
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| Effect of Carbon Content on the Continuous Cooling Transformation Characteristics of Cr-Mo-V Die Steel |
| QIU Ling1,2, WU Hongqing1,2, ZHANG Le1,2, WU Xiaochun2
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1 School of Materials Science and Engineering, Shanghai University, Shanghai 200444
2 State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200444 |
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Abstract The continuous cooling transformation (CCT) diagrams of Cr-Mo-V die steels with different carbon contents (0.36%, 0.46% and 0.74%) were measured by dilatometry. The effects of carbon on the CCT diagrams, microstructure and hardness of Cr-Mo-V die steels were studied by optical microscopy (OM), scanning electron microscopy (SEM) and Vickers hardness test. The results show that the Cr-Mo-V die steels with different carbon contents have almost the same Ac1 temperature, Accm and Ms temperatures are decreased obviously. The Accm temperatures of 0.46C and 0.74C steels are decreased by 24 ℃ and 62 ℃, and the Ms temperatures are decreased by 39 ℃ and 109 ℃ compared to 0.36C steel, respectively. Three die steels appear pearlitic transformation, bainite transformation and martensitic transformation when austenited at 1 030 ℃. With the increasing of carbon content, the undissolved carbide content increases, the phase regions of pearlite and bainite in CCT curves shift to the left, the critical cooling rates of the complete martensite increase and the microhardness increases.
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Published: 05 July 2019
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| About author:: Ling Qiu received his postgraduate degree in material processing engineering from the Shanghai University in Sep. 2016—Jun. 2019. He has published 2 journal papers as the first author. 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 ministerial 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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