Study on Precipitation Hardening of C 250 Grade Maraging Steel
Study on Precipitation Hardening of C 250 Grade Maraging Steel
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C 250级马氏体时效钢沉淀硬化研究
DOI：
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发表时间：
2017
影响因子：
1.6
通讯作者：
M. Ghosh
中科院分区：
文献类型：
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作者：
Gaurav Singh;M. Ghosh
研究了不同热处理工艺对C250马氏体时效钢显微组织和硬度的影响。进行了不同的热处理工艺，并对所得的显微组织和硬度进行了表征。采用了各种结构表征技术，如光学显微镜、扫描电子显微镜、X射线衍射、差示扫描量热法等，并将由此评价的显微结构特征与机械性能（即硬度）相关联。固溶时效合金中板条马氏体基体中存在Ni_3（Ti，Mo）相。研究发现，常规马氏体时效处理（850 °C固溶处理，随后强制空冷，最后500 °C时效）的硬化效果最好。晶粒细化技术对提高马氏体时效钢时效硬化状态下的硬度效果不明显。
The present work reports effect of different heat treatment processes on the microstructure and hardness of C 250 grade maraging steel. Different heat treatment processes have been carried out and the resultant microstructure and hardeness have been characterized. Various structural characterization techniques, such as, optical microscopy, scanning electron microscopy, X-ray diffraction, differential scanning calorimetry, etc. have been adopted and the microstructural features thus evaluated have been correlated with the mechanical property, viz. hardness. Presence of Ni3(Ti,Mo) particles in lath martensitic matrix are revealed in solution treated and aged alloy. It is found that conventional maraging treatment consisting of solution treatment at 850 °C, followed by forced air cooling and finally ageing at 500 °C gives the best hardening response. Grain refinement techniques are not much effective for the improvement of hardness of maraging steel in the age hardened condition.