Mechanism exploration of an ultrahigh strength steel by quenching–partitioning–tempering process
Mechanism exploration of an ultrahigh strength steel by quenching–partitioning–tempering process
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DOI：
10.1016/j.msea.2011.08.050
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发表时间：
2011-11
期刊：
影响因子：
6.4
通讯作者：
X. Wang;Zhenghong Guo;Y. Rong
中科院分区：
文献类型：
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作者：
X. Wang;Zhenghong Guo;Y. Rong
研究了不同热处理工艺对铌微合金钢力学性能的影响。采用扫描电子显微镜（SEM）、电子背散射衍射（EBSD）成图装置和透射电子显微镜（TEM）对经过淬火-配分-回火（Q-P-T）两步工艺后强延性匹配较好的试样进行进一步的显微组织表征。结果表明：Q-P-T 2步试样具有多相、多尺度的优化组织，即板条马氏体（厚度为亚微米级）、残余奥氏体（片间膜状体厚度为纳米级，岛状体直径为亚微米级）和碳化物沉淀（直径为纳米级），具有最佳的力学性能。这种微观结构特征被称为多相亚稳多尺度（3M）结构。提出了3M显微组织的概念来解释Q-P-T钢具有良好力学性能的原因。
The mechanical property of a Nb-microalloyed steel with different heat treatment processes are investigated. The sample with good strengthening-ductility match after quenching–partitioning–tempering (Q–P–T) 2-step process is selected as further microstructure characterization by means of scanning electron microscope (SEM) equipped with electron backscattered diffraction (EBSD) mapping device and transmission electron microscope (TEM). The results indicate that the Q–P–T 2-step sample shows best mechanical property due to its optimized microstructure with multiphase and multiscale, i.e., lath martensite (submicron-scale in thickness), retained austenite (nano-scale in thickness for interlath film-like type and submicron in diameter for island-like type) and carbide precipitates (nano-scale in diameter). This microstructure feature is named as multiphase-metastable-multiscale (3M) configuration. The idea of the 3M microstructure is proposed to explain the reason why Q–P–T steels possess good mechanical properties.