Precipitation Behavior of Carbides in H13 Hot Work Die Steel and Its Strengthening during Tempering
Precipitation Behavior of Carbides in H13 Hot Work Die Steel and Its Strengthening during Tempering
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H13热作模具钢中碳化物的析出行为及其回火强化
DOI：
10.3390/met7030070
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发表时间：
2017-03-01
期刊：
影响因子：
2.9
通讯作者：
Guo, Jing
中科院分区：
文献类型：
--
作者：
Ning, Angang;Mao, Wenwen;Guo, Jing
采用光学显微镜、透射电子显微镜、电子衍射和X射线能谱分析等方法研究了H13热作模具钢中碳化物的形貌、尺寸和类型，并利用Image-Pro Plus软件分析了回火后钢锭内不同位置碳化物的尺寸分布和数量。热力学计算也进行了这些碳化物。靠近铸锭表面的显微组织均匀，具有细长的马氏体板条。在H13中检测到两种类型的碳化物沉淀：（1）MC和M6 C，通常小于200 nm;和（2）M23 C6，通常大于200 nm。MC和M6 C在沉淀硬化中起主要作用。这些是最常见的碳化物沉淀在中间点从锭的中心，和最不常见的表面。从铸锭中心到表面，碳化物的尺寸和体积分数减小，韧性提高，而碳化物对屈服强度的贡献增大。
The properties of carbides, such as morphology, size, and type, in H13 hot work die steel were studied with optical microscopy, transmission electron microscopy, electron diffraction, and energy dispersive X-ray analysis; their size distribution and quantity after tempering, at different positions within the ingot, were analyzed using Image-Pro Plus software. Thermodynamic calculations were also performed for these carbides. The microstructures near the ingot surface were homogeneous and had slender martensite laths. Two kinds of carbide precipitates have been detected in H13: (1) MC and M6C, generally smaller than 200 nm; and (2) M23C6, usually larger than 200 nm. MC and M6C play the key role in precipitation hardening. These are the most frequent carbides precipitating at the halfway point from the center of the ingot, and the least frequent at the surface. From the center of the ingot to its surface, the size and volume fraction of the carbides decrease, and the toughness improves, while the contribution of the carbides to the yield strength increases.