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首页> 外文期刊>Materials Characterization >Characterization of precipitates in a 7.9Cr-1.65Mo-1.25Si-1.2V steel during tempering
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Characterization of precipitates in a 7.9Cr-1.65Mo-1.25Si-1.2V steel during tempering

机译：回火过程中7.9Cr-1.65Mo-1.25Si-1.2V钢中析出物的表征

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摘要

In this paper, the precipitates formed during the tempering after quenching from temperature 1150 deg C for 7.90Cr-1.65Mo-1.25Si-1.2V steels are investigated using an analytical transmission electron microscope (A-TEM).The study of this tempering is carried out in isothermal and anisothermal conditions, by comparing the results given by dilatometry and hot hardness. Tempering is performed in the range of 300-700 deg C. Coarse primary carbides retained after heat treatment are V-rich MC and Cr-Mo-rich M_C_3 types. In turn, it gives a significant influence on the precipitation of fine secondary carbides, that is, secondary hardening during tempering. The major secondary carbides are Cr-Mo-V-rich M'C (and/or) Cr-Mo-rich M_2C type. The peak hardness is observed in the tempering range of 450-500 deg C. In the end, we observe between 600 and 700 °C, that this impoverished changes the phase. At these high temperatures of tempering, we observe that there is a carbide formation of the types M_6C developing at the expense of the fine M_7C_3 carbides previously formed.
机译：本文使用分析型透射电子显微镜（A-TEM）研究了7.90Cr-1.65Mo-1.25Si-1.2V钢在1150℃温度下淬火后在回火过程中形成的析出物。通过比较膨胀法和热硬度给出的结果，在等温和等温条件下进行。在300-700摄氏度范围内进行回火。热处理后保留的粗大一次碳化物为富V的MC和富Cr-Mo的M_C_3类型。反过来，它对细小的二次碳化物的析出也具有重大影响，即回火过程中的二次硬化。主要的次生碳化物是富Cr-Mo-V的M'C（和/或富Cr-Mo的M_2C型）。在450-500摄氏度的回火范围内观察到了峰值硬度。最后，我们观察到600至700摄氏度之间的温度差，这改变了相。在这样高的回火温度下，我们观察到，以先前形成的细M_7C_3碳化物为代价，形成了M_6C类型的碳化物形成。

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