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首页> 外文期刊>Materials at High Temperatures >Microstructures and high-temperature mechanical properties in 9Cr-0.5Mo-1.8WVNb steel after aging at 650 degrees C
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Microstructures and high-temperature mechanical properties in 9Cr-0.5Mo-1.8WVNb steel after aging at 650 degrees C

机译：650℃时效后9Cr-0.5Mo-1.8WVNb钢的组织和高温力学性能

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摘要

A series of experiments, including post-aged tensile tests, charpy impact tests, Vickers hardness test, scanning electron microscopy (SEM) examinations and transmission electron microscopy (TEM) observations, were carried out to investigate the microstructure evolution and high-temperature mechanical properties of P92 steel. Experimental results show that martensitic lath structure gradually recovers during long-term aging; meanwhile, the content and size of spheroidal M23C6 together with Laves phase distributed mainly along prior austenite grain boundaries and subgrain boundaries increase with extending the aging time, but MX in grain interior seems to be stable. The strength parameters (sigma(ys) and sigma(ult)), the ductile parameters (delta and Phi(f)) and high-temperature impact absorbed energy all show an initially slight increase followed by a decrease with the increase of the aging time up to 500 h. After aging for 2000 h at 650 degrees C, this degradation behaviour becomes stable, although the Vickers hardness is not strongly affected by the aging time. Based on the microstructural observations and high-temperature mechanical properties, the strengthening mechanism of P92 steel was discussed.
机译：进行了一系列试验，包括后老化拉伸试验，夏比冲击试验，维氏硬度试验，扫描电子显微镜（SEM）检查和透射电子显微镜（TEM）观察，以研究组织的演变和高温机械性能。 P92钢。实验结果表明，马氏体板条结构在长期时效过程中逐渐恢复。同时，随着时效时间的延长，球状M23C6的含量和尺寸以及主要沿原奥氏体晶界和亚晶界分布的Laves相随着时效时间的延长而增加，但晶粒内部的MX似乎是稳定的。强度参数（σs（ys）和sigma（ult）），延性参数（delta和Phi（f））以及高温冲击吸收能量都显示出最初的轻微增加，然后随着老化时间的增加而减小长达500小时尽管维氏硬度不受老化时间的强烈影响，但在650摄氏度下老化2000小时后，这种降解行为变得稳定。基于显微组织观察和高温力学性能，探讨了P92钢的强化机理。

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