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首页> 外文期刊>Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science >Effect of Boron Addition and Initial Heat-Treatment Temperature on Microstructure and Mechanical Properties of Modified 9Cr-1Mo Steels Under Different Heat-Treatment Conditions
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Effect of Boron Addition and Initial Heat-Treatment Temperature on Microstructure and Mechanical Properties of Modified 9Cr-1Mo Steels Under Different Heat-Treatment Conditions

机译：硼添加量和初始热处理温度对不同热处理条件下改性9Cr-1Mo钢组织和力学性能的影响

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摘要

The effect of initial heat treatment on microstructure and mechanical properties of boron-free and boron-containing modified 9Cr-1Mo steel (P91 and P91B, respectively) has been studied under different heat-treatment conditions. The prior austenite grains evolved in P91 steel, having different prior austenite grain sizes, were found to be similar in size after heat treatment in the range of 1073 K to 1448 K (800 °C to 1175 °C) for 5 minutes. The microstructural evolution in P91B steel having different prior austenite grain sizes appeared to be uniform when subjected to different heat-treatment temperatures with the prior austenite grain size being similar to that of initial grain size. Lath martensite was observed in P91B steel after all heat treatments. On the other hand, lath martensite was observed in P91 steel only when subjected to high-temperature heat treatment, whereas subgrain/substructure as well as coarse precipitates were observed after a lower temperature heat treatment. Large differences in the hardness/ strength values between different microstructures corresponding to coarse-grained heat-affected zone (CGHAZ) and intercritical HAZ (ICHAZ) of P91 steel weldment were due to the distinct difference in these microstructures. The difference in hardness/strength values between the CGHAZ and ICHAZ was found to be insignificant in P91B steel under similar heat-treatment conditions.
机译：研究了在不同热处理条件下初始热处理对无硼和含硼改性9Cr-1Mo钢（分别为P91和P91B）的组织和力学性能的影响。发现在P91钢中析出的原始奥氏体晶粒具有不同的原始奥氏体晶粒尺寸，经1073 K至1448 K（800°C至1175°C）热处理5分钟后，晶粒尺寸相似。具有不同奥氏体晶粒尺寸的P91B钢，在经受不同的热处理温度时，其微观组织演变似乎是均匀的，其原始奥氏体晶粒尺寸与初始晶粒尺寸相似。经过所有热处理后，在P91B钢中观察到板条马氏体。另一方面，仅当进行高温热处理时，在P91钢中观察到板条马氏体，而在较低温度热处理后，观察到亚晶粒/亚结构以及粗大的析出物。 P91钢焊件的对应于粗晶粒热影响区（CGHAZ）和临界间热影响区（ICHAZ）的不同显微组织之间的硬度/强度值差异很大。发现在相似的热处理条件下，CGHAZ和ICHAZ之间的硬度/强度值差异在P91B钢中微不足道。

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