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Relation of small punch creep test properties with microstructure changes for an ASTM A387 Cr-Mo steel

机译：ASTM A387 Cr-Mo钢的小冲头蠕变测试性能与组织变化之间的关系

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摘要

The creep properties of ASTM A387 5Cr-0.5Mo steel, grade 5 and class 2, were evaluated by the Small-Punch Creep test. Small-Punch creep tests were carried out at 550 and 600 degrees C with loads of 67-133 N under an argon atmosphere. Specimens were tested in the as-received and 600 degrees C-aged conditions. The analysis of creep curves by Norton's law indicated n exponent values between 8.1 and 12, which suggested that the creep deformation occurred by the transgranular deformation of the ferrite matrix originating a transgranular ductile-fracture mode in tested specimens. The difference of n exponent between the as-received specimens tested at 550 and 600 degrees C can be related to the different microconstituent and precipitation evolution during testing. In contrast, the isothermal 600 degrees C-aging of specimens prior to testing at 600 degrees C promoted shorter time-to-rupture and higher n exponents, in comparison to the as-received specimens tested at the same temperature, because of the coarsening process of M23C6 carbides.
机译：通过Small-Punch蠕变测试评估了5级和2级ASTM A387 5Cr-0.5Mo钢的蠕变性能。在氩气气氛下于550和600摄氏度，负荷67-133 N的条件下进行了小打孔蠕变测试。样品在接收时和600摄氏度的条件下进行了测试。根据诺顿定律对蠕变曲线的分析表明，n指数值介于8.1和12之间，这表明蠕变变形是由铁氧体基体的跨晶形变形引起的，而该变形是由试样中的跨晶延性断裂模式引起的。在550和600摄氏度下测试的原样之间n指数的差异可能与测试过程中不同的微成分和降水演变有关。相比之下，与在相同温度下测试的原样相比，在600℃下进行测试之前，样品在600℃下进行等温600℃时效时，其破裂时间更短，n指数更高，这是由于其粗化过程M23C6碳化物。

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