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首页> 外文期刊>Materials transactions >Characterization of Mechanical Properties for Ferritic Heat-Resisting Steels (12Cr-2W) with Different Creep-Fatigue Properties by Nano-Indentation
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Characterization of Mechanical Properties for Ferritic Heat-Resisting Steels (12Cr-2W) with Different Creep-Fatigue Properties by Nano-Indentation

机译：用纳米缩进的不同蠕变疲劳性能的铁素体耐热钢（12Cr-2W）的力学性能表征

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摘要

Quantitative mechanical analyses by nano indentation were performed for two types of ferritic heat-resisting steel that contained 12 mass% chromium and 2 mass% tungsten (12Cr-2W). One of the 12Cr-2W with a superior creep-fatigue property showed transgranular fractures, whereas the other steel with an inferior creep-fatigue property did intergranular fractures. In the inferior steel, coarse subgrains in the coarse blocks neighboring the prior austenite grain boundaries were formed during the creep-fatigue testing. Nano-scale hardness of the coarse subgrains or blocks neighboring the grain boundaries were markedly lower than those of the fine blocks far from the grain boundaries after the creep-fatigue test. Moreover, a pop-in behavior (in the relationship between force and penetration depth) occurred at only the coarse blocks neighboring the prior austenite grain boundaries. The pop-in behavior indicates that the dislocation density in the coarse blocks should be extremely lower by the recovery or rearrangement of dislocation by the creep-fatigue process at high-temperature. Therefore local deformations were assisted in the coarse blocks neighboring to grain boundaries and introduce the intergranular fractures.
机译：对纳米压痕进行定量机械分析，用于两种类型的铁素体耐热钢，其包含12质量％铬和2质量％钨（12Cr-2W）。 12Cr-2w中的一种具有优异的蠕变 - 疲劳性能显示骨折骨折，而另一钢具有较差的蠕变疲劳性能进行骨间骨折。在较差的钢中，在蠕变 - 疲劳试验期间形成相邻的粗块中的粗块中的粗细分。粗糙的叶片边界的粗叶片或块的纳米级硬度明显低于蠕变 - 疲劳试验后远离晶界的细块的硬度。此外，仅在邻近先前奥氏体晶界相邻的粗块时发生弹出行为（在力和渗透深度之间的关系中）。弹出行为表明粗块中的位错密度应通过高温下的蠕变 - 疲劳过程的脱位恢复或重排来极低。因此，局部变形辅助围绕晶界的粗块并引入晶间骨折。

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