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Creep deformation and rupture behaviour of thermal aged P92 steel

机译：热时效P92钢的蠕变变形和断裂行为

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摘要

Creep deformation and rupture behaviour of thermal aged P92 steel have been investigated over a stress range of 110-130 MPa at 923 K. Laves phase was observed in the thermal aged steel. Laves phase predominantly coarsens towards the intra-lath region assisted by substructure within the lath region. The stress dependence of minimum creep rate followed Norton's power law of creep with comparable apparent stress exponent value in the thermal aged, and normalised and tempered steels. The creep rate and creep rupture lives of both the steels were relatively comparable under lower stress level. The steel obeyed Monkman-Grant and modified Monkman-Grant ductility relationships. Enhanced precipitation of Laves phase has been observed at the necked region in both the conditions of the steel, which experienced higher plastic flow. Thermal aging of P92 steel has not significantly influenced the creep strength under longer creep duration.
机译：已经研究了在923 K的110-130 MPa应力范围内热时效P92钢的蠕变变形和断裂行为。在热时效钢中观察到Laves相。 Laves相主要在板条区域内的子结构的协助下向板条内部区域变粗。最小蠕变速率的应力依赖性遵循诺顿蠕变幂定律，在热时效，正火和回火钢中，表观应力指数具有可比性。在较低的应力水平下，两种钢的蠕变速率和蠕变断裂寿命相对可比。该钢服从了蒙克曼-格兰特（Monkman-Grant）和修改后的Monkman-Grant延性关系。在两种钢的颈缩区域都观察到拉夫斯相的析出量增加，而塑性较高。在较长的蠕变持续时间下，P92钢的热时效不会显着影响蠕变强度。

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