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首页> 外文期刊>Materials at High Temperatures >Creep deformation and rupture behaviour of service exposed P91 weld and base steel measured by miniature tensile creep testing
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Creep deformation and rupture behaviour of service exposed P91 weld and base steel measured by miniature tensile creep testing

机译：通过微型拉伸蠕变试验测量的服务暴露的蠕变变形和防爆行为暴露的P91焊接和基础钢

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Early cracking had occurred at a weld joint of a service-exposed P91 steel hot reheat pipe branch. In this study, a series of miniature tensile creep tests were conducted for both the base and weld materials extracted from the retired P91 pipe weld. Tests were conducted at various stress levels at 569 degrees C to measure the creep properties and investigate the failure mechanisms. Microstructural analyses were also carried out for post-test specimens. The measured creep strengths were represented in terms of the Larson-Miller parameter, and compared to literature data. Most of the data fell within the 95% error band of grade 91 steel. However, the weld metal exhibited higher creep rupture strengths. It showed creep brittle fracture, and base metal showed creep ductile behaviour. The weld metal sometimes had non-uniform microstructures, yielding a seriously tempered zones with minor tempered martensites, thereby causing early creep ductile failure of the weld.
机译：早期开裂发生在经营过的P91钢热再加热管分支的焊接接头处。 在该研究中，为从退出的P91管道焊接中提取的基础和焊接材料进行了一系列微型拉伸蠕变试验。 在569℃下在各种应力水平下进行测试，以测量蠕变性能并研究失效机制。 测试后标本也进行了微观结构分析。 测量的蠕变强度在Larson-Miller参数方面表示，并与文献数据相比。 大多数数据落在91级钢材的95％误差带内。 然而，焊接金属具有较高的蠕变破裂强度。 它显示蠕变脆性骨折，基础金属显示蠕变的延展性行为。 焊接金属有时具有非均匀的微观结构，产生具有次要回火马氏体的严重脾气区，从而导致焊接的早期蠕变延性失效。

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