The Role of Prior Fabrication and in Service Thermal Ageing on the Creep Life of AISI Type 316 Stainless Steel Components
The Role of Prior Fabrication and in Service Thermal Ageing on the Creep Life of AISI Type 316 Stainless Steel Components
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预先制造和使用中热老化对 AISI 316 型不锈钢部件蠕变寿命的影响
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
P. Flewitt
中科院分区：
文献类型：
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作者：
A. Martinez;A. Warren;I. Griffiths;P. Flewitt
影响集箱、管子等AISI316H型奥氏体不锈钢部件蠕变寿命的一个重要因素是初始组织。这些部件通常具有可比的特定成分，但具有不同的热机械制造历史。成分在标称范围内的变化导致初始显微组织在时效过程中变得越来越不同。在本文中，我们探讨了这些贡献对长期服役时效组织的影响，并讨论了由此对这些部件的整体蠕变寿命的影响。用一系列技术表征了特定区域的微观结构，包括使用JEOL ARM仪器进行的高分辨率电子显微镜成像和化学分析，该仪器的工作电压为200keV，配备了能量色散光谱仪。这为服役时效析出物以及合金化和杂质元素的分布提供了唯一的识别。结合AISI316H型奥氏体不锈钢锅炉部件的寿命评估，讨论了蠕变空洞的萌生和蠕变损伤的累积。
A significant factor that influences the creep life of AISI Type 316H austenitic stainless steel components such as headers, and tubes is the initial microstructure. These components typically have a comparable specified composition but different thermo-mechanical fabrication histories. The variations in composition within the nominal range result in initial microstructures which become increasingly divergent during ageing. In this paper we explore effect of these contributions on the long term service aged microstructure and discuss the resulting impact on the overall creep life of these components. The microstructure of specific regions has been characterised with a range of techniques, including high resolution transmission electron microscopy imaging and chemical analyses undertaken using a JEOL ARM instrument operating at 200 KeV fitted with an energy dispersive spectrometer. This provides a unique identification of the service aged precipitates and the distribution of alloying and impurity elements. The results are discussed with respect to the initiation of creep cavities and the associated creep damage accumulation in the context of lifetime assessment of these AISI Type 316H austenitic stainless steel boiler components.