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老化厚截面奥氏体不锈钢的高温疲劳

High Temperature Fatigue of Aged Heavy Section Austenitic Stainless Steels.

作者信息

Wärner Hugo, Chai Guocai, Moverare Johan, Calmunger Mattias

机构信息

Department of Management and Engineering, Linköping University, 58183 Linköping, Sweden.

AB Sandvik Materials Technology R and D Center, 81181 Sandviken, Sweden.

出版信息

Materials (Basel). 2021 Dec 23;15(1):84. doi: 10.3390/ma15010084.

DOI:10.3390/ma15010084
PMID:35009228
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8746278/
Abstract

This work investigates two austenitic stainless steels, Sanicro 25 which is a candidate for high temperature heavy section components of future power plants and Esshete 1250 which is used as a reference material. The alloys were subjected to out-of-phase (OP) thermomechanical fatigue (TMF) testing under strain-control in the temperature range of 100 ∘C to 650 ∘C. Both unaged and aged (650 ∘C, 3000 h) TMF specimens were tested to simulate service degradation resulting from long-term usage. The scanning electron microscopy methods electron backscatter diffraction (EBSD) and energy dispersive spectroscopy (EDS) were used to analyse and discuss active failure and deformation mechanisms. The Sanicro 25 results show that the aged specimens suffered increased plastic straining and shorter TMF-life compared to the unaged specimens. The difference in TMF-life of the two test conditions was attributed to an accelerated microstructural evolution that provided decreased the effectiveness for impeding dislocation motion. Ageing did not affect the OP-TMF life of the reference material, Esshete 1250. However, the structural stability and its resistance for cyclic deformation was greatly reduced due to coarsening and cracking of the strengthening niobium carbide precipitates. Sanicro 25 showed the higher structural stability during OP-TMF testing compare with the reference material.

摘要

本研究调查了两种奥氏体不锈钢，即Sanicro 25（未来发电厂高温厚壁部件的候选材料）和Esshete 1250（用作参考材料）。在100℃至650℃的温度范围内，对这些合金进行了应变控制下的异相（OP）热机械疲劳（TMF）测试。对未时效和时效（650℃，3000小时）的TMF试样均进行了测试，以模拟长期使用导致的服役退化。采用扫描电子显微镜方法中的电子背散射衍射（EBSD）和能谱分析（EDS）来分析和讨论失效及变形机制。Sanicro 25的测试结果表明，与未时效试样相比，时效试样的塑性应变增加，TMF寿命缩短。两种测试条件下TMF寿命的差异归因于微观结构演变加速，这降低了阻碍位错运动的有效性。时效并未影响参考材料Esshete 1250的OP-TMF寿命。然而，由于强化碳化铌析出物的粗化和开裂，其结构稳定性及其对循环变形的抗力大大降低。与参考材料相比，Sanicro 25在OP-TMF测试中表现出更高的结构稳定性。

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本文引用的文献

1
Precipitation within localised chromium-enriched regions in a Type 316H austenitic stainless steel.316H型奥氏体不锈钢中局部富铬区域内的析出物。
J Mater Sci. 2018;53(8):6183-6197. doi: 10.1007/s10853-017-1748-4. Epub 2018 Jan 9.