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基于ASME规范案例N-898的617合金棘轮评价方法对比研究
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Abstract:
617合金是一种高温镍基材料，具有耐高温、耐腐蚀等优异特性，是第四代核反应堆系统中高温部件的主要候选材料。ASME规范第III卷第5册(简称ASME III-5)只提供了304不锈钢、316不锈钢、800H合金、2.25Cr-1Mo以及9Cr-1Mo-V五种材料在评价过程中所需要的数据，而ASME规范案例N-898 (简称N-898)补充给出了617合金的材料数据，并有望在后续会纳入到ASME规范中。N-898中还给出了一种弹性–理想塑性分析方法可以用于617合金的棘轮评价，该方法可以替代弹性分析方法和简化非弹性分析方法。本文依据N-898中提供的617合金蠕变本构模型，利用Fortran语言编写了Abaqus子程序，实现了基于非弹性分析方法的棘轮评价。通过算例，对弹性分析方法、简化非弹性分析方法、非弹性分析方法以及弹性–理想塑性分析方法进行了对比，讨论了不同评价方法之间的优缺点。
Alloy 617 is a high-temperature nickel-based material with excellent characteristics such as high temperature resistance and corrosion resistance. It is a primary candidate material for high-temperature components in the fourth-generation nuclear reactor systems. ASME III-5 only provides data for five materials—304 stainless steel, 316 stainless steel, alloy 800H, 2.25Cr-1Mo, and 9Cr-1Mo-V, required for evaluation processes. However, ASME Code Case N-898 supplements data for alloy 617 and is expected to be incorporated into ASME codes in subsequent revisions. N-898 also introduces an elastic-perfectly plastic analysis method for ratcheting evaluation of alloy 617, which can replace elastic analysis methods and simplify inelastic analysis methods. This paper, based on the creep constitutive model of alloy 617 provided in N-898, developed an Abaqus subroutine using Fortran language to implement ratcheting evaluation based on the inelastic analysis method. Through numerical examples, a comparison among elastic analysis method, simplified inelastic analysis method, inelastic analysis method and elastic-perfectly plastic analysis method was conducted, highlighting the advantages and disadvantages of different evaluation methods.
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