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Data-based selection of creep constitutive models for high-Cr heat-resistant steel
Science and Technology of Advanced Materials ( IF 5.5 ) Pub Date : 2020-01-31 , DOI: 10.1080/14686996.2020.1738268
Hitoshi Izuno 1 , Masahiko Demura 1 , Masaaki Tabuchi 2 , Yoh-Ichi Mototake 3 , Masato Okada 1, 4
Affiliation  

ABSTRACT There are two types of creep constitutive equation, one with a steady-state term (steady-state type) and the other with no steady-state term (non-steady-state type). We applied the Bayesian inference framework in order to examine which type is supported by experimental creep curves for a Grade 91 (Gr.91) steel. The Bayesian free energy was significantly lower for the steady-state type under all the test conditions in the ranges of 50–90 MPa at 923 K, 90–160 MPa at 873 K and 170–240 MPa at 823 K, leading to the conclusion that the posterior probability was virtually 1.0. These findings mean that the experimental data supported the steady-state-type equation. The dependence of the evaluated steady-state creep rate on the applied stress indicates that there is a transition in the mechanism governing creep deformation around 120 MPa.

中文翻译:

基于数据的高铬耐热钢蠕变本构模型选择

摘要 蠕变本构方程有两种类型,一种有稳态项(稳态型),另一种没有稳态项(非稳态型)。我们应用贝叶斯推理框架来检查 91 级 (Gr.91) 钢的实验蠕变曲线支持哪种类型。在 923 K 时 50-90 MPa、873 K 时 90-160 MPa 和 823 K 时 170-240 MPa 的所有测试条件下,稳态类型的贝叶斯自由能显着降低,从而得出结论后验概率实际上是 1.0。这些发现意味着实验数据支持稳态型方程。评估的稳态蠕变速率对施加的应力的依赖性表明控制蠕变变形的机制在 120 MPa 左右发生了转变。
更新日期:2020-01-31
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