高温下DP980钢蠕变损伤研究

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Research on Creep Damage ofDP98O Steel at High Temperature

DONG Yexiang SHENG Dongfa （School of Civil Engineering，Southwest Forestry University，Kunming 65O224， China）

Abstract： [Purpose] To study the creep behavior of DP98O steel at high temperature，providing a basis for the safety evaluation and life prediction of DP98O steel components under high-temperature conditions.[Methods] High-temperature creep tests were conducted under conditions of 823 K and 923 K， and the Sinh damage model and the Norton coupled damage creep model were fited.[Results] The analysis of the material's creep damage behavior and life prediction accuracy shows that the Sinh damage model can fuly describe the evolution of the damage variable from Oto 1.[Conclusions] The creep life prediction error is smaller than that of the Norton coupled damage creep model，making it more suitable for creep damage analysis of DP98O steel.

Keywords： high-temperature creep; Sinh damage model; Norton coupled damage creep model; life prediction

0 引言

在如今工程领域，越来越多的结构在高温环境下服役，如发动机部件、高温反应设备及高温管道等。（剩余5603字）