输油管道用316L和2205不锈钢低温蠕变模型的选择与验证

摘要

分别进行了80℃下316L不锈钢和20℃下2205不锈钢的蠕变试验,对试验数据拟合后分别得到了两种不锈钢的蠕变幂模型和对数模型,并推导得到了应力松驰模型;利用蠕变和应力松驰模型分别模拟了两种不锈钢的拉伸蠕变曲线和应力松驰曲线,并与试验曲线进行了对比分析.结果表明:两种模型都能很好地描述316L和2205不锈钢的低温蠕变行为,但幂模型在蠕变和松弛模拟中都表现得更好.%The creep tests of 316L stainless steel at 80 ℃ and of 2205 stainless steel at 20 ℃ were conducted respectively.The power-law creep model and logarithmic creep model of the two stainless steels were obtained after the tested data fitting and the stress relaxation models were deduced.The tensile creep curves and stress relaxation curves of the two stainless steels were simulated by the creep and stress relaxation models respectively.The simulated results were compared and analysed with the experimental curves.The results show that both models can describe the low temperature creep behaviour of the 316L and 2205 stainless steels well.The power-law model performed better in creep fitting and relaxation simulation.