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研究了轧制态、正火态X70管线钢和AISI304不锈钢的室温蠕变行为,发现在数种应力水平下此2种钢主要呈现为速率递减的对数蠕变特征.室温蠕变和拉伸实验的关系表明,室温蠕变实验中的加载过程与拉伸实验相同,且室温蠕变开始时的应变速率与加载过程结束时的相等.在此基础上,结合室温蠕变本构方程和描述拉伸实验中应力应变关系的Ramberg-Osgood公式,提出了基于外加应力估算结构钢室温蠕变的方法.该方法得到的X70管线钢和AISI304不锈钢室温蠕变量的估算结果与实验值符合得较好,误差均在2倍因子之内.
The creep behavior at room temperature of rolled and normalized X70 pipeline steel and AISI 304 stainless steel was studied and found that the two types of steel presented logarithmic creep characteristics of decreasing rate at several stress levels.The creep and tensile at room temperature The experimental results show that the loading process in room temperature creep test is the same as the tensile test, and the strain rate at the beginning of creep at room temperature is equal to that at the end of the loading process.On the basis of this, combined with the creep constitutive equation at room temperature and the description Tensile Radenberg stress-strain relationship Ramberg-Osgood formula, proposed based on external stress analysis of structural steel creep at room temperature method obtained X70 pipeline steel and AISI304 stainless steel at room temperature creep amount of the estimated results in line with the experimental value Well, the error is within 2 times the factor.