CLAM钢的高温蠕变行为

Creep behavior of CLAM steel at high temperature

为了保证CLAM钢在服役条件下的安全性,避免蠕变对设备造成破坏,对CLAM钢的蠕变行为进行了研究。首先,在高温持久蠕变试验机上对CLAM钢进行蠕变试验,绘制了蠕变曲线并讨论了CLAM钢在试验条件下的蠕变变形机制,结果表明,CLAM钢具有很强的温度敏感性,第二相粒子强化机制为主要蠕变机制;其次,采用双对数等温线外推法和Larson-Miller参数法对CLAM钢的蠕变寿命进行了预测,确定了两种蠕变寿命预测模型;最后,比较了两种蠕变寿命预测模型的精度,结果显示,Larson-Miller参数法的外推精度更高,更能反映实际情况。

In order to protect the security of CLAM steel under service condition and avoid the damage of theequipmentfrom creep,the creep behavior of CLAM steel was studied. First of all,the creep test of CLAM steel was conducted usinghigh temperature lasting creep testing machine,the creep curve was drawn and the creep deformation properties of CLAM steel under test conditions were discussed.The result showed that CLAM steel was highly sensitive to temperature,and the strengthening mechanism of the second phase particles was main creepmechanism. Secondly,the creep life of CLAM steel was predicted using double logarithmic isothermal extrapolation method and Larson-Miller parametric method,and two kinds of creep life prediction models were confirmed. Atlast,the resultsfromthe two models were compared,and result showed the extrapolation accuracy of Larson-Miller parametric method was higher,matchingwith the actual situation much closer.