A comparative study of constitutive equations for the creep deformation of HP40Nb micro-alloyed steel

Amitava Ghatak; P.S. Robi

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A comparative study of constitutive equations for the creep deformation of HP40Nb micro-alloyed steel

机译：HP40Nb微合金钢蠕变变形本构方程的比较研究

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Creep behavior of HP40Nb micro-alloyed steel was examined at temperatures ranging from 923 K to 1323 K and stress levels in the range 47 MPa to 120 MPa. The effect of higher stress or temperature reduced primary and secondary creep region. The paper compared two different forms of constitutive models: power law approach and Dorn approach to predict the creep behavior of the investigated steel. Experimental data was used to determine constitutive parameters. The results revealed that minimum creep rate depends on applied stress and test temperature. Stress exponent and activation energy for creep of power law expression decreased non-linearly with the increase in temperature and stress, respectively. The minimum creep rate data calculated using Dorn approach shows good agreement with the experimental data.

机译：在923 K至1323 K的温度和47 MPa至120 MPa的应力水平下检查了HP40Nb微合金钢的蠕变行为。较高的应力或温度的影响会减小初级和次级蠕变区域。本文比较了两种不同形式的本构模型：幂律方法和Dorn方法，以预测所研究钢材的蠕变行为。实验数据用于确定本构参数。结果表明，最小蠕变速率取决于所施加的应力和测试温度。幂律表达式蠕变的应力指数和活化能分别随温度和应力的增加而非线性降低。使用Dorn方法计算的最小蠕变速率数据与实验数据显示出良好的一致性。

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《Materials Science and Engineering》 |2015年第11期|418-427|共10页
作者
Amitava Ghatak; P.S. Robi;
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作者单位

Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati-781039, India;

Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati-781039, India;

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正文语种 eng
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Ferrous alloy; Mechanical characterization; Creep; Failure; Electron microscopy;

机译：黑色合金;机械特性蠕变;失败;电子显微镜;

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3. Creep deformation characteristics of microalloyed HP40Nb steel at 950 degrees C [J] . Van Hung Dao, Song Jung Soo, Kim Joo Yong, Journal of Mechanical Science and Technology . 2019,第10期

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A comparative study of constitutive equations for the creep deformation of HP40Nb micro-alloyed steel

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