摘要
将Super304H耐热钢分别在650~700℃进行高温时效,研究了该钢时效过程中显微组织结构和硬度的变化规律,并建立了硬度与Larson-Miller参数(P函数)之间的数学关系模型。结果表明:Super304H耐热钢的硬度随时效温度升高显著降低;温度恒定,随着时效时间的延长,其硬度先增加后降低,最后趋于稳定。基于相同P函数,采用线性拟合方法得到的高温时效Super304H耐热钢硬度与其P函数关系模型计算得到的硬度与试验实测硬度相吻合,该模型可用于服役态耐热钢管剩余服役寿命预测。
Artificial aging experiment of Super304 H heat resistant steel was carried out at temperature ranging from 650 ℃ to 700 ℃ to investigate the microstructure evolution and hardness change during aging.Moreover,the relationship between the hardness of the steel and the Larson-Miller parameter(Pfunction)was modeled mathematically.The results show that the hardness of Super304 Hsteel decreased dramatically with the increase of aging temperature.As the aging temperature was fixed,the hardness of Super304 Hsteel increased initially,and then decreased,but finally turned to be constant with the aging time prolonging.On condition of the same Pfunction,a mathematical relationship model between the hardness of Super304 Hsteel and the Pparameter was obtained via a linear fitting method.The calculated and tested hardness values were coincided with each other very well.Therefore,this mathematical model could be employed to predict the service life of Super304 H heat resistant steel tubes.
出处
《理化检验（物理分册）》
CAS
2014年第8期554-557,565,共5页
Physical Testing and Chemical Analysis(Part A:Physical Testing)
基金
安徽省电力科学研究院技术开发基金资助项目([2011]QTXM1336)
