江冯
,
李萍
,
程从前
,
刘春慧
,
赵杰
材料工程
doi:10.11868/j.issn.1001-4381.2015.07.015
比较分析了复合模型法和θ投影法在描述P92钢蠕变行为时的差异.结果表明:两者在拟合P92钢蠕变-时间关系曲线上均有较高的精度,但在描述蠕变速率-时间曲线上,θ投影法呈现较大的误差而复合模型则有良好的关联结果.在外推蠕变速率时,θ投影法的外推结果发生较大偏折,而复合模型的预测结果更接近实际变化趋势.基于蠕变曲线外推持久寿命的结果表明:5％～50％范围内的断裂应变对寿命预测结果影响较小,两种模型预测的持久寿命值之间也相差不大.
关键词:
θ投影法
,
复合模型
,
蠕变速率
,
寿命预测
ZHU Shijie Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
China ZHAO Jie Fushun Institute of Petrochemistry
,
Fushun
,
China WANG Fugang Dalian University of Technology
,
Dalian
,
China Institute of Metal Research
,
Academia Sinica
,
Shenyang 110015
金属学报(英文版)
The influence of two different grain shapes and carbides in the HK40 alloy,the material for use of furnace tube,on the rate of creep crack growth has been investigated.The resistance to creep crack growth of the material with columnar grains is inferior than that with equiaxial grains when the load line is perpendicular to the columnar grain axis.The influence of secon- dary carbide on the rate of creep crack propagation depends upon the Brain shape.
关键词:
grain shape
,
null
,
null
