Creep characterization of a Ni-based Hastelloy-X alloy by using theta projection method

摘要：

The O projection method was applied to characterize the creep behavior of the Hastelloy-X alloy at 950℃. Four O parameters were established by a nonlinear least square fitting (NLSF) to the creep curves. In the NLSF of the full creep curves, the O1 and O2 parameters were not defined with a large error, but the O3 and O4 parameters were defined well without an error. An optimum cutoff strain range for defining the four O parameters was found to be a 3％ strain. Four O parameters revealed a good linearity as a function of stress. The predicted minimum creep rate showed a good agreement with the experimental data. At 950℃ of the Hastelloy-X alloy, the creep curves, the creep rate, and the time to reach a limiting strain were estimated with a wide range of stresses.

关键词： Hastelloy-X alloy heta (O) projection method Nonlinear least square fitting Creep rate

作者: Woo-Gon Kim Song-Nan Yin Yong-Wan Kim Jong-Hwa Chang

作者单位: korea Alomic Energy Research Institute.150 Deokjin-dong Yuseong-gu.Daejeon 305-353.Republic of Korea

会议类型: 国际会议

会议名称: The Eighth International Conference on Fundamentals of Fracture(ICFF VIII)(第八届断裂基础国际会议)

会议地点: 香港·广州

会议语种:英文

页码: 4985-4995

在线出版日期: 2008-01-03（万方平台首次上网日期，不代表论文的发表时间）