Fatigue and creep-fatigue crack growth in alloy 709 at elevated temperatures

被引：8

作者：

Shaber, N. ^{[1
]}

Stephens, R. ^{[1
]}

Ramirez, J. ^{[1
]}

Potirniche, G. P. ^{[1
]}

Taylor, M. ^{[2
]}

Charit, I ^{[2
]}

Pugesek, H. ^{[1
]}

机构：

[1] Univ Idaho, Mech Engn Dept, 875 Perimeter Dr MS 0902, Moscow, ID 83844 USA

[2] Univ Idaho, Chem & Mat Engn Dept, Moscow, ID 83844 USA

来源：

MATERIALS AT HIGH TEMPERATURES | 2019年 / 36卷 / 06期

关键词：

Alloy; 709; creep fatigue; crack growth rate; finite element; NUMERICAL-SIMULATION; CLOSURE; BEHAVIOR; STEEL; DEFORMATION; EMPHASIS;

D O I：

10.1080/09603409.2019.1664079

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Fatigue crack growth (FCG) and creep-fatigue crack growth (CFCG) in austenitic stainless-steel Fe-25Ni-20Cr (Alloy 709) were measured experimentally and simulated using the finite element method. Temperature conditions investigated were 550 degrees C, 600 degrees C and 700 degrees C, with load hold times of 0 s, 60 s and 600 s. Fracture surface was investigated using scanning electron microscopy and optical imaging. Experiments indicated that crack growth exhibits minimal sensitivity to the various loading conditions evaluated. At 600 degrees C, crack growth rates were independent of hold time or loading frequency. At 700 degrees C, there was a small increase in crack growth rate as a function of hold time, with a 600s hold time causing a factor of 2 increase in crack growth rate over FCG. Finite element simulations were performed to compute plasticity-induced crack closure in the presence of creep deformations at the crack tip. The simulations produced FCG and CFCG rates similar to the experimental results.

引用

页码：562 / 574

页数：13

共 30 条

[11] The interactions between fatigue, creep and environmental damage in Ti 6246 and Udimet 720Li [J].