Evaluation of the crystallographic fatigue crack growth rate in a single-crystal nickel-base superalloy

被引：11

作者：

Busse, C. ^{[1
]}

Palmert, F. ^{[2
]}

Sjodin, B. ^{[3
]}

Almroth, P. ^{[3
]}

Gustafsson, D. ^{[3
]}

Simonsson, K. ^{[1
]}

Leidermark, D. ^{[1
]}

机构：

[1] Linkoping Univ, Div Solid Mech, SE-58183 Linkoping, Sweden

[2] Linkoping Univ, Div Engn Mat, SE-58183 Linkoping, Sweden

[3] Siemens Ind Turbomachinery AB, SE-61283 Finspang, Sweden

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2019年 / 127卷

关键词：

Single-crystal nickel-base superalloys; Finite element analysis; Fracture mechanics; Stress intensity factor; Crystallographic cracking; Fatigue crack growth rate; STRESS INTENSITY FACTORS; RESOLVED SHEAR-STRESS; BEHAVIOR; PROPAGATION;

D O I：

10.1016/j.ijfatigue.2019.05.023

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Cracks in single-crystal nickel-base superalloys have been observed to switch cracking mode from Mode I to crystallographic cracking. The crack propagation rate is usually higher on the crystallographic planes compared to Mode I, which is important to account for in crack growth life predictions. In this paper, a method to evaluate the crystallographic fatigue crack growth rate, based on a previously developed crystallographic crack driving force parameter, is presented. The crystallographic crack growth rate was determined by evaluating heat tints on the fracture surfaces of the test specimens from the experiments. Complicated crack geometries including multiple crystallographic crack fronts were modelled in a three dimensional finite element context, The data points of the crystallographic fatigue crack growth rate collapse on a narrow scatter band for the crystallographic cracks indicating a correlation with the previously developed crystallographic crack driving force.

引用

页码：259 / 267

页数：9

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