A non-isothermal creep fracture prediction method of DS superalloy considering microstructural damage

被引：3

作者：

Gu, Shuning ^{[1
]}

Gao, Hangshan ^{[1
]}

Wang, Jundong ^{[1
]}

Zhang, Chengjiang ^{[2
]}

Wen, Zhixun ^{[1
]}

Xing, Ai ^{[3
]}

Yue, Zhufeng ^{[1
]}

机构：

[1] Northwestern Polytech Univ, Sch Mech Civil Engn & Architecture, Xian 710072, Peoples R China

[2] Shanghai Univ, Sch Mat Sci & Engn, State Key Lab Adv Special Steels, Shanghai 200444, Peoples R China

[3] AECC Hunan Aviat Powerplant Res Inst, Zhuzhou 412300, Hunan, Peoples R China

来源：

ENGINEERING FRACTURE MECHANICS | 2023年 / 287卷

基金：

中国国家自然科学基金;

关键词：

Variable amplitude loading; Initial flaw size; Fatigue crack growth; Plastic zone size; SINGLE-CRYSTAL SUPERALLOY; NICKEL-BASE SUPERALLOY; HIGH-TEMPERATURE CREEP; LOW-STRESS CREEP; VISCOPLASTIC CONSTITUTIVE MODEL; TURBINE-BLADES; BEHAVIOR; DEFORMATION; MECHANISM; PHASE;

D O I：

10.1016/j.engfracmech.2023.109350

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

Nonisothermal service conditions are one of the main abnormal failure modes of aero-engines. The creep tests of a Ni-based directionally solidified superalloy under nonisothermal creep conditions (T-over= 980( ?)C, 1000 C-? and 1020( ?)C) and constant load (s = 227 MPa) were analyzed by SEM. According to the creep tests, we calculate the key creep parameters. By studying tests interrupted at different stages of creep, the microstructure evolution law is obtained. Based on the above research, an improved constitutive model is proposed. The creep behavior under different T-over is simulated and calculated. The simulation results are in good agreement with the experi-mental results.

引用

页数：15

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