Prediction of low-cycle crack initiation life of powder superalloy FGH96 with inclusions based on damage mechanics  

基于损伤力学的含夹杂粉末高温合金FGH96低周裂纹萌生寿命预测

作　　者：Yuan-ming XU Shu-ming ZHANG Tian-peng HE Xin-ling LIU Xia-yuan CHANG 徐元铭;张书明;贺天鹏;刘新灵;常夏源(北京航空航天大学航空科学与工程学院,北京100191;中国航发北京航空材料研究所,北京100095)

机构地区：[1]School of Aeronautic Science and Engineering,Beihang University,Beijing 100191,China [2]AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China

出　　处：《Transactions of Nonferrous Metals Society of China》2022年第3期895-907,共13页中国有色金属学报（英文版）

基　　金：sponsored by AECC Beijing Institute of Aeronautical Materials;funded by National High-tech R&D Program of China (863 Program) (No. 2015AA034401)。

摘　　要：The effects of inclusions in powder superalloy FGH96 on low-cycle fatigue life were studied, and a low-cycle crack initiation life prediction model based on the theory of damage mechanics was proposed. The damage characterization parameter was proposed after the construction of damage evolution equations. Fatigue tests of the powder superalloy specimens with and without inclusion were conducted at 530 and 600 ℃, and the model verification was carried out for specimens with elliptical, semi-elliptical, polygon and strip-shaped surface/subsurface inclusion. The stress analysis was performed by finite element simulation and the predicted life was calculated. The results showed a satisfying agreement between predicted and experimental life.研究FGH96粉末高温合金中夹杂物对低周疲劳寿命的影响,提出基于损伤力学理论的低周裂纹萌生寿命预测模型,在建立损伤演化方程后提出损伤表征参数。对含夹杂物和不含夹杂物的粉末高温合金试样在530℃和600℃下进行疲劳试验,并对具有椭圆形、半椭圆形、多边形和条形表面/亚表面夹杂物的试样进行模型验证,然后通过有限元模拟进行应力分析,并计算预测寿命。结果表明,预测寿命和实验寿命之间具有令人满意的一致性。

关 键 词：powder superalloy FGH96 low-cycle fatigue INCLUSION crack initiation life prediction damage mechanics 

分 类 号：TG132.3[一般工业技术—材料科学与工程]