LCF behavior and life prediction method of a single crystal nickel-based superalloy at high temperature  

作　　者：Zhihua ZHANG Huichen YU Chengli DONG 

机构地区：[1]Beijing Key Laboratory of Aeronautical Materials Testing andEvaluation, Science and Technology on Advanced High TemperatureStructural Materials Laboratory, Beijing Institute of AeronauticalMaterials, Beijing 100095, China

出　　处：《Frontiers of Mechanical Engineering》2015年第4期418-423,共6页机械工程前沿（英文版）

基　　金：The financial support for this work from the National Natural Science Foundation of China （Grant No. 51341001） is appreciated.

摘　　要：Low cycle fatigue tests were conducted on the single crystal nickel-based superalloy, DD6, with different crystallographic orientations （i.e., [001], [011], and [111]） and strain dwell types （i.e, tensile, compressive, and balanced types） at a certain high temperature. Given the material anisotropy and mean stress, both orientation factor and stress range were introduced to the Smith, Watson, and Topper （SWT） stress model to predict the fatigue life. Experimental results indicated that the fatigue properties of DD6 depend on both crystallographic orientation and loading types. The fatigue life of the tensile, compressive, and balanced strain dwell tests are shorter than those of continuous cycling tests without strain dwell because of the important creep effect. The predicted results of the proposed modified SWT stress method agree well with the experimental data.Low cycle fatigue tests were conducted on the single crystal nickel-based superalloy, DD6, with different crystallographic orientations （i.e., [001], [011], and [111]） and strain dwell types （i.e, tensile, compressive, and balanced types） at a certain high temperature. Given the material anisotropy and mean stress, both orientation factor and stress range were introduced to the Smith, Watson, and Topper （SWT） stress model to predict the fatigue life. Experimental results indicated that the fatigue properties of DD6 depend on both crystallographic orientation and loading types. The fatigue life of the tensile, compressive, and balanced strain dwell tests are shorter than those of continuous cycling tests without strain dwell because of the important creep effect. The predicted results of the proposed modified SWT stress method agree well with the experimental data.

关 键 词：single crystal superalloy low cycle fatigue（LCF） crystallographic orientation strain dwell lifeprediction 

分 类 号：U469.11[机械工程—车辆工程] X53[交通运输工程—载运工具运用工程]