压力容器2018，Vol.35Issue(5)：1-6,12,7.DOI:10.3969/j.issn.1001-4837.2018.05.001
缺口和环境对Custom450钢高周疲劳强度的影响
Effects of Notch and Environment on High Cycle Fatigue Strength of Custom450 Steel
摘要
Abstract
Axial push-pull fatigue tests using both smooth and notched specimens of Custom450 were car-ried out under the environment of room temperature air and low-oxygen steam.The effects of environment and notch on fatigue strength,crack initiation mechanism and notch sensitivity were analyzed;and the the-oretical calculation model of fatigue notch factor Kfwas discussed.The results show that both the notch and low-oxygen steam environment can reduce fatigue strength of the specimens significantly,though the notch with higher stress concentration ( Kt＝2.53) has greater effect;the degradation effect of environ-ment on fatigue strength is mainly exhibited as crack initiation from specimen surface,but slightly decrea-ses with the increase of the cycles due to crack initiation within the specimen.At the same time,the inter-action of environment and notch leads to higher Kfvalue than stress concentration factor,Kt,showing that Kfis influenced by the environment relatively greatly,and non-conservative results will be obtained using the existing empirical formulas.关键词
蒸汽环境/缺口/高周疲劳/疲劳强度/疲劳缺口系数/应力集中系数Key words
steam environment/notch/high cycle fatigue/fatigue strength/fatigue notch factor/stress con-centration factor分类
机械制造引用本文复制引用
金龙,朱明亮,轩福贞..缺口和环境对Custom450钢高周疲劳强度的影响[J].压力容器,2018,35(5):1-6,12,7.基金项目
国家自然科学基金项目(51575182) （51575182）
