【作者】 杨振国； 李守新； 李永德； 柳洋波； 李广义； 惠卫军； 翁宇庆；

【Author】 Yang Zhenguo~1 Li Shouxin~1 Li Yongde~1 Liu Yangbo~1 Li Guangyi~1 Hui Weijun~2 Weng Yuqing~3 (1.Shenyang National Laboratory of Material Sciences,Chinese Academy of Sciences,Shenyang,110016:2.General Iron and Steel Research Institute,Beijing,100081;3.The Chinese Society for Metals,Beijing,100711)

【机构】 中国科学院金属研究所材料科学国家联合实验室； 北京钢铁研究总院； 中国金属学会；

【摘要】 本文从线弹性断裂力学角度出发,得出外加疲劳应力幅、钢中的夹杂物尺寸及氢含量是影响超高强度钢在超高周疲劳条件下疲劳寿命的决定性因素,进而推导出了疲劳寿命 N_f 与钢中非金属夹杂物尺寸 r₀及钢中氢浓度 C_H 的定量关系。对一种屈服强度约1750 MPa 的 JIS SCM435钢来说,当夹杂物尺寸减小为原来的约3/4时,同一外加应力幅下其疲劳寿命可提高为原来的10倍；当减小为原来的约0．6倍时,同一外加应力幅下其疲劳寿命可提高为原来的100倍。更多还原

【Abstract】 From the point of view of LEFM,this paper reveals that the applied stress amplitude,nonmetallic inclusion size r₀ and hydrogen concentration C_H in steel are the decisive factors in fatigue life Nf for super-high strength steel in very high cycle fatigue（VHCF）regime,in result their mathematical expression is obtained. According to this expression,for a JIS SCM435 steel with yield strength about 1750 MPa,if the inclusion size decreases to three-quarter time and 0.6 time greater than the original respectively,the fatigue life will reach up to about 10 and 100 times,respectively.更多还原