4.5Ni钢表面裂纹的低周疲劳扩展行为研究  

Propagation Behavior of Low-cycle Fatigue Surface Crack in 4.5Ni Steel

作　　者：胡素坤[1] 李春 林常海 王任甫[1] 孙民[1] 

机构地区：[1]洛阳船舶材料研究所

出　　处：《材料开发与应用》1997年第4期2-5,12,共5页Development and Application of Materials

摘　　要：采用悬臂弯曲加载方式，以总应变范围作为受检和控制参数，分析了高强度４．５Ｎｉ钢表面裂纹的低周疲劳扩展行为，给出了裂纹扩展速率ｄ（２ａ）／ｄＮ与总应变范围ΔεＴ的关系式及关系曲线。同时对弯曲加载条件下低周疲劳损伤断口微观形貌进行了观察分析。指出４．５Ｎｉ钢的低周疲劳裂纹扩展方式主要是穿晶，疲劳辉纹为晶体学延性辉纹，疲劳裂纹扩展属于塑性钝化模型机制。The propagation behavior of low-cycle fatigue surface cracks in 4.5Ni steel was analysed with cantilever-bending loading and total strain range as an examined and controlled parameter. The relationship between crack growth rate d(2 a )/d N and total strain range Δε T was given. The examination of microscopic appearance of low cycle fatigue fracture was conducted. The results show that for the low-cycle fatigue cracking propagation of 4.5Ni steel a transcrystalline mode is predominant with a crystallogic ductile fatigue striation and the fatigue crack propagation is of plastic passivation model mechanism.

关 键 词：结构钢 表面裂纹 低周疲劳 潜艇 裂纹扩展 

分 类 号：U674.760.4[交通运输工程—船舶及航道工程] TG142.41[交通运输工程—船舶与海洋工程]