高氮奥氏体不锈钢室温疲劳断口分析  

Analysis on fatigue fracture of high nitrogen austenitic stainless steel at room temperature

作　　者：刘瑜[1] 戴起勋[1] 陈康敏[1] 袁志钟[1] 韩剑[1] 高佩[1] 吉晓霞[1] 

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013

出　　处：《金属热处理》2009年第4期56-59,共4页Heat Treatment of Metals

基　　金：教育部博士点基金项目(20050299008)

摘　　要：研究了新型高氮奥氏体不锈钢(24Mn18Cr3Ni0.62N)在室温条件下的拉-拉疲劳行为,并对疲劳断口形貌进行观察分析。结果表明,疲劳曲线(S-N曲线)呈阶梯状下降趋势,平缓区对应载荷应力约为410MPa为条件疲劳强度;疲劳断口特征明显,可清晰观察到疲劳条带、解理台阶、沿晶裂纹、瓦纳线以及二次裂纹。Tensile-tensile fatigue behaviours of a new type of high nitrogen austenitic stainless steel 24Mn18Cr3Ni0.62N at room temperature were studied.The fatigue fracture morphology of the samples was observed.The results show that the fatigue curves（S-N curve） display the stepladder-like downward trend.The load stress in the flat slope area is around 410 MPa,which is the conditional fatigue strength;the fatigue fracture shows clear striations,cleavage steps,intergranular cracks,wallner lines and the secondary cracks.

关 键 词：高氮奥氏体不锈钢 疲劳试验 疲劳曲线 断口形貌 

分 类 号：TG142.71[一般工业技术—材料科学与工程]