| CFB/M高强钢超高周疲劳断裂研究 | |
| 顾家琳 ; 崔文龙 ; 于洋 ; 白秉哲 ; 方鸿生 ; Gu Jialin ; Cui Wenlong ; Yu Yang ; Bai Bingzhe ; Fang Hongsheng | |
| 2010-07-15 ; 2010-07-15 | |
| 会议名称 | 2007中国钢铁年会论文集 ; Proceedings of CSM2007 Annual Meeting ; 2007中国钢铁年会 ; CSM2007 Annual Meeting ; 中国四川成都 ; CNKI ; 中国金属学会 |
| 关键词 | 无碳化物贝/马复相高强钢超高周疲劳 断裂 CFB/M duplex-phase high strength steel very high cycle fatigue fracture TG142.15 |
| 其他题名 | Study on the Very High Cycle Fatigue Fracture of CFB/M Duplex-phase High Strength Steel |
| 中文摘要 | 本文研究了无碳化物贝氏体/马氏体复相高强钢(CFB/M)的超高周疲劳行为。结果表明,CFB/M 复相高强钢并不存在传统的疲劳极限,10~7周次以后依然会在传统疲劳极限的载荷条件下发生疲劳破坏。在10~6～10~7周次范围。起裂位置由表面起裂转为内部起裂,且在内部大多为非夹杂起裂。试样内部聚集的微孔洞、成分偏析处、三叉晶界等强度薄弱区可能导致疲劳裂纹的萌生。内部起裂试样的断口表面存在明显的鱼眼和光学暗区形貌特征。鱼眼和光学暗区处的门槛值△K_(fish-eye)和△K_(ODA)的数值分别为一个常数,其大小和外加载荷水平,疲劳寿命及起裂点深度基本无关。因此,可以把它们看作是材料本身所固有的性质。高洁净度对提高超高周疲劳件能有利,改善材料的均匀性还有可能进一步提高其超高周疲劳性能。; The very high cycle fatigue behaviors of a new Mn-Si-Cr bainite/martensite duplex-phase high strength steels (CFB/M)were studied in this paper.The results show that there is no conventional fatigue limit,and in 10~6～10~7 cycles origin sites shift from surface to interior.The origin sites of the specimens in interior initial cracking are in the micro-holes, segregation area of the element,triangle grain boundary and so on,in which the strength of the material is weak.Obvious fish-eye and ODA(optical dark area)marks are found on the fracture surface of interior initiation specimens.By calculating the values of ΔK at the edge Of ODA and fish-eye,it is found that the values of ΔK_(fish-eye)and ΔK_(ODA)tend to be constant respectively,independent of the stress amplitude,fatigue life and the distance of the initiation site to the edge of specimen, which may show the intrinsical property of the material.The improvement of the uniformity of the steel could enhance the very high cycle fatigue property. |
| 会议录出版者 | 冶金工业出版社 |
| 语种 | 中文 ; 中文 |
| 内容类型 | 会议论文 |
| 源URL | [http://hdl.handle.net/123456789/66476]  |
| 专题 | 清华大学 |
| 推荐引用方式 GB/T 7714 | 顾家琳,崔文龙,于洋,等. CFB/M高强钢超高周疲劳断裂研究[C]. 见:2007中国钢铁年会论文集, Proceedings of CSM2007 Annual Meeting, 2007中国钢铁年会, CSM2007 Annual Meeting, 中国四川成都, CNKI, 中国金属学会. |
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