高氮奥氏体钢的冲击断口形貌研究  

Research on impact fracture morphology of high nitrogen austenitic steel

作　　者：彭梦都 时捷[1] 崔冰[2] 孙挺[1] 李晓源[1] 王毛球[1] PENG Meng-du;SHI Jie;CUI Bing;SUN Ting;LI Xiao-yuan;WANG Mao-qiu(Institute for Special Steels, Central Iron and Steel Research Institute, Beijing 100081, China;School of Materials Science and Engineering, Anhui University of Technology, Maanshan 243000, China)

机构地区：[1]钢铁研究总院特殊钢研究所,北京100081 [2]安徽工业大学材料科学与工程学院,安徽马鞍山243000

出　　处：《塑性工程学报》2018年第2期240-245,共6页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(51301042)

摘　　要：通过采用金相及扫描电子显微镜对高氮奥氏体Fe-20Mn-19Cr-O．5C-0．6N钢不同冲击温度下的断口形貌进行观察，并结合冲击韧性研究了材料在不同温度下的冲击断口形貌变化规律。研究结果表明：在20--50℃冲击时，断面纤维率超过88％，断口放射区形貌由全韧窝态转变为以粗大撕裂棱和二次解理组成的准解理混合断裂形貌，断口纤维区和剪切唇均由韧窝组成。在-60～-196℃冲击时，冲击断面纤维率逐步降至0％，断口放射区形貌以细小撕裂棱和一次解理为主的混合断裂形貌，随着冲击温度的降低，断口纤维区和剪切唇由拉长韧窝为主转变为以等轴细小且平坦韧窝为主的形貌。The impact fracture morphologies under different temperatures of Fe-20Mn-19Cr-O. 5 C-O. 6N steel were observed by using opti- cal microscopy and scanning electron microscope. And the evolution of impact fracture morphology under different temperatures was inves- tigated combined with impact toughness. The results show that in the impact temperature range from 20 to - 50 ℃, the radical zone mor- phology transits from fully dimple state to quasi cleavage mixed fracture morphology consisted of coarse tearing ridge and secondary cleav- age, the fibrous region and shear lip of fracture surface consists of dimples. Furthermore, the fiber ratio of fracture surface exceeds 88%. For the impact temperature range from - 60 to - 196 ℃ , the fiber ratio of fracture surface gradually decreases to approximate 0% , and the radical zone morphology mainly consists of fine tearing ridge and cleavage, and the morphology of fibrous region and shear lip transits from stretched dimples to equiaxed, fine and fiat dimples.

关 键 词：Fe-20Mn-19Cr-0.5C-0.6N钢 宏观断口 纤维区 放射区 剪切唇 

分 类 号：TG142.11[一般工业技术—材料科学与工程]