Types of Crack Origin of Three Point Bending Cleavage Fracture for 16MnR Steel
摘 要
通过扫描电子显微镜观察了不同温度(-30~-150 ℃)下粗晶粗碳化物组织16MnR钢的三点弯曲解理断口, 分析了解理断裂起裂源的类型。结果表明: 试验条件下起裂源的类型主要为晶界碳化物开裂、夹杂物开裂、较大的碳化物界面分离、球状碳化物与铁素体基体界面分离、晶粒边界开裂; 起裂源距塑性裂纹尖端的距离Xf对解理断裂起着决定性作用, 并随温度升高呈增大的趋势; 起裂源的类型对Xf值没有直接影响。
Abstract
Based on observation of scanning electron microscopy, three point bending cleavage fracture of 16MnR steel with coarse grain and coarse carbide was observed under different temperatures, and the style of crack origin of cleavage was analyzed. The results show that the types of crack origin were mainly carbide cracking on grain boundaries, inclusion cracking, interface separation of larger carbide, separation between spherical carbide and ferrite matrix and cracking of grain boundary in the experimental condition. The distance Xf between cleavage crack origin and plastic crack tip had a decisive effect on cleavage fracture and increased with temperature, and the Xf was not directly affected by the type of cleavage crack origin.
中图分类号 TG0346.1 TB115
所属栏目
基金项目 西安交通大学金属材料强度国家重点实验室开放研究项目(201011001); 国家自然科学基金资助项目(50905081, 50671047)
收稿日期 2010/10/4
修改稿日期 2011/5/27
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备注曹睿(1977-), 女, 甘肃临洮人, 副教授, 博士。
引用该论文: CAO Rui,LI Guang,ZHOU Zhen-zhen,FANG Xiu-yang,CHEN Jian-hong. Types of Crack Origin of Three Point Bending Cleavage Fracture for 16MnR Steel[J]. Materials for mechancial engineering, 2011, 35(10): 8~11
曹睿,李广,周珍珍,方修洋,陈剑虹. 16MnR钢三点弯曲解理断裂起裂源的类型[J]. 机械工程材料, 2011, 35(10): 8~11
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参考文献
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【2】CHEN J H. Physical models for cleavage fracture at various temperatures-bases for local approach to fracture of HSLA steel [J]. Mater Sci Eng A,2008,486:369-375.
【3】ZHANG X, KNOTT J. The statistical modeling of brittle fracture in homogeneous and heterogeneous steel microstrcture[J]. Act Mater,2000,48:2135-2146.
【4】ROSENFIELD A, SHETTY D, SKIDMORE A. Fractographic observations of cleavage initiation in the ductile-brittle transition region of a reactor-pressure-vessel steel[J]. Met Trans A,1983,14:1934-1937.
【5】ROSENFIELD A, SHETTY D. Cleavage fracture of steel in the upper ductile-brittle transition region[J]. Engineering Fracture Mechanics 1983,17(5):461-470.
【6】TANGUY B, BESSON J, PIQUES R, et al. Ductile to brittle transition of an A508 steel characterized by charpy impact test PartⅠ:experimental results[J]. Engineering Fracture Mechanics,2005,72:49-72.
【7】李广, 曹睿, 陈剑虹.韧脆转变低温区断裂韧度分析[J].机械强度,2010,32(3):442-445.
【8】CHEN J H, LI G, CAO R, et al. Micromechanism of cleavage fracture at the lower shelf transition temperatures of a C-Mn steel[J]. Materials Science and Engineering A,2010,527(18/19):5044-5054.
【9】SMITH E. The nucleation and growth of cleavage microcracks in mild steel[C]// Conference Physical Basis of Yield and Fracture. Oxford:Inst Phys Soc,1966.
【10】STROH A N. A theory of the fracture of metals[J]. Advanced Physics,1957,6:418-465.
【11】ZENER C. Fracture of metals[M]. Cleveland:ASM,1948.
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