一种新型980 MPa高强钢的低温四点弯曲断裂行为
Four-Point Bending Fracture Behaviors at Low Temperatures of A New 980 MPa High Strength Steel
摘 要
在不同试验温度(-196~200 ℃)下对一种新型980 MPa高强钢进行了带缺口试样的四点弯曲试验, 并用扫描电镜对其断口进行了观察,研究了该钢的断裂行为。结果表明:随着试验温度升高, 该钢的韧性逐步提高; 在-100 ℃及以上温度时, 该钢的断裂形态为韧性断裂, 韧性较好; 在-100 ℃以下, 逐渐由韧性向脆性断裂过渡, 在-196 ℃时, 为脆性准解理断裂。
断裂机理
四点弯曲
980 MPa high strength steel
fracture mechanism
four-point bending
Abstract
Four-point bending tests for the sample with notch at different temperatures (-196-200 ℃) were performed on a new 980 MPa high strength steel. The fracture surface was observed by scanning electron microscopy. The fracture behaviors of the high strength steel were investigated. The results show that with increasing the test temperature, the toughness of the steel gradually increased. It was ductile fracture at -100 ℃ or above, and the toughness was good. The fracture feature transformed from ductile fracture to brittle fracture at below -100 ℃. It was brittle quasi-cleavage fracture at -196 ℃.
中图分类号 TG301
所属栏目
基金项目 国家自然科学基金资助项目(50905081,50671047); 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)
收稿日期 2010/2/4
修改稿日期 2010/12/10
网络出版日期
作者单位点击查看
备注曹睿(1977-),女,甘肃临兆人,副教授, 博士。
引用该论文: CAO Rui,YAN Ying-jie,LI Guang,DU Wan-sheng,PENG Yun,TIAN Zhi-ling,CHEN Jian-hong. Four-Point Bending Fracture Behaviors at Low Temperatures of A New 980 MPa High Strength Steel[J]. Materials for mechancial engineering, 2011, 35(4): 72～75
曹睿,闫英杰,李广,杜挽生,彭云,田志凌,陈剑虹. 一种新型980 MPa高强钢的低温四点弯曲断裂行为[J]. 机械工程材料, 2011, 35(4): 72～75
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参考文献
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【3】TANGUY B, BESSON J, PIQUES R,et al. Ductile to brittle transition of an A508 steel characterized by Charpy impact test: Part II: modeling of the Charpy transition curve[J].Engineering Fracture Mechanics,2005,72(3):49-72.
【4】BHADESHIA H K D, EDMONDS D V. Bainite in silicon steels: new composition-property approach, part 1[J].Met Sci,1983,17:411-419.
【5】BHADESHIA H K D, EDMONDS D V. Bainite in silicon steels: new composition-property approach, part 2[J].Met Sci,1983,17:420-428.
【6】MIIHKINEN V T T, EDMONDS D V. Tensile deformation of two experimental high-strength bainitic low-alloy steels containing silicon[J].Material Science and Technology,1987,3:432-440.
【7】MIIHKINEN V T T, EDMONDS D V. Fracture toughness of two experimental high-strength bainitic low-alloy steels con-taining silicon[J].Material Science and Technology,1987,3:441-449.
【8】闫英杰, 曹睿, 杜挽生, 等.一种新型980 MPa高强钢在不同温度下的拉伸断裂试验[J].材料科学与工程学报, 2009, 27(2): 246-249.
【9】曹睿, 闫英杰, 杜挽生, 等.一种新型980 MPa高强钢的弯曲断裂机理[J].材料科学与工程学报, 2009, 27(5): 696-700.
【10】王国珍.低合金钢细观解理断裂应力σf及断裂模型的研究[D].兰州:甘肃工业大学, 2002.
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