李劲
开展结构金属、工程结构、电子薄膜的腐蚀与扩散失效分析、快速评价、可靠性评估等工作。
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- 姓名:李劲
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学术头衔:
博士生导师
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学科领域:
材料科学基础学科
- 研究兴趣:开展结构金属、工程结构、电子薄膜的腐蚀与扩散失效分析、快速评价、可靠性评估等工作。
李劲,河北省青龙满族自治县人,1958年生。1982年毕业于清华大学工程物理系,1985 年在中国科学院金属研究所获得硕士学位, 1990年获法国巴黎南大学化学博士学位。
回国后在中国科学院金属腐蚀与防护研究所任助研(90)、副研(92)、研究员(94)、博导(96)。1并担任“耐蚀合金与环境敏感断裂”研究室主任和“金属腐蚀与防护”国家重点实验室常务副主任。1998年调入复旦大学材料科学系,现为物理电子学教研室教授,博士生导师。此外分别于1990和1996年在法国国家科研中心Bellevue材料物理实验室与巴黎南大学结构冶金实验室进行合作研究。
开展结构金属、工程结构、电子薄膜的腐蚀与扩散失效分析、快速评价、可靠性评估等工作。
近5年主要工作:(1)建立金相、电化学腐蚀、扩散与氧化、电学膜失效4个实验室。(2)基础研究:负责面上基金3项、上海市基础研究重点项目、973小课题、国际合作各1项。(3)应用基础研究:负责市科委专项4个、国家重点实验室课题1项。(4)重要企业课题:如宝钢课题2项、大亚湾核电站、岭澳核电站项目等,也服务民营企业。(5)国家大型工程专家组工作:如杭州湾跨海大桥、洋山深水港一期工程、东海大桥、舟山连岛大桥、杭州市政热力管网、苏州河水工钢结构等工程防腐方案的设计、审查与论证。
担任大亚湾核电站“腐蚀机理与防护技术”培训专家、宝钢技术专家及多种学会理事、杂志编委等学术兼职。获中国科学院青年科学家奖、全国优秀学术成果一等奖、部委科技进步奖等多项奖励。发表研究论文160余篇。多次国际、国内系列学术会议特邀报告。目前指导博士生、硕士生各5名。
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李劲, Wei Xuejun*, Li Jin and Ke Wei
,-0001,():
-1年11月30日
Single peak overload retardation of corrosion fatigue crack growth under constant AK control was studied for A537 steel in air and in a 3.5% NaC1 solution at the applied cathodic potential of -1400mV (SCE) and in free corrosion condition. The crack closure behaviour was examined by the speckle interferometry technique at different stages of fatigue crack propagation. Scanning electron microscopy was used to observe the morphologies of fracture surface. The experimental results showed that, in all conditions, overload retardation occurred and the retarded propagation distances of crack were longer than the plastic zone size caused by overload at the crack tip. In air or in 3.5% NaC1 at the cathodic potential, delayed retardation occurred after applying a peak overload, the crack growth consisted of three stages: crack extension due to overload; decelerating in crack growth; and resumption of crack growth rate. Immediate retardation occurred when specimens were tested in a 3.5% NaCl solution in free corrosion conditions. Crack extension due to overload was not observed. Under both cathodic polarization and free corrosion condition, the overload retardation phenomena were not as obvious as that in air. The retarded propagation distance and the retardation degree were both smaller than those in air. The mechanisms for overload retardation of corrosion fatigue crack growth under the control of hydrogen embrittlement and anodic dissolution were discussed on the basis of analyses of crack closure, residual compressive stress and crack tip blunting.
corrosion fatigue, crack propagation, overload, crack closure
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【期刊论文】INVESTIGATION OF INFLUENCE OF HYDROGEN ATTACK ON FATIGUE PROPERTIES OF PRESSURE VESSEL STEELS
李劲, J.L. Li, ), K.F. Want), J. Li), Z.M. Yao) and W. Ke)
,-0001,():
-1年11月30日
Influence of hydrogen attack on mechanical and fatigue properties of 1020, 15CrMo and 2.25Cr-lMo steels has been studied, which, were exposed to gaseous hydrogen at pressure of 18MPa and 300~480℃ for up to 480h. The results of fatigue test showed that hydrogen attack (HA) resulted in an obvious change in fatigue properties of 1020 and 15CrMo steels, however, 2.25Cr-1Mo steel showed a lower susceptibility to hydrogen attack due to the addition of Cr and Mo. Fatigue crack behaviour for 1020 steel is attributed to hydrogen attack damage and the crack closure induced by the rough cracking surface, which lead to a valley on △Kth~HA% plot. The change in the fatigue behaviour of 15CrMo steel is possibly caused by severe surface decarburization.
hydrogen attack,, pressure vessel steel,, threshold AK value,, crack closure
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【期刊论文】Slurry erosion resistance of fusion-bonded epoxy powder coating
李劲, Suzhen Luo a, ∗, Yugui Zheng a, Jin Li b, Wei Ke a
S. Luo et al./Wear 249(2001)733-738,-0001,():
-1年11月30日
Erosion resistance of fusion-bonded epoxy powder coating in emery sand slurry containing 1wt.% NaCl has been investigated by using modified rotating disk rig. The effects of emery sand content, flow velocity and diameter of emery particle on the erosion resistance of the coating have been studied through mass loss test and SEM observation. The results showed that the mass loss rate of the coating increased according to a power law with the flow velocity (V), emery particle content (C) and diameter of emery particle (D). The mass loss rate (E) of the coating could be described by an empirical equation, namely E ∝ V n1Cn-Dn3. The relative large values of n1 and n3 compared with n-indicated that the flow velocity and diameter of emery particle were the dominant factors. The critical flow velocity of the coating in slurry containing 10, 15, 20wt.% emery particle (112μm) was about 7, 6, 5.8m/s, respectively. Under the test conditions, the first critical diameter (FCD) and the second critical diameter (SCD) of emery particle were about 80 and 410μm, respectively. Within 80-410μm, the influence of mean diameter of emery particle on erosion was significant. Therefore, the coating is suitable for the relative mild conditions of liquid-particle two-phase flow such as low flow velocity and small particles.
Epoxy powder coating, Slurry erosion, Flow velocity, Sand particle content, Diameter of emery particle
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李劲, Suzhen Luo∗, Yugui Zheng, Jin Li, Wei Ke
S. Luo et al./Wear 254(2003)292-297,-0001,():
-1年11月30日
Fusion-bonded epoxy powder (FBEP) coatings are received wide applications in flow-handling components such as pipelines, slurry pumps. There exists a serious problem in above conditions due to slurry erosion. The purpose of this paper is to improve the erosion resistance of FBEP coatings by controlling curing process and composition of coatings. The slurry erosion behavior of FBEP coatings has been studied by using modified rotating disk rig. The surface morphologies were observed by using SEM. The cross-linked density and microstructure were analyzed by measuring curing degree, glass transition temperature (Tg) and water absorption. The results showed that the slurry erosion resistance increased with increasing curing degree. The coating cured at 160℃ for 60min, had more erosion resistance than the coating cured at 220℃ for 5min, although the curing degree of the former was same as that of the latter. The characteristics of fillers played an important role in the erosion behavior of FBEP coatings. The erosion resistance increased with the increasing of the fraction and size of fillers.
Epoxy powder coating, Slurry erosion, Curing degree, Water absorption, Glass transition temperature, Filler
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