柳百成
长期从事铸铁结晶凝固过程和石墨形态控制的基础研究,及提高铸铁性能和开发新型铸铁的应用研究。近年来,致力于精确铸造技术的基础与应用研究及先进制造技术研究。
个性化签名
- 姓名:柳百成
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学术头衔:
博士生导师, “973”、“863”首席科学家,
- 职称:-
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学科领域:
机械制造自动化
- 研究兴趣:长期从事铸铁结晶凝固过程和石墨形态控制的基础研究,及提高铸铁性能和开发新型铸铁的应用研究。近年来,致力于精确铸造技术的基础与应用研究及先进制造技术研究。
1955年清华大学机械工程系毕业, 获优秀毕业生金质奖章。1978年至1981年以访问学者身份在美国威斯康星大学及麻省理工学院从事科学研究2年。1999年当选为中国工程院院士,2002年获光华工程科技奖。 在国内较早提出用电子计算机技术改造传统铸造行业,主持多项国家973计划、国家自然科学重大基金及重点基金等项目,在开拓多学科宏观及微观铸造过程模拟仿真研究新领域作出贡献。研究开发的铸造过程模拟软件“铸造之星”已在许多工厂及院所应用,取得了显著的经济及社会效益。长期从事铸铁结晶凝固过程和石墨形态控制的基础研究,及提高铸铁性能和开发新型铸铁的应用研究。近年来,致力于精确铸造技术的基础与应用研究及先进制造技术研究。成果在重型机械行业及汽车工业中推广应用。先后获国家教育部科技进步(基础类)一等奖2项,省部级科技进步二等奖5项,科技进步三等奖4项及国家发明专利2项。获1981年美国铸造学会杰出论文及1993年美国密歇根州特殊表彰奖状。 从事铸造及材料加工工程学科高等教育事业近50年,培养了一大批高级工程科技人才,1993年获北京市高等学校优秀教学成果一等奖。应邀先后赴美国麻省理工学院等30余所大学讲学, 在国际学术会议作邀请报告及宣读论文20余篇。发表论文300余篇,被SCI、EI及ISTP收录120余篇。 兼任中国机械工程学会理事、中国机械工程学会铸造分会名誉理事、中国铸造协会顾问、北京市机械工程学会常务理事、北京市铸造学会副理事长等职,兼任国际学术刊物“International Journal of Cast Metals Research” 中国编委,及金属学报、钢铁学报及Journal of Materials Science and Technology等学术刊物编委。
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408
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成果数
10
【期刊论文】MODELING OF MICROPOROSITY EVOLUTION AND FATIGUE LIFE OF ALUMINUM ALLOY CASTINGS
柳百成, Shuyong DONG, Zhuo ZHUANG, Shoumei XIONG, Baicheng LIU
,-0001,():
-1年11月30日
A mathematical model to calculate the formation and growth of microporosity of aluminum alloys was developed by coupling with a probabilistic microstructure evolution model. The model incorporated various solidification phenomena such as grain structure evolution, solidification shrinkage, interdendritic fluid flow and formation and growth of pores during solidification processes. For microstructure evolution, the nucleation and growth of grains were modeled with a stochastic method that utilizes the results from a macro scale heat transfer model to determine the transition rules of grain evolution. Experiments were made to validate the proposed models. In fatigue life prediction, aluminum alloy castings with microporosity were treated as a kind of porous materials. Based the results of casting process simulation and stress-strain analysis, the fatigue life prediction of a sample casting with microporositis was presented.
Numerical simulation,, Microporosity prediction,, Fatigue life,, Aluminum alloy castings
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柳百成, SUN Libin, XU Qingyan, LIU Baicheng
,-0001,():
-1年11月30日
To study the as-cast microstructure of ZG0Cr13Ni4Mo stainless steel that has been applied to turbine blade for the Three Gorges Project of Yangzi River, the physical and mathematical models of phase transformation of ZG0Cr13Ni4Mo were established based on multi-component alloy phase diagrams. Different nucleation, growth and diffusion models were used for the three stages of phase transformation. 2D and 3D microstructure of ZG0Cr13Ni4Mo stainless steel casting can be simulated. Two kinds of large sample castings were cast for experimental verification of simulation results. Then microstructure morphologies were observed by using optical microscope and SEM. The grain size of austenite, the number of martensite in austenite grains and the spacing of the lath martensite were measured. The simulation results were compared with experiments and they were in agreement.
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柳百成, ZHANG Guangyue, JING Tao, LIU Baicheng, ZHAO Daiping
2002 International Mechanical Engineering Congress and Exposition November 17-22, 2002, New Orleans, LA USA,-0001,():
-1年11月30日
Numerical simulation of solidification microstructure of aluminum alloy casting is studied by using a macro-micro coupled method. Different mesh sizes and time steps are used to calculate the macro temperature field and the crystal growth. The microstructure simulation is conducted by selecting a macro cell in the central region of the aluminum casting, and then the initial distribution of the temperature in the micro domain is obtained by interpolating the temperature of the macro cells near the selected cell. The crystal growth is controlled by the phase field equation, and the mathematical model also includes mix solution conservation equation and energy conservation equation to compute the distribution of the solution and the temperature. Noise is introduced to simulate the side branches. To describe the heterogeneous nucleation the Gaussian distribution is applied. The interface undercooling is considered to be the sum of thermal, solute and curvature effects. The 2-D dendritic growth morphology, the 3-D dendritic growth morphology and the crystal sizes in the region are simulated. The simulation results are compared with those obtained by experiments.
Phase field method,, Microstructure,, Macro-Micro Coupled,, Aluminum alloy
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柳百成, 许庆彦, 冯伟明, 熊守美
ACTA METALLURGICA SINICA, 2002, (8): 799~803,-0001,():
-1年11月30日
提出一种新的模拟铝合金枝晶生长的随机性方法,建立了简化的枝晶形状的物理与数学模型,并提出了一种形状函数来描述晶粒的外部轮廓。基于简化的晶粒形状,采用坐标变换技术来描述过冷液相中晶粒的生长过程及其对周围节点的捕获过程。根据上述思想,开发了等轴晶生长的模拟程序,并进行了二维计算。为了验证模拟结果,浇注了金属型和砂型试样。模拟结果表明,金属型铸造晶粒尺寸较小,砂型铸造的较大。模拟结果与金相观察结果相符。
随机性模拟,, 微观组织模拟,, 铝合金,, 晶粒形状,, 形核与生长模型
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柳百成, 赵海东), 柳百成), 房贵如), 熊守美)
ACTA METALLURGICA SINICA, 2001, (10): 1107~1111,-0001,():
-1年11月30日
建立了球铁稳定系和介稳定系共晶转变的数学模型,同时考虑了元素微观偏析和不同组织所产生潜热的影响。对球铁试样进行了定量金相实验分析,并与模拟结果进行了比较。结果表明,石墨球数量和尺寸以及碳化物体积分数的模拟结果与实验结果吻合。对白口共晶生长、碳化物形貌与凝固方式的关系进行了分析和讨论,表明凝固分析和模拟可以在一定程度上预测球铁中白口共晶的生长及最终碳化物的形貌。
球墨铸铁,, 白口共晶,, 碳化物形貌,, 数值模拟
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柳百成, 韩志强, 沈厚发
ACTA METALLURGICA SINICA, 2002, (1): 35~40,-0001,():
-1年11月30日
通过数学推导,对描述合金凝固过程传输现象的连续介质模型(Bennon和Incropera,1987),体积平均模型(Beckermann和Viskanta,1988),Poirier模型(P0irier等人,1990-1991),以及柱状枝晶凝固模型(schneider和Beckermann,1995)的质量、动量、能量,溶质守恒方程进行了比较。结果表明,基于各相密度、导热系数、比热容分别相等且为常数,以及渗透率各向同性、液相粘度为常数的假设,各模型的守恒方程均可以推导出相同的简化方程。
合金,, 凝固,, 传输现象,, 数学模型
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【期刊论文】Research on Macro and Micro Modeling of Solidification Process of Shaped Casting
柳百成, Baicheng Liu, Shoumei Xiong, Qingyan Xu
,-0001,():
-1年11月30日
Facing the market economy and global challenge the development of casting industry is critical to the national economy. To upgrade the traditional casting industry by using computer technology is one of the hottest research frontiers studied by many researchers and engineers. Computer simulation of solidification process of shaped casting can assure the quality of casting, optimize the casting technology, shorten the lead time and therefore decrease the developing and manufacturing cost. Recently, numerical simulation of mold-filling and solidification processes of shaped casting both in sand casting and high pressure die casting and prediction of microstructure and property as well have been extensively studied by the authors and put into application in many casting plants with some successful simulation cases.
Shaped casting,, Solidification,, Mold filling,, Stress analysis,, Modeling and simulation
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【期刊论文】Modeling of Stable and Metastable Eutectic Transformation of Spheroidal Graphite Iron Casting
柳百成, Haidong ZHAO and Baicheng LIU
ISIJ International, Vol. 41 (2001), No.9, pp. 986-991,-0001,():
-1年11月30日
In this work, a mathematical model for stable and metastable transformation of SG cast iron, coupling with microsegregation of some elements and latent heat resulted from different phase formation, was presented. The quantitative experimental results of specimens obtained from a step-shape sample casting were compared with the simulation, and two results of nodular counts and sizes agreed quite well. For white eutectic growth in mottled SG iron, the frequent impingement of white eutectic with austenite-graphite bulks might suppress its growth remarkably and result in quite lower growth rate than that from the melt exclusively. Meanwhile, the relationship of morphology of carbides and solidification was discussed, and it was indicated that the growth of white eutectic and carbide morphology could also be predicted by solidification simulation. It was found that neglecting silicon microsegregation, if metastable transformation was advantageous to stable, the simulated carbide fraction was higher, and vice versa.
spheroidal graphite castiron, stable and metastable microstructure, eutectic transformation, modeling and simulation.,
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柳百成, B.C. Liu*, J.W.Kang, S.M. Xiong
Science and Technology of Advanced Materials 2(2001)157-164,-0001,():
-1年11月30日
In order to study the development of thermal stress and to predict the hot tearing and residual stress of shaped casting, two models were used to carry out the stress analysis of the two stages of solidification. The rheological model [H]-[H/N]-[N/S] was used for the quasi-solid zone while the thermo-elasto-plastic model was used for the period after solidification. Coupling the thermal analysis based on the finite different method with the stress analysis based on the finite element method, a FDM/FEM integrated system of thermal stresses analysis during the solidification process was developed. After experimental verification, the system was put into practical application. The analysis results during the quasi-solid zone show that the visco-plastic strain is an important factor for the occurrence of hot tearing. The hot tearing of a case steel casting and the residual stresses and deformation of a hydro-turbine blade steel casting were analyzed and predicted using the system. The simulation and the practical results were basically in agreement.
Numerical simulation, Solidification process, Shaped casting, Thermal stress, Rheological model, Thermo-elatsto-plastic model
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柳百成, LIANG Zuojian, LI Jiarong, LIU Baicheng, XU Qingyan, YUAN Hailong, LIU Shizhong
,-0001,():
-1年11月30日
Single crystal solidification of turbine blades is a key technology for the production of reliable and high efficiency gas turbines. The solidification process of single crystal investment castings causes a number of problems that have to be solved such as the increase of casting defects and complexity of production process. Computer modeling and simulation is helpful to predict the defects and improve the process design. In the paper, a mathematical model for three dimensional simulation of solidification and single crystal growth of investment castings was developed based on CA, mechanism of crystal growth and basic transfer equations such as heat, mass transfer equations. Many factors including constitutional undercooling, curvature undercooling and anisotropy, which had vital influences on microstructure evolution, were considered in the model. Temperature, crystal growth interface and structure defects of investment castings of single crystal superalloy were investigated at withdrawal rates of 4.5mm/min and 7mm/min. Simulated results showed that microstructure evolution and structure defects were predicted reasonably and calculated results were coincident with experimental ones. The study indicated that three dimensional solidification simulation technique is a powerful tool for understanding the fundamental of solidification and the formation of structure defects in single crystal investment castings and finally for optimizing process design.
single crystal,, investment casting,, microstructure evolution,, solidification,, numerical simulation
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