康永林
半固态加工理论与技术、新型汽车板开发及成形性研究、薄板坯连铸连轧工艺技术及新产品开发、程控变截面轧制技术、金属成形过程数值模拟仿真及成形过程微观缺陷定量分析等科研开发
个性化签名
- 姓名:康永林
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学术头衔:
博士生导师
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学科领域:
材料合成与加工工艺
- 研究兴趣:半固态加工理论与技术、新型汽车板开发及成形性研究、薄板坯连铸连轧工艺技术及新产品开发、程控变截面轧制技术、金属成形过程数值模拟仿真及成形过程微观缺陷定量分析等科研开发
康永林,北京科技大学 材料学院材料加工与控制工程系,系主任,博士、教授、博士生导师。主要研究方向,连铸连轧工艺控制理论技术,新一代汽车板工艺及成形,材料成形过程计算机模拟仿真,半固态加工理论与技术等。先后获部级科技进步一等奖4项,二等奖2项,三等奖3项, 1993年被评选为北京高校青年学科带头人,并获IET优秀青年教师奖,宝钢优秀教师奖,2004年获全国五一劳动奖章和首都劳动奖章。主要社会兼职有,中国冶金新技术推广中心变截面轧制技术推广中心主任,北京金属学会压力加工分会主任,《钢铁》,《中国表面工程》,《轧钢》杂志编委。 近年来,主要从事半固态加工理论与技术、新型汽车板开发及成形性研究、薄板坯连铸连轧工艺技术及新产品开发、程控变截面轧制技术、金属成形过程数值模拟仿真及成形过程微观缺陷定量分析等科研开发。负责完成的国家攻关项目、自然科学基金项目、国际合作项目、部委课题和企业合作项目等15项,负责完成的国家科委重点推广项目“程控变截面轧制设备与技术”及厂协项目三十余项。通过省部级以上鉴定项目10项。主要论著有:《现代汽车板质量控制及成形性》(专著),《金属材料半固态加工理论与技术》(合著),《粉末塑性加工理论及应用》(合著),《陶瓷镀层》(译著),《轧制工程学》(编著),在国内外发表学术论文260余篇,已获国家专利9项。指导毕业硕士研究生35名,毕业博士研究生9名,指导博士后4名。
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821
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康永林, Hao Yu, Yonglin KANG† and Jie FU
J. Malter, Sci. Technol., Vol. 18 No.6, 2002,-0001,():
-1年11月30日
The microstructure and misorientation of ultrathin hot strip were analyzed by CSP technology using electron back scattered diffraction (EBSD) method and Autoforge finite element program. The experimental resuks showed that the finishing hot rolling microstructures were the mixture of recrystallized and deformed austenite. After phase transformation, ferrite grains embody substructures and dislocations, leading to the high strength and relatively low elongation rate of the ultrathin hot strip. The FEM simulation of strain mode and distribution in deformation area has been fulfilled. The simulation results are in good agreement with the theoretical analysis and experimentar results.
CSP, Electron back scattered diffraction, Texture, Finite element method
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【期刊论文】Study of mechanism on microstructure refinement during compact strip production process
康永林, Hao Yu a, Yonglin Kang a, *, Kelu Wang a, Jie Fu b, Zhongbing Wang c, Delu Liu d
Materials Science and Engineering A363(2003)86-92,-0001,():
-1年11月30日
In this study, microstructures of 1.9mm hot strip steel produced by compact strip production (CSP) are investigated by using optical metallograph observation and electron back-scattered diffraction (EBSD) data to deduce the status of hot rolled austenite before phase transformation, because the evolution of hot rolled austenite is important to provide information for the microstructure refinement. The experimental results show that the finishing hot rolled microstructure is a mixture of recrystallized and deformed austenite, and the percentage of recrystallized austenite is greater than that of the deformed austenite. At last, microstructure evolution of austenite is modeled based on chemical compositions and techniques of producing 1.9mm hot strip. The simulation results agree well with experimental data. Analysis shows that microstructure refinement, recrystallization and supercooling rate are the primary causes to fine microstructure.
Microstructure, Compact strip production, EBSD, Texture, Recrystallization, Phase transformation
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康永林, Yonglin Kang a, *, Hao Yu a, Jie Fu b, Kelu Wang a, Zhongbing Wang c
Materials Science and Engineering A351(2003)265-271,-0001,():
-1年11月30日
Morphology and precipitation kinetics of AlN were investigated both experimentally and using a predictive model in hot strip of low carbon steel produced by compact strip production (CSP), a process for the production of hot strip from a continuously cast thin slab using direct charging. By an electrolytic dissolution technique and TEM analysis, the shapes of AlN were cube or plate, the precipitates were uniform and very fine, with average size less than 8nm. The paper presents a model to describe the precipitation kinetics of AlN under thermomechanical process conditions of CSP, which predicted volume fraction evolution and the precipitate size of strain induced precipitation on the basis of classical nucleation theory. For the process conditions of this paper, about 3s time was sufficient for appreciable strain induced precipitation occurred immediately and entirely on dislocations after the sixth finishing rolling pass, and the computing radius of precipitate was 2 nm, which was in good agreement with experimental data. The differences of AlN precipitation between CSP and conventional process are also discussed.
Morphology, Strain induced precipitation, Precipitation kinetics, Compact strip production, TEM
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康永林, 于浩, 王克鲁, 傅杰, 柳得橹, 王中丙, 毛新平, 陈贵江
钢铁,2001,38(8):20~26,-0001,():
-1年11月30日
通过热力学计算和析出物形貌观察表明,析出物对铸坯晶粒的生长起到一定的限制作用。6道次连轧模拟计算结果与观察结果吻合较好,同时也表明,再结晶是组织细化的主要原因。各种强化方式定量计算的结果表明,细晶强化是主要的强化方式,沉淀强化和位错强化次之,且它们对屈服强度的贡献相近。
CSP, 析出, 强化, 组织细化, 再结晶①
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康永林, 柳得橹, 傅杰, 李晶, 于浩, 王元立, 王中丙, 李烈军
钢铁,2001,36(6):40~43,-0001,():
-1年11月30日
对珠钢CSP线生产的低碳钢(ZJ400)连铸坯及轧后的组织特征观察和硬度测定表明:CSP线生产的连铸坯铸态组织为较细的树枝晶,枝晶宽度为几微米到30μm, 靠近表面层的枝晶宽度与中心区域差别很小。经第一道次50%变形后, 板坯组织明显细化, 具有局部“树枝晶”特征, “枝晶”宽度约5μm, 中心区域硬度降低。成品薄板的晶粒尺寸平均为5μm,大多呈尖角型。变形区应力、应变及温度分布的有限元模拟分析结果与实际组织分析结果吻合。
薄板坯连铸连轧, 低碳钢, 显微组织, 有限元分析①
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【期刊论文】Microstructure Study on Semi-solid 60Si2Mn during Compressing
康永林, Yonglin Kang, Xiongfei Yang, Renbo Song, Weimin Mao, Maosheng Yang
Journal of University of Science and Technology Beijing Vol. 8 (2001), No.2, p. 115,-0001,():
-1年11月30日
The microstructure behavior and deformation mechanism of semi-solid 60Si2Mn fabricated by electromagnetic stirring under different deformation conditions during thixoforming are studied by means of Gleeble-1500 thermal-strain-stress simulator. The microstructure of deformed 60Si2Mn and that of the non-deformed are compared. The results show that the grain size within deformation zone decreases as the amount of deformation increases or deformation temperature decreases, but deformation rate has small effect on grain size when the rate is very low. Besides, there is a critical amount of deformation to reduce grain size. These results offer theoretical and experimental basis for further producing semi-solid material with high melting temperature and direct forming of semi-solid slurry.
semi-solid, microstructure, grain size, segregation, reduction
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【期刊论文】Dislocation Densites of Deformed Steel Sheets Based on Positron Annihilation
康永林, Yonglin Kang, Xianjin Wang
Journal of University of Science and Technology Beijing 1998, Vol. 5, No.l: 47,-0001,():
-1年11月30日
The variation regularity of dislocation densites of some deformed steel sheets under three kinds of strain paths as uniaxial tension, plane strain and equal biaxial stretching was investigated by means of positron lifetime spectrum and Doppler-broadening techniques. The results show that the increasing rate of dislocation densites is related to the plastic strain path. A relationship between the increasing rate of micro-defects, macro-instability and forming limits during the process of steel sheet forming was got based on analyzing the mechanism of dislocation density increasing under different stress-strain conditions.
positron annihilation, dislocation, steel sheet, strain path
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康永林, 宋仁伯, 董洪波, 任学平
机械工程学报,2002,38(6):83~87,-0001,():
-1年11月30日
采用多孔材料的几何模型,利用MARC软件对弹簧钢60Si2Mn半固态轧制进行了有限元模拟,分析了在热力耦台条件下,将半固态材料视为可压缩的刚一粘塑性体时的应力场、速度场、温度场的状况,并研究了不同变形条件下,应力场、速度场的变化规律,由此所进行的模拟工作较好地反映了半固态轧制过程中金属的变形规律。
多孔材料, 有限元分析, 半固态, 热力耦合, 可压缩刚一粘塑性体, 轧制
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90浏览
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康永林, 康永林), 王波), 李冠成)
北京科技大学学报,2000,22(5):451~455,-0001,():
-1年11月30日
利用ANSYS有限元软件模拟分析了树指复合轻质板的变曲成形性能。轻质板是夹层板,弯曲过程中,外层钢板易产生相对错动量。因此对轻质板内部的应力应变状态进行分析,研究模具参数和板料的复合结构以及中间层树脂的材料参数对错动量的影响。同时对弯曲后的回弹和剪切应力的情况进行了分析。
树脂, 夹层钢板, 弯曲, 成形性, 数值模拟
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【期刊论文】薄鋼板の引張変形にちる肌荒ばす成長挙動変形経路の影響*
康永林, 康永林**, 木原諄二***, 相澤龍彥***, 王先進****, 唐荻****
(日本塑性加工学会社,1999,32:274~279,-0001,():
-1年11月30日
Experimental study was caried out to porovide a comperhensive formulation of surface roughness on the formed steel sheet. Surface microscopic observation, surface roughness measurment and pole figure analysis are preformed on the sheets deformed in the three different modes, i.e., uniaxial, plane strian and balanced biaxial tensions.It is found that the state of slip steops. which result from the crystrallographic sliding and rotation. depends on the forming mode. Tshe rotation in an earlier stage of forming is more remarkalble than plastic strain is indepedent of the defrormation mode.
surface roughness,, steel sheet,, forming path,, pole figure,, crystallographic slip,, roatation,,
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