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Microstructure and Mechanical Properties of Martensitic Stainless Steel 6Cr15MoV

Journal of Iron and Steel Research International 2012年第3期19卷 56-61页

作者： MA Dang-shen1, CHI Hong-xiao1,2, ZHOU Jian1, YONG Qi-long1,2 (1. Institute for Structural Materials, Central Iron and Steel Research Institute, Beijing 100081, China 2. Faculty of Materials science and Engineering, kunming university of science and technology, kunming 650093, Yunnan, China) Institute for Structural Materials Central Iron and Steel Research Institute Beijing China Faculty of Materials science and Engineering Kunming University of Science and Technology Kunming Yunnan China

Martensitic stainless steel containing Cr of 12% to 18%（mass percent） are common utilized in quenching and tempering processes for knife and cutlery steel. The properties obtained in these materials are significantly influ- enced by matrix composition after heat treatment, especially as Cr and C content. Comprehensive considered the hardness and corrosion resistance, a new type martensitic stainless steel 6Crl5MoV has been developed. The effect of heat treatment processes on microstructure and mechanical properties of 6Crl5MoV martensitic stainless steel is emphatically researched. Thermo-Calc software has been carried out to thermodynamic calculation; OM, SEM and TEM have been carried out to microstructure observation; hardness and impact toughness test have been carried out to evaluate the mechanical properties. Results show that the equilibrium carbide in 6Cr15MoV steel is M23 C6 car- bide, and the M23 C6 carbides finely distributed in annealed microstructure. 6Crl5MoV martensitic stainless steel has a wider quenching temperature range, the hardness value of steel 6Cr15MoV can reach to HRC 60.8 to HRC 61.6 when quenched at 1 060 to 1 100 ℃. Finely distributed carbides will exist in quenched microstructure, and effectively inhabit the growth of austenite grain. With the increasing of quenching temperature, the volume fraction of undis- solved carbides will decrease. The excellent comprehensive mechanical properties can be obtained by quenched at 1 060 to 1 100℃ with tempered at 100 to 150 ℃, and it is mainly due to the high carbon martensite and fine grain size. At these temperature ranges, the hardness will retain about HRC 59.2 to HRC 61.6 and the Charpy U-notch impact toughness will retain about 17.3 to 20 J. A lot of M23C6 carbides precipitated from martensite matrix, at the same time along the boundaries of martensite lathes which leading to the decrease of impact toughness when tempered at 500 to 540 ℃. The MaC precipitants also existed in the martensite mat

关键词： martensitic stainless steel microstructure mechanical property

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衰老或肿瘤：癌基因诱导的双向性

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生物化学与生物物理进展 2009年第12期36卷 1530-1535页

作者：司晓宇罗瑛昆明理工大学生命科学与技术学院、衰老与肿瘤分子遗传学实验室昆明650224

在大部分的肿瘤中都发现有癌基因的活化,癌基因的活化被认为是导致肿瘤发生的重要原因.然而,在野生型细胞内,癌基因的活化可以诱导细胞衰老,称为癌基因诱导的细胞衰老(oncogene-induced senescence,OIS),从而抑制进一步的肿瘤发生.因而... 详细信息

在大部分的肿瘤中都发现有癌基因的活化,癌基因的活化被认为是导致肿瘤发生的重要原因.然而,在野生型细胞内,癌基因的活化可以诱导细胞衰老,称为癌基因诱导的细胞衰老(oncogene-induced senescence,OIS),从而抑制进一步的肿瘤发生.因而,癌基因的活化具有诱导衰老或肿瘤的双向性.DNA损伤调控反应(DNA damage checkpoint response,DDR)是细胞应对DNA损伤时感应损伤,从而延迟或阻滞细胞周期进程的一种分子信号传递通路,是诱导细胞衰老的重要机制.癌基因的活化可以引发DNA损伤信号的产生,从而激活DDR,诱导细胞衰老.在DDR异常时,癌基因的激活可引发DNA的过度复制与细胞的过度增殖,并导致基因组不稳定性的积累,最终导致肿瘤发生.DDR的完整性决定了癌基因诱导的双向性.DDR在癌基因诱导中的重要作用,提示了保持和恢复DDR的完整性可以作为肿瘤预防和治疗的新方向.

关键词：癌基因细胞衰老癌基因诱导的衰老 DNA损伤调控反应 DNA过度复制

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Tin Mineralization in the Laojunshan Area, Southeast Yunnan, ***

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昆明理工大学学报(自然科学版) 1998年第6期 3-7页

作者： Song Huanbin (Deans Office, kunming university of science and technology, kunming 650093)

ＴｈｅｒｅｈａｖｅｂｅｅｎｔｗｏｗｅｌｋｎｏｗｎｔｉｎｏｒｅａｒｅａｓｉｎＣｈｉｎａ．ＯｎｅｉｓＧｅｊｉｕｔｉｎｏｒｅａｒｅａｉｎＹｕｎｎａｎＰｒｏｖｉｎｃｅ，ａｎｄｔｈｅｏｔｈｅｒｉｓＤａｃｈａｎｇｔｉｎｏｒｅａｒ... 详细信息

ＴｈｅｒｅｈａｖｅｂｅｅｎｔｗｏｗｅｌｋｎｏｗｎｔｉｎｏｒｅａｒｅａｓｉｎＣｈｉｎａ．ＯｎｅｉｓＧｅｊｉｕｔｉｎｏｒｅａｒｅａｉｎＹｕｎｎａｎＰｒｏｖｉｎｃｅ，ａｎｄｔｈｅｏｔｈｅｒｉｓＤａｃｈａｎｇｔｉｎｏｒｅａｒｅａｉｎＧｕａｎｇｘｉｐｒｏｖｉｎ...

关键词： Tin the Yunnan Mineralization P.R.China Southeast Area Laojunshan

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Finite Element Method Analysis of Stress Field Considering Thermal Coupled Force During Laser Process

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Journal of Shanghai Jiaotong university(science) 2000年第1期5卷 100-106页

作者： Gang Fan,Yihong Guan, Jiatao Zhang, Honggang Wang kunming university of science and technology, kunming, 650093, China

According to the prominent characteristic of rapid heating and cooling velocity in process of laser phase transformation hardening, it is important and necessary to consider the couple relation among temperature, phase transformation and stress. Based on the above, a mathematical model to analyze transformation and to reflect its characteristic is presented. Also temperature field control equation relative to stress and phase transformation is set up and thermal elastoplastic constitutive equation containing phase transformation was derived, In a given yield condition, temperature and stress field are numerically calculated by means of Finite Element Method. The result indicates the calculation value coincides with result of test Stress especially thermal stress varied violently in process of laser phase transformation hardening, which leaded to the residual stress on the surface and accorded to the fact. This process can improve the characteristic of material, so it is significant to study on thermal stress of laser quenching, to discuss the effect of phase transformation and stress on temperature, to optimize the laser quenching process and to improve the synthetic mechanic properties of quenching material.

关键词： Laser Phase Transformation Hardening Constitutive Equation Thermal Stress Residual Stress Couple Couple

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INTENSIFICATION OF TECTONIC MOVEMENT SINCE THE CENOZOIC AND ITS EFFECT ON GEOLOGICAL ENVIRONMENT IN NORTHWESTERN YUNNAN,CHINA

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Geotectonica et Metallogenia 2000年第1期24卷 1-9页

作者： LI Feng and XUE Chuan－ dong (Department of Earth science,kunming university of science and technology, kunming 650093,China)

Since the Cenozoic,especially the Quaternary,tectonic movement has been strengthening in northwestern Yunnan,*** tectonic elevation rate of mountains changed from 0.3～ 1.7 mm/a(before the Holocene)to 2～ 7.1 mm/a(after the Holocene).The subsiding velocity of the Holocene basins increases by 1～ 2 orders of magnitude relative to the *** displacement rate of the Quaternary fractures increases *** crustal stress values become *** deformation speeds *** activities *** flux anomaly is *** strengthening tectonic activities will result in changes of the topographic frame of northwestern Yunnan,worsen mountain geologic disaster,speed up the contraction of lakes and decrease the regional ***,human beings will face the challenge of a more rigorous environment.

关键词： Neotectonic movement tendency environmental effects northwestern Yunnan

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A Perfect Representation of the Limit on Solutions of a Difference Equation

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昆明理工大学学报(自然科学版) 1998年第2期 156-160+164页

作者： Cui Hongzhi (Department of Mathematics Yunnan,Polytechnic university,kunming 650051) Li Cunfu (Depatment of Basic sciences,kunming university of science and technology,kunming 650093)

ＡＰｅｒｆｅｃｔＲｅｐｒｅｓｅｎｔａｔｉｏｎｏｆｔｈｅＬｉｍｉｔｏｎＳｏｌｕｔｉｏｎｓｏｆａＤｉｆｅｒｅｎｃｅＥｑｕａｔｉｏｎＣｕｉＨｏｎｇｚｈｉ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓＹｕｎｎａｎ，Ｐｏｌ... 详细信息

ＡＰｅｒｆｅｃｔＲｅｐｒｅｓｅｎｔａｔｉｏｎｏｆｔｈｅＬｉｍｉｔｏｎＳｏｌｕｔｉｏｎｓｏｆａＤｉｆｅｒｅｎｃｅＥｑｕａｔｉｏｎＣｕｉＨｏｎｇｚｈｉ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓＹｕｎｎａｎ，ＰｏｌｙｔｅｃｈｎｉｃＵｎｉｖｅｒｓｉｔ...

关键词： difference equation solution integer sequence convergence

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STUDY ON TURBULENCE FEATURES NEAR AN OSCILLATING CURVED WALL

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Journal of Hydrodynamics 2007年第3期19卷 255-263页

作者： WANG Wen-quan ZHANG Li-xiang YAN Yan GUO Yakun Department of Engineering Mechanics Kunming University of Science and Technology Kunming 650051China Department of Engineering University of Aberdeen Aberdeen AB24 3UE UK

In pursuit of possibly true turbulent characters and for exploring a change in turbulence structures near an oscillating flexible wall-curved surface, a sinusoidal oscillation mode was forced to a curved wall, whose vibrations disturbed the flow with an interacting effort between the fluid and the structure. The methodology used was the Large Eddy Simulation （LES） with fluid-structure interaction. The oscillating configuration was on a Fourier sinusoidal mode from the measurements of a Francis hydro turbine blade vibration. The effects of the vibration on the skin friction coefficient, vortices, turbulent coherent structures, and other statistical quantities were studied. The results showed that the streamwise velocity gradient along the normal direction and the normal velocity gradient along the spanwise direction were considerably increased within the viscous sublayer because of the oscillating wall, which additionally caused the low speed streaks to stay away from the wall and the high-momentum flows to be toward the wall. As a result, the streamwise vortices were much more elongated along the downstream to get an energy balance, and the wall skin friction coefficient or the wall friction velocity rose up.

关键词： turbulent flow turbulent structure Large-Eddy Simulation (LES) fluid-structure interaction

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W-型单模单偏振光纤中的硼掺杂和带宽

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中国激光 2002年第1期29卷 52-56页

作者：季敏宁昆明理工大学理学院光纤技术研究中心云南昆明650093

分析了W 型单模单偏振光纤中 ,椭圆内包层硼掺杂量与单模单偏振带宽的关系 ,得出了长W 型单模单偏振光纤的带宽与内包层硼掺杂量的大小无关 ,它只由光纤几何结构以及内包层折射率深度确定 ,而对于短W 型单模单偏振光纤 ,硼掺杂量的增加... 详细信息

分析了W 型单模单偏振光纤中 ,椭圆内包层硼掺杂量与单模单偏振带宽的关系 ,得出了长W 型单模单偏振光纤的带宽与内包层硼掺杂量的大小无关 ,它只由光纤几何结构以及内包层折射率深度确定 ,而对于短W 型单模单偏振光纤 ,硼掺杂量的增加可以增大截止基模能量损耗 ,从而适度提高其消光比和有效带宽。

关键词： W-型单模单偏振光纤硼掺杂量带宽折射率

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吸收膜的选择及其在红外激光金属表面处理中的应用

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中国激光 2002年第11期29卷 1023-1026页

作者：陈庆华昆明理工大学材料与冶金工程学院材料系云南昆明650093

研究了二氧化碳激光在吸收膜-金属表面的吸收问题,通过研究电磁学、光学常数和表面吸收率的关系,总结出在金属材料表面提高吸收率的表面膜材料的选择原则和有关最佳材料范围。

关键词：红外激光激光-物质相互作用吸收率表面吸收膜陶瓷溶胶-凝胶玻璃金属表面处理

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Empirical Research on Enterprise Organizational Capability Evaluation System Based on AHP

Empirical Research on Enterprise Organizational Capability E...

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2010 International Conference on Future Information technology and Management Engineering (FITME 2010)

作者： Kexing Faculty of management and economics kunming university of science and technology kunming China Jinxian Faculty of management and economics kunming university of science and technology kunming China

Enterprise organizational capability is the source to maintain enterprise competitive advantage and cultivate enterprise core *** to scientifically evaluate the effect of organizational capability is the key to keep on top of organizational ***,this paper introduces the enterprise circumstances and the concept of the enterprise organizational ***,in reviewing enterprise organizational capability and the evaluation index,construct evaluation index system of enterprise organizational capability ***,through the application to AHP,examples demonstrate the application of this evaluation method,in order to provide reference for enterprise organizational capability evaluation.

关键词： AHP enterprise organizational capability evaluation.

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