【作者】 曹月；

【导师】 周宏；

【作者基本信息】 吉林大学 ， 材料加工工程， 2006， 硕士

【摘要】 生物体为了适应环境和满足生存需要,总是选择具有最大环境适应性的体表耦合形态、表层结构和成分组成,使生物体具有特殊的性能和功能,这是自然生物体表多种因素一致联合,耦合作用的结果。在本论文研究中,根据生物耦合这一理论,采用激光加工的方法,把材料的表面形态,单元体与表层连结结构以及单元体各种性能不同组织的合理镶嵌和分布等有机的耦合起来,在材料表面形成类似生物体表的非光滑形态,通过这种仿生制造技术,形成抗热疲劳性优良、材料和制造成本低廉的新型仿生耦合材料。就单元体与表层连结结构对材料抗热疲劳性能的影响,曾单独发表了一篇SCI论文,详细阐明了3Cr2W8V在加工成不同单元体连结结构时的抗热疲劳性能;本课题组其他成员利用激光仿生耦合技术在45#钢、3Cr2W8V、H13、HD表面做了大量热疲劳及磨损试验,都得到了很好的试验效果,相应发表了多篇SCI和EI论文。本论文是在此基础上,进一步研究了仿生耦合单元体对提高材料抗热疲劳性能的影响,为以后研究仿生耦合技术提供理论基础及参考依据。更多还原

【Abstract】 At present, 60%-90% industry productions are processed by mould and the total amount of the mould steel is 400 thousand ton per year. The production value of the mould industry is 53 billion RMB in 2004 and is increased to more than 60 billion RMB in 2006. It is estimated that the production value of the mould steel which will increased by 30% on average will increased 60% at the field of the cars and motor cars. Thermal fatigue (TF) is a leading failure of hot working die steels. It has been reported that 60~70% failures have been caused by TF among all the failures of hot working die steels. Therefore, it is of great importance for the development of the economy to improve the TF property of hot working die steels. The TF research of hot work die steels is a representative orientation in the field of the TF research.It is found by biomimetic reach that the nature creatures always choose the best way of their unsmooth shape, surface structure and component buildup to gain the best functions through millions and thousands year’s evolutions. It is the coupling functions that form the special features of the organism. Laser can be used to conduct selective and precision manufacture because the heat effective area is small, the direction of the beam is good and the spot of the beam can be focused to the wave length degree. Therefore, the laser has been chosen to process the unsmooth units imitating the configuration from the organisms, such as: the column unit designed from the chest structure of the step armoure creature; the parallel dyke unit designed from the structure on the surface of the shell which is most made of calcium carbonate and with the tiny ingredient of organic substance. The compound system has especially better rupture toughness than man-made porcelain; the tilted dyke and gridding units designed by the structure of the leaves whose veins are made of fiber pipe material with high intensity and toughness. The veins in the leaves act as bones to support the body to repel the changing climate of更多还原