本文選題：水介質(zhì)激光仿生 + 灰鐵��； 參考：《長(zhǎng)春工業(yè)大學(xué)》2015年碩士論文

【摘要】：利用激光的靈活性及可局部加工的特點(diǎn),根據(jù)仿生學(xué)原理,所制備的對(duì)生產(chǎn)環(huán)境和使用環(huán)境的要求較低的材料和形狀為耦元的仿生材料是大多數(shù)生產(chǎn)者和使用者歡迎的一種提高材料性能的一種較新的途徑。然而隨著列車的提速,對(duì)制動(dòng)盤(pán)材料有了更高的要求,另外,制動(dòng)盤(pán)在列車制動(dòng)系統(tǒng)中起到了不可替代的關(guān)鍵作用,再加上它所安裝的位置的較難更換,都時(shí)刻催促著研究者對(duì)制動(dòng)盤(pán)的進(jìn)一步研究,能夠通過(guò)研究其工作原理,較準(zhǔn)確的取其精華,去其糟粕。眾所周知,制動(dòng)盤(pán)主要是靠表面摩擦制動(dòng)的,因此大部分摩擦磨損行為都發(fā)生于表面。從仿生原理的角度分析,通過(guò)提高冷卻速率的水介質(zhì)激光仿生處理工藝來(lái)提高其仿生單元體的硬度可以大幅度提高材料的抗磨損性能,這在以往的實(shí)驗(yàn)室基礎(chǔ)的單獨(dú)的磨損實(shí)驗(yàn)中得以驗(yàn)證。然而在實(shí)際工況下,材料除遭受一定程度的磨損外,長(zhǎng)時(shí)間的制動(dòng)摩擦過(guò)程會(huì)使得制動(dòng)盤(pán)表面溫度急劇升高,而頻繁的制動(dòng)會(huì)導(dǎo)致其表面在冷熱交替的作用下發(fā)生磨損,在這種磨損和由冷熱交替環(huán)境而產(chǎn)生的熱循環(huán)應(yīng)力的雙重作用下很容易導(dǎo)致零件的失效。為了了解熱循環(huán)后水介質(zhì)仿生試樣的抗磨損性能,本實(shí)驗(yàn)將仿生單元體表面含有裂紋的仿生灰鐵進(jìn)行了ANSYS應(yīng)力-應(yīng)變分析,發(fā)現(xiàn)雖然仿生灰鐵可大幅度降低普通灰鐵四周的應(yīng)力集中現(xiàn)象,減少材料磨損過(guò)程中發(fā)生的應(yīng)變,但含有裂紋的仿生單元體卻在一定程度上降低了仿生試樣對(duì)普通灰鐵的抗磨損性能的提高幅度。為了得到更好性能的仿生灰鐵,本實(shí)驗(yàn)針對(duì)于具有較好的抗磨損性能的,卻有大量表面裂紋缺陷的激光水介質(zhì)仿生灰鐵試樣,進(jìn)行了復(fù)合水介質(zhì)仿生表面強(qiáng)化處理。另外,本文創(chuàng)新的將經(jīng)過(guò)熱循環(huán)實(shí)驗(yàn)與磨損實(shí)驗(yàn)共同作用后的水介質(zhì)仿生試樣與未經(jīng)熱循環(huán)實(shí)驗(yàn)的傳統(tǒng)磨損實(shí)驗(yàn)進(jìn)行對(duì)比,分析水介質(zhì)仿生單元體材料表面質(zhì)量與經(jīng)熱循環(huán)后水介質(zhì)仿生試樣整體表面變化情況的聯(lián)系及其熱循環(huán)后的磨損性能影響,為水介質(zhì)激光仿生表面加工的灰鐵的工程應(yīng)用提供理論依據(jù)及實(shí)驗(yàn)基礎(chǔ)。與此同時(shí),通過(guò)改善水介質(zhì)單元體表面質(zhì)量的復(fù)合水介質(zhì)激光仿生表面強(qiáng)化的方法,有效提高了其熱循環(huán)后的磨損性能。得到了更適合實(shí)際應(yīng)用環(huán)境的仿生灰鐵材料。
[Abstract]:According to the principle of bionics, using the flexibility of laser and the characteristic of local machining, It is a new way for most producers and users to improve the properties of materials with low requirements for production environment and use environment and bionic materials with the shape of coupling element. However, with the increase of the speed of the train, the material of the brake disc has higher requirements. In addition, the brake disc plays an irreplaceable role in the braking system of the train, and the position it installs is more difficult to replace. All the time urge researchers to further study the brake disc, through the study of its working principle, more accurately select its essence and discard the dross. As we all know, the brake disc is mainly braking by surface friction, so most of the friction and wear behavior occurs on the surface. From the point of view of bionic principle, the hardness of the bionic unit body can be improved greatly by increasing the cooling rate of water medium laser bionic treatment process, and the wear resistance of the material can be greatly improved. This has been verified in previous laboratory-based wear tests. However, under the actual working conditions, the surface temperature of the brake disc will rise sharply after a long period of braking friction, and the frequent braking will cause the surface to wear under the action of alternate heat and cold, except that the material is subjected to a certain degree of wear, and the friction process of braking for a long time will cause the surface temperature of the brake disc to rise sharply. It is easy to lead to the failure of the parts under the double action of the wear and the thermal cycling stress caused by the alternate environment of cold and heat. In order to understand the wear resistance of bionic samples in water medium after thermal cycling, the ANSYS stress-strain analysis of bionic gray iron with cracks on the surface of bionic elements was carried out in this experiment. It is found that although bionic gray iron can greatly reduce the stress concentration around the ordinary gray iron and reduce the strain occurring during the wear of the material, However, the bionic element with cracks decreases the wear resistance of the bionic sample to some extent. In order to obtain bionic lime-iron with better performance, the biomimetic lime-iron samples with good wear resistance but a large number of surface crack defects were treated by bionic surface strengthening of composite water medium. In addition, this paper innovatively compares the water medium bionic specimen with the traditional wear experiment without thermal cycling experiment after thermal cycling experiment and wear experiment. The relationship between the surface quality of water medium biomimetic unit material and the change of the whole surface of the water medium bionic sample after thermal cycling and the effect of thermal cycling on the wear performance are analyzed. It provides a theoretical and experimental basis for the engineering application of lime-iron produced by laser bionic surface processing in water medium. At the same time, by improving the surface quality of the water medium unit, the laser bionic surface strengthening method of the composite water medium can effectively improve the wear performance of the composite water medium after thermal cycling. The bionic lime-iron material which is more suitable for practical application is obtained.
【學(xué)位授予單位】：長(zhǎng)春工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TB391

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