發(fā)布時間：2018-05-21 19:23

  本文選題：雙輝等離子合金化技術(shù) + 滲硼　； 參考：《太原理工大學(xué)》2015年碩士論文

【摘要】：奧氏體不銹鋼具有良好的加工性、光潔亮麗的外觀,優(yōu)異的耐腐蝕性和強(qiáng)韌性，被廣泛應(yīng)用于要求機(jī)械性能良好的設(shè)備和工件上，如海洋、宇航、軍工、化工、能源、日常生活用品等方面。工件工作時表面會承受力的作用，但304奧氏體不銹鋼表面硬度低，承載力弱，易產(chǎn)生嚴(yán)重的粘著磨損，由其制成的零件易在表面或者從表面開始發(fā)生失效，阻礙304奧氏體不銹鋼的進(jìn)一步應(yīng)用。為了提高零件在服役期間的可靠性，，單純依靠改變材料整體的性能難度高，耗費(fèi)大，因此，表面改性技術(shù)開始被人們研究和應(yīng)用。雙輝等離子合金化技術(shù)能夠在材料表面制備出性能良好的改性層，明顯提高材料表面的硬度和耐磨性。本文利用雙輝等離子表面滲B技術(shù)，在304不銹鋼表面制備滲硼層，提高304不銹鋼室溫及高溫下的耐磨性。 通過對滲硼層的表面形貌、截面形貌、成分分布、相結(jié)構(gòu)、表面硬度、室溫及高溫摩擦磨損性能的分析，得出如下結(jié)論： （1）經(jīng)過雙輝等離子滲硼處理后，304不銹鋼改性層表面較基體試樣粗糙。硼化層厚度隨工藝溫度升高和保溫時間的延長逐漸增加，材料表面硬度也隨之顯著提高。當(dāng)工藝溫度為1000℃，保溫3h時，表面形成成分呈梯度分布的硼化層，滲層厚度為18.2μm，表面硬度為1556HV0.2，約為基體試樣的7.5倍。硼化層主要由FeCrB、Fe2B、FeB和(FeNi)3B相組成。 （2）在室溫和高溫干摩擦條件下，隨著滲硼工藝溫度的升高和保溫時間的延長，304不銹鋼的耐磨性呈遞增趨勢，其原因是滲硼層提高了基材表面硬度和抗高溫氧化能力。滲硼試樣的耐磨性提高的程度表現(xiàn)為600℃＞300℃＞室溫，這主要是由于高溫下硼化層的抗高溫氧化性表現(xiàn)得更為明顯。 （3）高溫磨損環(huán)境（600℃）下，基體試樣的主要磨損機(jī)制是嚴(yán)重粘著磨損伴隨著嚴(yán)重的氧化磨損，滲硼試樣的磨損機(jī)理轉(zhuǎn)變?yōu)槟チＤp、輕微的粘著磨損和氧化磨損，氧化程度較基體試樣輕得多。
[Abstract]:Austenitic stainless steel has good processability, bright appearance, excellent corrosion resistance and toughness. It is widely used in equipment and workpiece that require good mechanical properties, such as ocean, aerospace, military industry, chemical industry, energy, etc. Daily necessities, etc. The surface of 304 austenitic stainless steel is low in hardness, weak in bearing capacity, and prone to severe adhesion wear, and the parts made from the workpiece are prone to failure on or from the surface. Hinders the further application of 304 austenitic stainless steel. In order to improve the reliability of the parts during service, it is difficult and expensive to change the properties of the whole material simply. Therefore, the surface modification technology has been studied and applied. The double glow plasma alloying technology can prepare the modified layer with good properties on the surface of the material, which can obviously improve the hardness and wear resistance of the material surface. In this paper, boronizing layer was prepared on 304 stainless steel surface by double glow plasma infiltration technique. The wear resistance of 304 stainless steel at room temperature and high temperature was improved. Based on the analysis of the surface morphology, cross-section morphology, composition distribution, phase structure, surface hardness, friction and wear properties at room temperature and high temperature of boronizing layer, the following conclusions are obtained: 1) after double glow plasma boronizing treatment, the surface of modified layer of stainless steel is rougher than that of substrate. The thickness of the boride layer increases with the increase of the temperature and the holding time, and the hardness of the boride layer increases significantly. When the temperature is 1000 鈩

本文編號：1920438