304不锈钢表面等离子渗硼高温摩擦磨损性能的研究

发布时间：2018-05-21 19:23

  本文选题：双辉等离子合金化技术 + 渗硼　； 参考：《太原理工大学》2015年硕士论文

【摘要】：奥氏体不锈钢具有良好的加工性、光洁亮丽的外观,优异的耐腐蚀性和强韧性，被广泛应用于要求机械性能良好的设备和工件上，如海洋、宇航、军工、化工、能源、日常生活用品等方面。工件工作时表面会承受力的作用，但304奥氏体不锈钢表面硬度低，承载力弱，易产生严重的粘着磨损，由其制成的零件易在表面或者从表面开始发生失效，阻碍304奥氏体不锈钢的进一步应用。为了提高零件在服役期间的可靠性，，单纯依靠改变材料整体的性能难度高，耗费大，因此，表面改性技术开始被人们研究和应用。双辉等离子合金化技术能够在材料表面制备出性能良好的改性层，明显提高材料表面的硬度和耐磨性。本文利用双辉等离子表面渗B技术，在304不锈钢表面制备渗硼层，提高304不锈钢室温及高温下的耐磨性。 通过对渗硼层的表面形貌、截面形貌、成分分布、相结构、表面硬度、室温及高温摩擦磨损性能的分析，得出如下结论： （1）经过双辉等离子渗硼处理后，304不锈钢改性层表面较基体试样粗糙。硼化层厚度随工艺温度升高和保温时间的延长逐渐增加，材料表面硬度也随之显著提高。当工艺温度为1000℃，保温3h时，表面形成成分呈梯度分布的硼化层，渗层厚度为18.2μm，表面硬度为1556HV0.2，约为基体试样的7.5倍。硼化层主要由FeCrB、Fe2B、FeB和(FeNi)3B相组成。 （2）在室温和高温干摩擦条件下，随着渗硼工艺温度的升高和保温时间的延长，304不锈钢的耐磨性呈递增趋势，其原因是渗硼层提高了基材表面硬度和抗高温氧化能力。渗硼试样的耐磨性提高的程度表现为600℃＞300℃＞室温，这主要是由于高温下硼化层的抗高温氧化性表现得更为明显。 （3）高温磨损环境（600℃）下，基体试样的主要磨损机制是严重粘着磨损伴随着严重的氧化磨损，渗硼试样的磨损机理转变为磨粒磨损、轻微的粘着磨损和氧化磨损，氧化程度较基体试样轻得多。
[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

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