磨盘材料和温度对TC11合金磨损行为的影响

Effect of Counterface Materials and Temperature on Wear Behavior of TC11 Alloy

对TC11合金与两种不同硬度的GCr15和W6Mo5Cr4V2在25、400和600℃对摩时的磨损行为进行了研究.利用SEM、EDS以及XRD等对试样磨面和剖面的形貌、成分及结构进行了观察与分析.结果表明:TC11合金与三种不同硬度的磨盘对摩后,在25℃,磨损率均随载荷的增加而增加,且磨损率较高,磨损表面呈现黏着和犁沟特征,磨损机理为黏着磨损与磨粒磨损;在400℃,合金与低硬度GCr15对摩时,磨损表面被黑色光滑氧化物所覆盖,磨损机理为氧化轻微磨损;与高硬度GCr15对摩时,在50和150 N,磨损表面呈现黑色光滑氧化物和犁沟特征,磨损机理为氧化轻微磨损和磨粒磨损;在250 N,磨损机理为黏着磨损与磨粒磨损;与W6Mo5Cr4V2对摩时,磨损表面呈现犁沟特征,磨损机理为磨粒磨损;在600℃,TC11合金的磨损率均较低,且与两种不同硬度GCr15对摩后的磨损率均低于与W6Mo5Cr4V2对摩的磨损率,磨损机理均为氧化轻微磨损.在25和600℃,磨盘材料对合金的磨损率具有不同的影响,但不影响合金的磨损机理;在400℃,磨盘材料既影响磨损率也影响磨损机理.

Wear behaviors of TC 11 alloy pin sliding against GCrl 5 disk with different hardness or W6Mo5Cr4V2 disk were investigated at 25 ℃, 400 ℃ and 600 ℃. The morphologies, cross-section morphologies, composition and structure of worn surfaces of TC 11 alloy were observed and analyzed by using scanning electron microscopy, energy dispersive spectrum and X-ray diffraction. The results show that wear rates of TC 11 alloy were high and increased with an increase of load at 25 ℃, adhesive wear and abrasive wear prevailed. At 400 ℃, worn surface was covered with black smooth oxides for TC 11 sliding against GCrl 5 （low hardness）, and the main wear mechanism was mild oxidative wear. In sliding against GCrl5 （high hardness） at 50 and 150 N, worn surface showed the characteristics of black smooth oxides and furrow, which indicate the mild oxidative wear and abrasive wear, at 250 N, adhesive wear and abrasive wear were dominated. The furrows on the worn surface of TC11 alloy indicate abrasive wear in sliding against W6Mo5Cr4V2. At 600 ℃, wear rates were low and wear rates ofTC11 alloy sliding against GCrl5 with two different hardness were both lower than that against W6MoSCr4V2, and mild oxidative wear prevailed. At 25 and 600 ℃, wear mechanism was the same for TC11 alloy against different counterface materials. At 400 ℃, wear mechanism varied from counterface material to counterface material of TC 11 alloy.