晶界工程处理对Inconel 690TT合金微动磨损行为的影响

Effects of grain boundary engineering treatment on fretting wear behavior of Inconel 690TT alloy

采用热处理加冷轧的晶界工程处理,利用OM,SEM,EBSD和白光干涉仪等研究Inconel 690TT合金在室温与320℃空气中的微动磨损行为。结果表明:经5%冷轧变形及高温短时间退火处理后Inconel 690TT合金的显微组织中低∑重位点阵(CSL)晶界比例达到70%以上;Inconel 690TT合金试样在室温和320℃下的微动磨损体积与摩擦因数均随硬度增加而降低,随晶粒尺寸和低∑CSL晶界比例增加而增大;在相同微动实验参数下,晶粒尺寸越大、低∑CSL晶界比例越高试样的微动运动区域特性倾向于完全滑移,反之倾向于部分滑移;与晶粒尺寸相比,低∑CSL晶界比例对晶界工程处理试样的微动磨损抗力的影响更强,低∑CSL晶界比例越高材料的抗微动磨损能力越差,晶界工程处理不利于提高材料的微动磨损抗力。

The grain boundary engineering(GBE)treatment of heat treatment and cold rolling was adopted.The fretting wear behavior of Inconel 690 TT alloy in air at room temperature and 320℃was studied by OM,SEM,EBSD and white light interferometer.The results show that the proportion of low-∑CSL boundaries of the best GBE sample is more than 70%,which is produced after 5%cold rolling,high temperature and short time annealing.The wear volumes and friction coefficients of the Inconel 690 TT alloy samples at room temperature and 320℃decrease with the increase of hardness and increase with the increase of grain size and low-∑CSL boundary fraction.The fretting zone characteristic of Inconel 690 TT alloy samples with larger grain sizes and higher proportion of low-∑CSL boundaries under the same fretting experimental parameters is prone to full sliding,whereas it tends to partial sliding.Compared with grain size,the low-∑CSL boundary fraction plays a more important role in determining the fretting behavior of GBE samples.The sample with higher fraction of low-∑CSL boundaries has lower resistance to fretting wear,so GBE treatment is inimical to improving the fretting wear resistance of materials.