Studies on the surface characteristics of Ti60 alloy induced by turning combined with ball burnishing
Studies on the surface characteristics of Ti60 alloy induced by turning combined with ball burnishing
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Ti60合金车削联合球抛表面特性研究
DOI：
10.1016/j.jmapro.2022.02.019
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发表时间：
2022
影响因子：
6.2
通讯作者：
Zheng Zhou
中科院分区：
文献类型：
--
作者：
Kunpeng Han;Liang Tan;Changfeng Yao;Dinghua Zhang;Zheng Zhou
滚珠光整可以提高零件的使用性能，在工业生产中应用越来越广泛。为揭示Ti60合金球磨表面特性的形成机理，进行了车削结合球磨试验，并对球磨表面形貌、粗糙度、残余应力、显微硬度、显微组织等表面特性进行了详细的研究。结果表明，抛光后的表面粗糙度在63.9 ~ 110.3nm之间，表面粗糙度轮廓的高度差在600 nm以内。抛光后的应力集中系数在1.06和1.204之间变化。应力集中系数与表面粗糙度呈正相关关系。正弦衰减函数是预测残余应力沿着深度分布的有效方法。抛光后，显微硬度分布呈现出先增大后减小的趋势。此外，还观察到第二相（αs）和β相在抛光后发生了明显的偏转。核平均取向差（KAM）表明抛光后表层发生了明显的塑性变形。抛光前后的局部取向差平均值分别为0.52 μ m和0.69 μ m。几何位错密度从7.02 × 109 mm− 2增加到9.31 × 109 mm− 2。晶粒尺寸从13.1 μm减小到10.5 μm，小角度晶界比例从12.7%增加到22.5%。抛光后，晶内变形显著增加，且存在织构。研究方法和结论可为改善Ti60合金的抛光效果提供技术和数据支持。
Ball burnishing can enhance the service performance of parts and is more and more widely used in industrial production. To reveal the formation mechanism of the surface characteristics of ball burnishing of Ti60 alloy, the turning combining ball burnishing experiment was carried out, and the surface characteristics, such as surface morphology, roughness, residual stress, microhardness, and microstructure were investigated in detail. The results show that the surface roughness ranges from 63.9 nm to 110.3 nm and the height difference of the surface roughness profile is within 600 nm after burnishing. The stress concentration factors after burnishing change between 1.06 and 1.204. There is a positive correlation between the stress concentration factor and the surface roughness. The sinusoidal decay function is an effective method to predict the distribution of residual stress along the depth. After burnishing, the micro-hardness distribution shows a trend of first increasing and then decreasing. In addition, the second α phase (αs) and β phase are observed to be deflected obviously after burnishing. The kernel average misorientation (KAM) indicates that significant plastic deformation occurs in the .surface layer after burnishing. The average values of local misorientation before and after burnishing are 0.52◦and 0.69◦ respectively. The geometrically dislocation density increases from 7.02 × 109 mm− 2 to 9.31 × 109 mm− 2. The grain size is reduced from 13.1 μm to 10.5 μm, and the proportion of low-angle grain boundaries (LAGBs) has increased from 12.7% to 22.5%. Intragranular deformation increases significantly and texture exists after burnishing. The research methods and conclusions can provide technical and data support for better burnishing effect of Ti60 alloy.