具螺牙结构的零件及其制造方法;COMPONENT HAVING THREAD STRUCTURE AND METHOD OF FABRICATING THE SAME

摘要

一种具螺牙结构的零件，包括金属本体，其呈线状而具有第一端以及和第一端相对的第二端。在第一端处形成有螺牙结构，且金属本体在第一端处由外而内依序包括奈米晶表层、过渡层以及芯层，其中奈米晶表层的晶粒尺寸介于10nm到100nm之间，芯层的晶粒尺寸介于10μm到40μm之间，过渡层的晶粒尺寸介于奈米晶表层的晶粒尺寸和芯层的晶粒尺寸之间，且在第一端处，金属本体的晶粒尺寸由外而内逐渐变大，呈梯度分布。; the grain size of the core layer is between 10 μm and 40 μm; the grain size of the transition layer is less than that of the core layer and greater than that of the nano-crystalline surface layer. At the first end, the metal main body has a grain size distribution that increases gradually from the surface to the interior thereof, i.e., exhibits a gradient behavior.