Survey of Microstructure after Annealing and Normalizing for C45 Steel with Small Diameter

Abstract

In the mechanical engineering field, C45 steel with a small diameter is commonly used to manufacture load-bearing machine parts such as nuts, bolts, gear shafts, piston pins, slider bars, etc. The microstructure will help partially support the machining capabilities assessment to achieve high productivity. This article proposes to investigate the microstructure of a C45 steel sample with dimensions of 12  12 mm with different temperatures cooled in the same furnace and still air. The set of images of the microstructure of this steel sample after annealing and normalizing is the basis for choosing the heat treatment process to match the cutting regime.