Abstract Since the 1980s, cold work tool steel into the era of rapid development, Rapid increase in the annual rate of 15 percent, China's mold steel share is low, market development space is very large。 In recent years, China's imports from Japan, the United States and other countries die steel more and more, resulting in increased costs。 Quality die steel demand continues to expand, and the lack of domestic production technology makes no representation quality steel, so the study of the production process has become an important task。 Cr8 cold work die steel with high strength and good wear resistance, and low prices, production process is simple, and therefore is widely recognized in the country, increasing demand, but its stability is difficult to control the quality of the production process It will cause great waste, study its production process and improve its overall performance, has great significance。
This paper focuses on the impact Cr8 cold work die steel silicon content on the unevenness of eutectic carbides and hardness。 Eutectic carbides unevenness series overall performance of the steel has a great impact, and the uneven distribution of eutectic great time, the ductility decreased significantly carbide particle size, life greatly reduced。 Subject to Tiangong International Company's Cr8 cold work tool steel for the study, to imitate in the laboratory daily production by electric arc furnace, LF furnace, VD furnace to give silicon content of different experimental samples and experimental samples were heat-treated, in the quenching tank is heated to 1050 degrees quenching, and tempering at 480 degrees Celsius。 Then each sample was microscopically observed, to understand their organizational structure, and the use of image processing software to obtain their eutectic carbide of the series, investigate the effect of silicon content on the microstructure。 It was also the hardness of the samples were tested to study the effects of silicon content on hardness。