Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 20, 2019 - November 22, 2019
In the mechanical industries, forging process with dies is one of the deforming methods for steels and non-ferritic materials. In order to use forging dies for long lifetime and with less wear and seizure, a sulfornitriding process was sometimes applied to the dies made of die steels. This surface treatment consists of sulfidation to form sulfide layer and nitridation to make nitride diffusion zone. A sulfide layer is able to reduce the friction coefficient and improve seizure resistance. A nitrided diffusion zone increases hardness, abrasion resistance and lifetime. The sulfide layer is mainly composed of iron sulfide (FeS). It is very necessary to investigate and clarify its tribological functions of FeS. Details of the physical and mechanical properties of FeS, for instance, hardness and fracture toughness are also very important. However, the physical properties of FeS have not been investigated well, especially in high temperature conditions. In this study, high-temperature deformation behavior of FeS sintered bulks in compressive experiments are conducted at room and several high temperatures．
