Effect of elevated temperature on the strengthening of Fe−9.84% Cr alloy

Abstract

Cold forging is widely used in machine building because it provides a wide range of products with a high precision of geometry, a good quality of surface, and improved strength properties. However, many alloyed steels are not subjected to a pressure treatment in a cold state, because they possess a high resistance to deformation and require a high deformation force and a high pressure on the tools. In order to diminish the resistance to deformation of high-alloy steels and other high-strength alloys the producer can resort to semihot forging. Semihot forging preserves some advantages of cold forging, i.e., the precision and high quality of the surface, and has some advantages of hot deformation. For example, it has been shown by many researchers that deformation of alloys at 100–700°C reduces the deformation force by a factor of 1.5–2. This is accompanied by strain toughening, though the strength properties of the metals are lower than in the case of straining in a cold state. The present paper is devoted to the properties of an iron-chromium alloy tested for compressive strength at different temperatures.