High-chromium cast iron heat treatment process

Abstract

The invention relates to a high-chromium cast iron heat treatment process. The process includes steps: heating high-chromium cast iron in a heating furnace for 1.5-2, and after the heating temperaturereaches 1010-1050DEG C, keeping the temperature for 1.5-2h to realize austenization; discharging the high-chromium cast iron, and quenching; reheating the quenched high-chromium cast iron in the furnace for 1.5-2h, and after the heating temperature reaches 450-460DEG C, keeping the temperature for 1.5-2h; discharging the high-chromium cast iron, and performing air cooling to the room temperature.By reasonable optimization of the quenching temperature and the temper temperature, the quenched high-chromium cast iron structure is appropriate in content of martensite, retained austenite and carbides, and Rockwell hardness, impact toughness and comprehensive mechanical properties are greatly improved as compared with those of a cast sample.

Description

technical field [0001] The invention relates to the field of metal heat treatment, in particular to a high-chromium cast iron heat treatment process. Background technique [0002] As we all know, two objects that are in contact with each other or moving relative to each other will have friction on their surfaces. In general, friction is often accompanied by wear, and when the wear reaches a certain level, it will inevitably lead to the failure of various machines or parts. a great safety hazard. my country is also a big manufacturing country. In our country, departments such as metallurgy, mining, building materials, electric power, and coal use a lot of mining machinery, engineering machinery, and various crushing and grinding equipment. These equipment generally operate in harsh industrial environments. Under the circumstances, some parts will consume a large amount of metal every year due to the wear and tear of sand, ore, soil and other materials and grinding bodies. Th...

AI Technical Summary

Problems solved by technology

The metal matrix structure of high-chromium cast iron in the as-cast state is mainly austenite, pearlite, etc. The overall macroscopic hardness is not high, and the final performance is that the wear resistance of the casting is poor. There are also large differences in size and quantity, and there is a large splitting effect on the metal matrix, resulting in poor toughness of castings

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