Fe-Cr-B antifriction alloy containing aluminum and preparation method thereof

Abstract

The invention discloses a Fe-Cr-B antifriction alloy containing aluminum and a preparation method thereof, belonging to the technical field of high-temperature antifriction materials. The alloy comprises the following chemical compositions in percentage by mass: 0.35-0.50 percent of C; 12.0-14.0 percent of Cr; 1.5-1.8 percent of B; 3.0-3.5 percent of Al; 1.2-1.5 percent of Si; 0.08-0.15 percent of La, and 0.08-0.15 percent of Ce, 0.10-0.15 percent of Ti; 0.32-0.38 percent of Na; 0.12-0.20 percent of Zn; 0.16-0.20 percent of Mg not more than 0.50 percent of Mn, not more than 0.035 percent of S, not more than 0.035 percent of P and the balance of Fe, wherein the sum of La and Ce is not less than 0.22 percent and not more than 0.28 percent. After smelting, casting, machining, quenching and tempering treatments, the alloy has high rigidity, good high-temperature antifriction performance, relatively low production cost and relatively high economic benefit in popularization and application.

Description

technical field [0001] The invention relates to an Fe-Cr-B wear-resistant alloy and a preparation method thereof, in particular to an aluminum-containing Fe-Cr-B wear-resistant alloy and a preparation method thereof, belonging to the technical field of high-temperature wear-resistant materials. Background technique [0002] In many industrial sectors such as metallurgy, electric power, machinery, building materials, national defense, military industry, and aerospace, there are high-temperature wear problems of metal materials. Wear failure; during hot forging, high temperature wear of the mold is also one of the main failure forms. There are also some mechanical parts that often fail due to high temperature wear, such as automobile engine exhaust valves and valve seats, piston collars and cylinder liners, etc. [0003] High-temperature wear is a harsh and complex working condition, which has strict requirements on material properties. It must not only have good heat resista...

AI Technical Summary

Problems solved by technology

However, the high-temperature oxidation resistance of Fe-Cr-B materials is poor, and the hardness of the matrix decreases significantly at high temperatures, resulting in the metal matrix being unable to provide good support for the hard phase (carbide, boride) under high-temperature wear, and the matrix is ​​easy to choose Wear, the hard phase is prone to brittle fracture and peeling under the action of abrasives, and its excellent anti-wear performance cannot be fully exerted