| 摘要 |
PCT No. PCT/FI91/00279 Sec. 371 Date Mar. 9, 1993 Sec. 102(e) Date Mar. 9, 1993 PCT Filed Sep. 12, 1991 PCT Pub. No. WO92/04478 PCT Pub. Date Mar. 19, 1992.A wear resisting steel of the Hadfield-type and method for its production are provided. This iron base alloy contains in its basic composition following alloying carbon, manganese, silicon and optionally chromium, and/or molybdenum, and/or tungsten. The matrix of the steel is formed by the ductile austenite. Carbides appear on the grain boundaries in the form of roundish, hard, separate precipitates. In the grain boundary zone and inside the grains are hard, needle-shaped nitride and carbonitrides to improve the wear resistance especially against abrasive wear. In accordance with the method the steel is solution heat treated at a temperature range below 1100 DEG C. (e.g., 950 DEG to below 1100 DEG C.) so that carbide, nitride and carbonitride precipitates formed in the microstructure following casting are partially but not completely dissolved. |
