| This work is a study of the work-hardening and abrasion resistance of aluminum-modified Hadfield manganese steel. The nominal ranges of compositions investigated were 13.5% Mn, 0.75% Si, 1.00 to 1.75% C, and 0.0 to 4.0% Al. Work-hardening properties were studied in the temperature range of -25 to 450(DEGREES)C, and wear resistances were determined by low-stress and high-stress abrasion testing.; Aluminum additions decreased carbon activity and diffusivity in austenite in Hadfield steel and increased the stacking fault energy of the austenite. Increasing carbon in solution in austenite in Hadfield steel expanded the temperature range over which dynamic strain aging occurred. As a result of these effects, simultaneous aluminum additions and increased carbon content increased the work-hardening rate and high-stress abrasion resistance of Hadfield manganese steel, but there was an optimum aluminum content beyond which both declined. Maximum work-hardening rate was exhibited by an alloy containing nominally 1.75% C, 13.5% Mn, and 1.3% Al. Improved high-stress abrasion resistance was also found in an alloy containing nominally 1.00% C, 13.5% Mn, and 4.00% Al. |
