1. N. J. Petch:J. Iron Steel Inst., 1953, vol. 174, p. 25.
2. R. A. Grange:Trans. ASM, 1966, vol. 59, p. 26.
3. R. A. Grange and E. R. Shackelford: Method of Producing Ultrafine Grained Steel, U.S. Pat. 3,178,324, 1965; assigned to U.S. Steel Corp.
4. R. A. Grange: Method of Hardening Hypereutectoid Steels, U.S. Pat. 3,337,376, 1967; assigned to U.S. Steel Corp.
5. G. R. Speich and A. Szirmae:Trans. TMS-AIME, 1969, vol. 245, p. 1063.