5NORMAN A M. Method of hardening manganese steel: US, 2703297 [P]. 1955-03-01.
6SHEWMON P G, ZACKAY V F. Response of metals to high velocity deformation[M]. New York: Wiley Interscience Publishers, Inc., 1961.
7DU P. Surface hardening of metals: UK, 910076 [P]. 1962-11-07.
8SO M, NAGAHIRO H. High manganese cast steel: JP, 61157657 [P]. 1986-07-17.
9KATS R Z, PUTRYA N, KRASIKOV K I, et al. Method of explosive hardening a cast portion of acute angle frogs of railroad switches: UK, 2172234 [P]. 1986-09-17.