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The subject under investigation was whether precipitation hardening can be employed to increase the yield strength of ultra-ductile lath martensite whilst retaining a good degree of toughness. As the precipitation of carbides in lath martensite is not possible, maximum hardness can only be achieved by means of coherent, intermetallic particles, which are as ordered as possible, and have been homogeneously precipitated. By adding small Si and Ti contents of between 1% and 3% and Mn or Ni contents of about 3% for gamma-stabilisation at high temperatures, alloys were developed which, in a matrix with a grain structure of lath martensite, attained maximum hardness of about 600 HV through a coherent intermetallic phase. With TEM the particles were identified as a G-phase with a cuboidal fcc lattice structure and a lattice constant of 1.128 nm, exactly four times that of iron.

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Authors: SCHULZ A S, Max-Planck-Institut für Eisenforschung, Düsseldorf (DE);HOUGARDY H P, Max-Planck-Institut für Eisenforschung, Düsseldorf (DE)
Bibliographic Reference: EUR 13241 DE (1991) 98 pp., FS, ECU 10
Availability: (2)
ISBN: ISBN 92-826-2422-6
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