YANG Yanqing MA Shiliang QIN Xiongpu KANG Mokuang Northwestern Polytechnical University
,
Xi'an
,
China YANG Yanqing
,
Graduate student
,
Dept.of Materials Science and Engineering
,
Northwestern Polytechnical University
,
Xi'an 710072
,
China
金属学报(英文版)
Two types of lath structures and kinked ε martensite were observed in the high manganese non-magnetic steel.Both the short non-continuous lath formed by quenching and the long thin straight lath induced by plastic deformation are composed of ε martensite and fcc twin. The transformation mechanism was discussed.The crystallographic analysis indicates that the e martensite at both sides of the fcc twin boundary is of kinked morphology owing to the orientation of their matrices differing from each other.The kinked region is hcp twin.
关键词:
εmartensite
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J.X.Zhang1)
,
K. Tamarat2) and B. Dubois2) 1) Schoolof Material Science & Engineering
,
Hebei University of Technology
,
Tianjin 300130
,
China2) ISMCM LISSMA
,
St.Ouen 93407
,
France
金属学报(英文版)
Thethermal induced γ εmartensitic transformation in a Fe 31 6 Mn 6 5 Si ( wt% ) alloy wasstudied by meansof X ray diffraction throughtwothermalcyclesin the83 480 Ktem perature range.Itisshownthatduringcoolingtheγ→εtransformationterminatesnotat TγNbutatalowertemperatureandtheγphaseexhibitsstrongstabilityevencoolingto83 K;like wise,εmartensiteis noticeably stable even heating up to 480 K. Atthe temperature about 275 K, an anomalousdecreaseintheintensityofthe(200)γreflections wasobserved on heat ing, whereasthe(101)εreflectionsshow ageneralvariationinintensity.Itisconsideredthat theabnormalphenomenonis probably related tothe magnetictransition of the γphase fromantiferromagnetism to paramagnetism .
关键词:
Fe Mn
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