YANG Dazhi ZHU Min Dalian Institute of Technology
,
Dalian
,
Liaoning
,
China. YANG Dazhi
,
Professor
,
Dept.of Mater.Sci.and Eng.
,
Dalian Institute of Technology
,
Dalian
,
Liaoning
,
China
金属学报(英文版)
The substructural development of martensite plates at different stage of the transformation for an Fe-21Ni-4Mn alloy has been investigated by using transmission electron microscope. Twinning was found in small thin platelets at the initial stage.Fine twins extend to the whole platelet.The dislocations and twins were found in the thick platelets at a later stage.Bending of the twins was also observed frequently at this stage.Finally,several platelets coalesce with each other to form a macroscopic(252)_f martensite“plate”.The original habit plane of the individual platelet was measured to be close to(121)_f.
关键词:
Fe-Ni-Mn alloy
,
null
,
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ZHOU Lubin ZHANG Jie KANG Mokuang Northwest Polytechnic University
,
Xi'an
,
China ZHOU Lubin
,
Associate Professor
,
Dept.of Mater.Sci.and Eng.
,
Northwest Polytechnic University
,
Xi'an
,
China
金属学报(英文版)
The strain fatigue,impact fatigue and rotation beam fatigue behaviour of granular bainitic structure has been studied.The results show that the strain fatigue properties and the impact fatigue properties of granular bainite are superior to that of tempered martensite under the condition that the ultimate tensile strength is equal.The impact.fatigue life increases with in- creasing amount of granular bainite,because the M-A islands might retard the propagation of fatigue crack.The rotation beam fatigue properties of granular hainite are similar to that of tempered martensite.The relationship between.fatigue limit S_f,yield strength σ_y and frac- ture strength S_k may be expressed as S_f=4.651+0.1411(σ_y+S_k)
关键词:
granular bainite
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null
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null
