STUDY IN FO RMATION OF SUB GRAINS AND MICROCRACKS IN WEIDED METAIS UNDER FATIGUE LOAD

金属学报(英文版), 1999, 12(4): 713-718.

STUDY IN FO RMATION OF SUB GRAINS AND MICROCRACKS IN WEIDED METAIS UNDER FATIGUE LOAD

S.Z.Dong , J.B.Li , X.H.Zhang and J.Zhang Shenyang University , Shenyang 110044 , China

Keywords： fatigueload , null , null , null

With TEM( Transmission Electron Microscope) ,ithasobserved and analyzedthatforming processof Sub grainsand position offormingfatigue microcracksarein Welded metalsofthe16 Mnsteelundertensile tensilestress. Theresultsindicatedthattheforming processof Sub grainsfrom dislocationtanglecellstotheSub grains. Thepositionofformingfatigue micro crackisattheoxidativeinterfaceand granular noncrgstallines and Sub boundaries. Thece mentiteineutectoidsafterfracture may beproduced microcracks.

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STUDY IN FO RMATION OF SUB GRAINS AND MICROCRACKS IN WEIDED METAIS UNDER FATIGUE LOAD

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