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Syn op sis T he mor/lhology qf the bainite in some low carbon low 0110)' high strength sleels has been investigated by means oj dilalomel l) ' and both olltica l and electron microscollies. The results indica Ie lila t Ihe bainite can be devided into three distinct Iylles k)' the lIlor/lilolog)' of Ihe cemenlite /Irecillitalion. The /Jainile f is Jormed al Ihe lem/lCra tures abol'e SUO C alld is the carbide-Jree ha initic ferrile. The bainite f f is formed in Ihe intermediale lem/lerature range or b), coolin/!, at intermediale cooling ra te. A lthongh some amoun t oj cementile Ilarticles areJonned wilhin Ihe gra ins, the bainite !I consisted mainly oj Jerrile laths with cementile la)'ers between them , being a i)'/Iical oj u/I/)er bainite. The bainite 111 is Jormed at the temliCratures close 10 the Jl1s or during cooling at as Jasl as the u/'/ler crilical cooling ra te, Ihe morl)hology oj cementile Jormation is similar in a/l/Jeaf{/Ilce to Ihe high carbon lower hainite. !-Iowever, these bainites had the lalh-like Jerrite lIlor/lllOlog_y exh ibiting Ihe same (III). [ II O}. habit. This is di.f!erentJrom the high carbon lower bainite wilh plale-likeJerrile. There-Jore, it seems reasonable 10 classify Ihe bainites observed in low carbon low alloy high strength sleels as the u/)/)er bainile. * Prese nt ed at th e 80th IS I.I M ee tin g, O ctober, 1970. in A magasa ki. l\[a nll scr ip t rece ived D ece mbe r 2, 1970. ** Ce ntra l R ('s('ar c h L abo ra tor ies, S ll m itomo l\[eta l Jn ci ll st ri es, Ltd., Nish in agas lI-hondor i, AlIl agasaki 660.

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