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《Journal of Shanghai Jiaotong University》 1984-04
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A Study of a Dual Phase Low Carbon Manganese-Niobium Steel

Xu Zuoren Yu Jinxing  
A study has been made of the effects of morphology and volume fraction of mar-tensite obtained by various intercritical heat treatments on the substructure of theindividual phases,mechanical behavior and formability of a dual phase low carbonmanganese-niobium steel.The experimental results illustrate that,with various kinds ofheat treatments,changes occur in the mechanism of nucleation and growth of austeniteduring phase transformation by heating,resulting in remarkable differences in the mor-phologies and mechanical behavior of the dual phase steel.The dislocation density andstrength of the ferrite phase are enhanced as the volume fraction of martensite increas-es.The carbon content and strength of martensite phase decrease as the volumefraction of martensite increases.The mechanical behavior of the dual phase steel ismainly determined by the mixture ratio of phases and their morphologies.The micro-structure and mechanical properties of ferrite and martensite in the dual phase steel aresignificantly different from those of steel with individual phases.The law of mixture de-duced from Mileiko's models can well be used for calculating the strength of fiber-streng-thened composite materials but will not satisfy strength calculations of dual phasesteels.A New mixture rule is proposed which either agrees well with the experimentalresults or is suited for expressing the strength-volume fraction of martensite relation-ship.The results of cold formability tests demonstrate that the dual phase low carbonmanganese-noibium steel with 15~20% martensite exhibits excellent stretchability andhas about 10% smaller springback than the as rolled steels at the same level of tensilestrength,indicating a significant“shapeholding”advantage.
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