WELDING OF LOW CARBON-DUAL PHASE STEEL WITH DIFFERENT COOLING RATE AND ANNEALING TIME

 للكاتب :

Mustafa Ahmed Rijab Al-Najar

Mechanical Department – Technical Institute–baquba- Iraq

ABSTRACT

The result of this research work showed that the increase of the cooling rate will increase the

amount of martensite that will reduce the weldability of the dual phase steel . the low

percentage carbon enables water to be as a suitable quenching medium for production of the

dual phase steel of better weldability than the quenching medium of a salt solution

The results also showed that the increased annealing time causes growth of the austenite grain

size without affecting its amount . annealing for a period of more than 10 minutes produces a

structure of polygouized ferrite-martensite , while annealing for 10 minutes or less the

structure will be polygonized ferrite – pearlaite with small amount of martensite . bearing in

mind that the weldability depends on the amount of the martensite phase its distribution

within matrix .

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