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- W2896202015 abstract "Present study attempts to establish comparison of ductility, hardness and impact strength of AISI 4340 steel between conventional treatments and special treatments(dual phase) where conventional treatments serve as preheat treatments. Dual phase treatment consists of partial austenitising and austempering at upper and lowerbainitic temperatures (300 and 400°C respectively). Salt bath of NaNO2 and NaNO3 mixture is used for isothermal holding in the bainitic temperature ranges. Dual phasesteel contains different amount of high strength bainite phases within ferrite matrix depending upon the austenitisation temperature. On partially austenitising by heating in the intercritical temperature ranges, salt bath quenching followed by isothermal holding at 300°C gives lower bainite while upper bainite is forming by isothermalholding at 400°C. The mechanical characterization is executed as per ASTM standards and the results are analysed. It is observed that the mechanical property ofnormalized bainite is better than that of annealed bainite. Ductility of normalized is less compared to that of other conditions. Impact resistance of both bainitic phasesobtained by different initial phases is higher as compared to bainite free structure. Normalized shows excellent hardness while ductility is maximum in annealedcompared to bainitic phases" @default.
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- W2896202015 date "2018-08-01" @default.
- W2896202015 modified "2023-09-25" @default.
- W2896202015 title "Effect of preheat treatment structure On mechanical characterization of aisi 4340 ferrite bainite dual phase steel" @default.
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