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《Journal of Shanghai Jiaotong University》 1983-04
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The Effects of Intercritical Heat Treatment on the Transformation of Reverted Austenite and Cryogenic Mechanical Properties of Fe-6Mn-0.5Mo-0.1Al Steel

Xu Zuoren Hu Yaorong  
The transformation process of α'martensite into reverted austenite has beenstudied with the metallographic and TEM technique.When the heating temperature isbelow As,the globular reverted austenite is first formed on the prior austenite grainboundaries,martensite packet boundaries and lath interphase with diffusional mecha-nism.After attaining a diameter of 0.2—0.8μm,the austenite globules grow no more.The reason why there exists an ultimate size at which globules stop grow can beexplained by a simple diffusional model.When the heating temperature is nearlybelow As,the austenite globules formed along the lath interphases increase signifi-cantly and finally link up with each other into a laminal structure.However,whenheated above As temperature,the reverted austenite initiates with shear mechanismand acquires a lamillar morphology.An alternate heat treatment in the γ region and(α+γ)region yields the refinement of the martensite packet size.Different austenitecontents have been obtained by tempering for 4 hours at various temperatures belowAs.After being tempered below 550℃ and above 670℃,no austenite can be observ-ed by x-ray diffration.The smaller the martensite packet size,the larger the volumefraction of the retained austenite.Cryogenic tensile,series impact and (da/dN)at-50℃ have been measured.It hasbeen found out that the structural features favouring the improvement of the cryo-genic strength and toughness include the full recovery of the α-matrix,the stabilityof the retained austenite and the refinement of the grain size(or effective grain size)as well.The first two factors are more significant.The influence of the retainedaustenite on σ_(0.2),σ_5 and Cv is more pronounced in coarse grained specimens.Grainrefinement can increase the propagation resistance of fatigue cracks.The thermal treatment which consists of a two-step thermal cycling followed bya 580℃ final intercritical temper for four hours(2β580)may be used to achievean optimum combination of strength and toughness in Fe-6Mn-0.5Mo-0.1Al steel.
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