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THE STUDY ON THE NUCLEATION OF MARTENSITIC TRANSFORMATION AND LATH WIDTH NANOMETRE IN STEEL

Author: FuPing
Tutor: GuChenQing
School: Xi'an University of Technology
Course: Materials Science
Keywords: Martensitic transformation Phase deformed nucleus Prestrain quenching Elastic wave Nano - structure Ultrasonic quenching
CLC: TG142
Type: Master's thesis
Year: 2002
Downloads: 275
Quote: 3
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Abstract


Gleeble-1500 thermal simulation machine , ultra-high-strength low-alloy steel 30SiMnCrMoV implementation of austenite prestrain quenching process by controlling the deformation , deformation temperature and loading , adjusting the elastic strain energy in the martensitic transformation in steel before reserves , the plastic deformation caused by the pre-strain elastic strain energy of the martensitic transformation . Experimental results show that : the process of pre-strain caused by plastic deformation of the martensite growth ( especially in the width direction ) constrained played an indirect role to improve the nucleation rate , the reserve elastic strain newborn martensite changes in inhibition , but the Following Health martensite there role . The reason is that the elastic energy increases newborn martensite shaped successful, newborn martensite formation will stimulate the release of the elastic energy within the austenite , the elastic energy released can promote Following Health and martensite formation , and increase the tendency of homogeneous nucleation . Based on the experimental results , the elastic martensitic transformation can release a wave trigger nucleation mechanism . The Click here mechanism martensite phase deformed nucleus process requires energy ( resilient energy) in the form of waves transmitted in the mother phase . Established based on the theory of solid state physics , the elastic strain energy is released in the form of elastic wave , the elastic wave propagation in the austenite plasmid displacement caused by the crystal lattice , strengthened martensitic deformation nuclear conditions , promote martensitic deformation nuclear physical model . The non - dynamic recrystallization temperature of the pre- strain - hardening , improving the the martensitic deformation nucleation rate can ultrafine martensite lath wafer width , bringing them closer to the nanometer level (average width of up to 120 nm) . The lath martensite nano - structure , can play nanograins fine grain strengthening, and dislocation strengthening the combined effects of , and coordination dislocation distribution, is expected to make the material strength and toughness is improved at the same time having such organizations . H66025T ultrasonic wave-generating device, the ultrasonic quenching medium carbon alloy high strength steel 35CrMnSi , found the martensite lath obvious refinement to improve the nucleation rate of martensitic deformation , confirmed that the elastic wave propagation in the austenite to promote horse 's the bulk deformation nuclear theory .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallic materials > Steel
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