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Investigations of the Aging of High Manganese Steel

Author: YangShuai
Tutor: ZhangFuCheng
School: Yanshan University
Course: Materials Science
Keywords: High manganese steel Frog Aging Rolling contact fatigue
CLC: TG156.92
Type: Master's thesis
Year: 2010
Downloads: 203
Quote: 0
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Abstract


The purpose of this study is to look through the exploration of high - manganese steel aging treatment optimization of manufacturing processes means high manganese steel frog . High manganese steel as excellent wear-resistant materials are widely used in railway frog wear areas , at the same time as the metastable material that precipitated at room temperature , give energy may occur desolventizing decomposition , carbide precipitation , so organization and performance changes . This thesis, high manganese steel frog as the research object , the ordinary heating Aging , of deformation aging and strain induced aging , and the use of microscopy, scanning electron microscopy ( SEM ) , transmission electron microscopy (TEM) and X-ray diffraction (XRD ) and other methods to study the different changes in the microstructure and properties of high manganese steel after aging treatment , work hardening of the aging process of the high manganese steel and rolling contact fatigue performance analysis . The study showed that : deformation aging , deformation heating aging , high manganese steel is heated to 400 ℃ carbide precipitation , high manganese steel that severe embrittlement , high manganese steel frog aging treatment temperature of 350 ° C ; manganese steel the first cryogenic Reply , hardness decreased , then to the decomposition desolventizing early and late rebound hardness and fall again ; strain induced aging in the 1800MPa contact stress under high manganese steel after 40 hours at 100 ℃ the timeliness to complete desolventizing the decomposition of carbide precipitation . High manganese during aging , with the increase of the additional mechanical energy to complete the the desolventizing decomposition the desired temperature is gradually reduced . At the same time , the study found , frog hardening work hardening mechanism of high manganese steel in the compressed state for twins . High manganese steel frog tread temperature rise of about 150 ° C in the service process . Role in of 1800MPa contact stress frog high manganese steel rolling contact fatigue life of approximately 1.2 × 106 cycles , overload about 5Mt far below the actual high manganese steel frog overload . Contact surface fatigue spalling failure . The hardened layer only 1.5mm deep , maximum hardness up to 700HV .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Heat treatment > Heat treatment process > Special heat treatment > Aging treatment
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