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马氏体转变(二十)

Martensitic Transformation(20)
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摘要 7.3马氏体的韧性研究材料韧性,易于设想的是位错的塞积.在奥氏体晶体内一滑移面上Frank-Read位错源(简称F-R源)受到切应力т0,当т0>0,则位错源启动.形成的位错环先后在晶界处发生塞积,塞积位错数n[131]为n=π(тo-тp)L n=κπ(т0-тp)L、Gb (7-12)式中:k为系数,对螺位错k=1,对刃位错k=1-v(v为泊松比);тp为位错移动的摩擦力(称Peierls-Nabarro力),前已有指出;G为切变模量;b为布氏矢量;L为发生位错塞积的距离.一般认为F-R位错源在晶粒中心时,L=D/2,D为奥氏体晶粒直径.
出处 《热处理技术与装备》 2014年第6期66-75,共10页 Heat Treatment Technology and Equipment
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