冷却速率对纯铁固态相变行为的影响  

Effect of Cooling Rate on Solid Phase Transformation Behavior of Pure Iron

作　　者：马壮壮 李志明 张鉴磊 陈刚[2] 宋长江[1] MA Zhuangzhuang;LI Zhiming;ZHANG Jianlei;CHEN Gang;SONG Changjiang(School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China;Ningbo Branch of Chinese Academy of Ordnance Science,Ningbo Zhejiang 315103,China)

机构地区：[1]上海大学材料科学与工程学院,上海200444 [2]中国兵器科学研究院宁波分院,浙江宁波315103

出　　处：《上海金属》2024年第4期65-70,共6页Shanghai Metals

基　　金：宁波市重大科技攻关暨“揭榜挂帅”项目(2022Z056);国家自然科学基金(52271034,51974184);国家磁约束核聚变能发展研究专项(2018YFE0306102)。

摘　　要：采用高精度热膨胀相变仪研究了工业纯铁在较宽的冷却速率范围内(冷速0.1~150℃/s及极限冷速560℃/s)的固态相变行为。结果表明:随着冷速从0.1℃/s增加至50℃/s,纯铁γ→α相变开始温度缓慢降低,当冷速从50℃/s增加至150℃/s时,γ→α相变开始温度快速下降;冷却速率增加还使纯铁γ→α相变所需时间缩短,当冷速增加到150℃/s时,γ→α相变时间缩短至0.2 s;当冷速从0.1℃/s增加到100℃/s时,铁素体生长模式从三维转变为二维生长。Solid phase transformation behavior of commercially pure iron over a wide range of cooling rates(cooling rates of 0.1 to 150℃/s and limiting cooling rates of 560℃/s)was studied by using a high-precision thermal expansion phase transition instrument.The results showed that(a)as the cooling rate increased from 0.1 to 50℃/s,the start temperature of γ toαphase transformation in pure iron decreased slowly,when the cooling rate increased from 50 to 150℃/s,the start temperature of γ toαphase transformation decreased rapidly;(b)the increase in cooling rate also shortened the time required for γ toαphase transformation,and when the cooling rate was increased to 150℃/s,the γ toαphase transformation time was shortened to 0.2 s;(c)when the cooling rate increased from 0.1 to 100℃/s,the growth process of ferrite changed from three-dimensional to two-dimensional growth mode.

关 键 词：亚快速凝固 非平衡相变 固态相变 

分 类 号：TG141[一般工业技术—材料科学与工程]