富铜相对Fe-3%Si-Cu合金再结晶行为的影响  

Influence of Cu-rich precipitates on recrystallization behavior of Fe-3%Si-Cu alloy

作　　者：张慧敏[1] 张程远 吴忠旺[1] 金自力[1] 任慧平[1] 王朝毅 Zhang Huimin;Zhang Chengyuan;Wu Zhongwang;Jin Zili;Ren Huiping;Wang Chaoyi(School of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou Inner Mongolia 014010,China;Inner Mongolia Baotou Steel Pipe Co.,Ltd.,Baotou Inner Mongolia 014010,China)

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010 [2]内蒙古包钢钢管有限公司,内蒙古包头014010

出　　处：《金属热处理》2022年第5期76-81,共6页Heat Treatment of Metals

基　　金：国家自然科学基金(51761033);内蒙古自治区关键技术攻关计划(2020GG0150)。

摘　　要：以2块热轧Fe-3%Si-Cu合金板为研究对象,分别过时效处理和固溶处理后多道次冷轧再进行500~800℃再结晶退火处理,分析了合金再结晶退火后的显微组织及不同再结晶退火工艺下合金的硬度变化,从而研究了冷轧Fe-3%Si-Cu合金的再结晶行为。结果表明,热轧试样经650℃过时效处理后有椭球形或棒状的面心立方ε-Cu相析出,棒状富铜相的尺寸较大,其长轴≥100 nm。不同工艺热处理的试样经冷轧后均表现出随退火温度的升高,完全再结晶时间缩短,且由于富铜相的析出,经固溶处理后的试样退火后其再结晶时间明显比过时效处理后试样的短。当再结晶退火温度为500℃时,冷轧前进行了固溶处理的试样出现了回复引起的软化不足以抵消析出造成的硬化的现象,在10;s时硬度曲线上出现明显的时效硬化峰;在600℃以上退火时,则表现出再结晶占优势的退火特征,硬度曲线没有明显的时效硬化峰。Taking 2 pieces of hot rolled Fe-3%Si-Cu alloy plates as the research object, over-aged and solution-treated respectively and multi-pass cold rolled, and then recrystallization annealed at 500-800 ℃, the recrystallization behaviors of the cold rolled Fe-3%Si-Cu alloy plates were researched by studying the microstructure after annealing and the hardness change with different annealing processes. The results show that when the hot-rolled specimens are over-aged at 650 ℃, the fcc ε-Cu phase is precipitated with the morphology of ellipsoidal or rod-shaped, and the size of the rod-shaped copper-rich phase is large, with its long axis being greater than or equal to 100 nm. Both the specimens treated by different heat treatments before cold rolling show that the complete recrystallization time is shortened with the increase of annealing temperature, while due to the precipitation of copper-rich phase, the fully recrystallization time of the specimen solution-treated is significantly shorter than that of the over-aged. When the annealing temperature is 500 ℃, because the softening caused by the recovery is not enough to offset the hardening caused by precipitation, the hardness curve of the solution-treated specimen shows an obvious aging hardening peak when the annealing time is 10~4 s. When the annealing temperature is above 600 ℃, the solution-treated specimen shows the recrystallization dominated annealing characteristics, and without aging hardening peak on the hardness curve.

关 键 词：Fe-3%Si-Cu合金 富铜相 再结晶 硬度 

分 类 号：TG142.1[一般工业技术—材料科学与工程]