Fe-36Ni因瓦合金的热塑性  

Hot ductility of Fe-36Ni invar alloy

作　　者：何煜天 王福明[1,2] 李长荣[3] 杨占兵[1,2] 张婧[1,2] 李永亮[1,2] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]北京科技大学钢铁冶金新技术国家重点实验室,北京100083 [3]北京科技大学材料科学与工程学院.北京100083

出　　处：《工程科学学报》2016年第11期1576-1583,共8页Chinese Journal of Engineering

基　　金：国家自然科学基金资助项目(51374018)

摘　　要：采用Gleeble-3800热模拟试验机研究Fe-36Ni合金在900～1200℃的热塑性行为，并用FactSage软件、扫描电镜及透射电镜等研究该合金热塑性的影响因素及作用机理．结果表明：合金中主要形成A12O3＋Ti303＋MnS复合夹杂，夹杂物颗粒尺寸集中分布在0．5μm以下．合金热塑性在900～1050℃受晶界滑移及动态再结晶共同影响．晶界上分布的纳米级别（〈200nm）夹杂物有效钉扎晶界，抑制动态再结晶发生的同时减小晶界结合力．微米级别（〉200nm）夹杂物则促进显微裂纹在晶界滑移过程中的形成和扩展，损害合金热塑性．当温度高于1050℃时，较高的变形温度使再结晶驱动力大于钉扎作用力，合金发生动态再结晶，有效提高热塑性．在1100～1200℃区间内，枝晶间裂纹的形成、晶界滑移的加剧及动态再结晶晶粒尺寸增大都降低合金热塑性．The hot ductility behaviors of Fe-36Ni alloy in the temperature range of 900- 1200 ℃ were investigated by using a Gleeble-3800 thermal simulator. The influence factors and mechanism of action on the hot ductility were systematically analyzed by FaetSage software, scanning electron microscopy and transmission electron microscopy. The results show that inclusions in the investi- gated alloy are mainly A12 O3 ＋ Ti3O5 ＋ MnS, and most inclusion sizes are below 0. 5 μm. The hot ductility of the alloy in the tempera- ture range of 900-1050 ℃ is influenced by grain boundary sliding and dynamic recrystallization. Nano-scale size （ 〈 200 nm） inclu- sions at grain boundaries effectively inhibit the occurrence of dynamic recrystallization as a result of the pinning effect and decrease the grain boundary cohesion. Moreover, micro-scale size （ 〉 200 nm） inclusions at grain boundaries promote the nucleation and propaga- tion of cracks during grain boundary sliding and decrease the hot ductility of the alloy. Increasing the temperature makes the driving force for dynamic reerystallization larger than the pinning effect, and thus increases the hot ductility significantly by the occurrence of dynamic recrystallization when the temperature exceeds 1050℃. In the temperature range of 1100-1200℃, the formation of interden- dritic cracks, the coarsening of recrystallized grains and the enhanced grain boundary sliding deteriorate the hot ductility of the alloy.

关 键 词：铁镍合金 热塑性 夹杂物 动态再结晶 晶界滑移 

分 类 号：TG142.76[一般工业技术—材料科学与工程]