工程科学学报，第38卷，第11期：1576-1583,2016年11月 Chinese Journal of Engineering,Vol.38,No.11:1576-1583,November 2016 D0l:10.13374/j.issn2095-9389.2016.11.010:http://journals.ustb.edu.cn Fe一36Ni因瓦合金的热塑性 何煜天12》，王福明2》四，李长荣》，杨占兵12)，张婧2》，李永亮12》 1)北京科技大学治金与生态工程学院，北京1000832)北京科技大学钢铁治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 ☒通信作者，E-mail:wangfuming@metall.usth.eu.cn 摘要采用Gleeble3800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Al,O3+Ti,O,+MS复合夹杂，夹杂物颗 粒尺寸集中分布在0.5m以下.合金热塑性在900~1050℃受晶界滑移及动态再结品共同影响.品界上分布的纳米级别 (<200m)夹杂物有效钉扎品界，抑制动态再结晶发生的同时减小晶界结合力.微米级别(>200m)夹杂物则促进显微裂 纹在晶品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. 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 Hot ductility of Fe-36Ni invar alloy HE Yu-tian'),WANG Fu-ming,LI Chang-rong,YANG Zhan-bing,ZHANG Jing,LI Yong-liang) 1)School of Metallurgical and Ecological Engineering,University of Seience and Technology Beijing,Beijing 100083,China 2)State Key Laboratory of Advaneed Metallurgy,University of Science and Technology Beijing,Beijing 100083,China 3)School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China Corresponding author,E-mail:wangfuming@metall.ustb.edu.cn ABSTRACT The hot ductility behaviors of Fe-36Ni alloy in the temperature range of 900-1200 C were investigated by using a Gleeble-3800 thermal simulator.The influence factors and mechanism of action on the hot ductility were systematically analyzed by FactSage software,scanning electron microscopy and transmission electron microscopy.The results show that inclusions in the investi- gated alloy are mainly AlO+TiO+MnS,and most inclusion sizes are below 0.5 um.The hot ductility of the alloy in the tempera- ture range of 900-1050 C 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 recrystallization larger than the pinning effect,and thus increases the hot ductility significantly by the occurrence of dynamic recrystallization when the temperature exceeds 1050C.In the temperature range of 1100-1200 C,the formation of interden- dritic cracks,the coarsening of recrystallized grains and the enhanced grain boundary sliding deteriorate the hot ductility of the alloy. KEY WORDS iron nickel alloys:hot ductility:inclusions:dynamic recrystallization:grain boundary sliding 收稿日期：2016-03-18 基金项目：国家自然科学基金资助项目(51374018)工程科学学报，第 38 卷，第 11 期: 1576--1583，2016 年 11 月 Chinese Journal of Engineering，Vol． 38，No． 11: 1576--1583，November 2016 DOI: 10． 13374 /j． issn2095--9389． 2016． 11． 010; http: / /journals． ustb． edu． cn Fe--36Ni 因瓦合金的热塑性 何煜天1，2) ，王福明1，2) ，李长荣3) ，杨占兵1，2) ，张 婧1，2) ，李永亮1，2) 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  通信作者，E-mail: wangfuming@ metall． ustb． edu． cn 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 Al2O3 + Ti3O5 + MnS 复合夹杂，夹杂物颗 粒尺寸集中分布在 0. 5 μm 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 ( ＜ 200 nm) 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( ＞ 200 nm) 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． 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 收稿日期: 2016--03--18 基金项目: 国家自然科学基金资助项目( 51374018) Hot ductility of Fe--36Ni invar alloy HE Yu-tian1，2) ，WANG Fu-ming1，2)  ，LI Chang-rong3) ，YANG Zhan-bing1，2) ，ZHANG Jing1，2) ，LI Yong-liang1，2) 1) School of Metallurgical and Ecological Engineering，University of Science and Technology Beijing，Beijing 100083，China 2) State Key Laboratory of Advanced Metallurgy，University of Science and Technology Beijing，Beijing 100083，China 3) School of Materials Science and Engineering，University of Science and Technology Beijing，Beijing 100083，China  Corresponding author，E-mail: wangfuming@ metall． ustb． edu． cn ABSTＲACT 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 FactSage software，scanning electron microscopy and transmission electron microscopy． The results show that inclusions in the investi￾gated alloy are mainly Al2O3 + 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 recrystallization 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． KEY WOＲDS iron nickel alloys; hot ductility; inclusions; dynamic recrystallization; grain boundary sliding