结晶器铜板裂纹搅拌摩擦修复组织与性能  

Microstructures and mechanical properties in friction stir repaired cracks of Cu crystallizer

作　　者：单立东 甦震 潘洁 贾南 周华 孟祥晨[2] 黄永宪[2] SHAN Lidong;SU Zhen;PAN Jie;JIA Nan;ZHOU Hua;MENG Xiangchen;HUANG Yongxian(HBIS Industrial Technology Service Co.,Ltd.,Langfang 075105,Hebei,China;State Key Laboratory of Precision Welding&Joining of Materials and Structures,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]河钢工业技术服务有限公司,河北廊坊075105 [2]哈尔滨工业大学材料结构精密焊接与连接全国重点实验室,哈尔滨150001

出　　处：《焊接》2025年第4期1-7,14,共8页Welding & Joining

基　　金：国家自然科学基金资助项目(52175301,52305345,52205350)。

摘　　要：【目的】针对钢铁连铸结晶器铬锆铜板服役过程中易发生晶界疲劳裂纹、磨损等问题,亟需开发表面裂纹固相修复工艺。【方法】提出搅拌摩擦修复铜板裂纹的方法,以3 mm厚铬锆铜板为研究对象,选择截面尺寸1 mm×1 mm和2 mm×2 mm的预制裂纹为研究例,分别采用无针和带针搅拌摩擦修复工艺。【结果】搅拌摩擦修复后,1 mm×1 mm和2 mm×2 mm的表面预置裂纹完全消失且修复区无缺陷。修复后横截面硬度分布大致呈W形,无针搅拌摩擦修复热输入较小,修复区硬度可达到母材的80%以上,抗拉强度最高达233 MPa,达到母材的80%;带针搅拌摩擦修复热输入较高,修复区抗拉强度最高达223 MPa,为母材的76%。带针搅拌摩擦修复引入了搅拌针的机械搅拌作用,促进了材料流动,修复区由无针时较窄的圆弧状扩大为碗状,适合大尺寸裂纹的修复。【结论】采用无针搅拌摩擦修复可修复小尺寸裂纹,通过带针搅拌摩擦修复工艺可进一步拓宽裂纹修复尺寸,证实了搅拌摩擦固相修复技术是实现高热导率铜构件修复的有效方法。未来针对更大尺寸构件,可考虑填料式搅拌摩擦修复技术。[Objective]Aiming at the problems of grain boundary fatigue crack and wear of Cu-Cr-Zr plate during service in steel continuous casting mold fields,solid state repairing process of surficial cracks is essential.[Methods]A method of friction stir repairing(FSR)for copper crack was proposed.3 mm thick Cu-Cr-Zr plates were selected as research object.The cracks with cross section size of 1 mm×1 mm and 2 mm×2 mm were chosen as the examples,while FSR with and without a pin were used respectively.[Results]After FSR,1 mm×1 mm and 2 mm×2 mm surface preset cracks completely disappeared and no defects appeared in the repair area.After repair,hardness distribution of cross section presented roughly W shape,and heat input of pinless FSR was small.The hardness of the repair area could reach more than 80%that of base material,tensile strength reached 233 MPa,up to 80%that of base material.The heat input of FSR with a pin was high,and tensile strength of the repair area reached 223 MPa,which was 76%that of base material.FSR with a pin introduced mechanical stirring action,promoting the flow of materials.The repair area expanded from a narrow arc to a bowl without a pin,which was suitable for the repair of large size cracks.[Conclusion]FSR without a pin could repair small size crack,FSR with a pin could further broaden the repair size of cracks,which confirmed that FSR was an effective method to realize repair of high thermal conductivity copper components.Aiming at the future larger size components,additive FSR could be considered.

关 键 词：结晶器 铬锆铜 裂纹 搅拌摩擦修复 

分 类 号：TG453[金属学及工艺—焊接]