Zr基大块金属玻璃与304L不锈钢脉冲激光焊接接头微观组织特性  

Microstructure Characteristics in the Pulsed Laser Welding Joint of Zr-based BMG and 304L Stainless Steel

作　　者：陈会子 黄健康[1,2] 刘世恩 于晓全[2] 樊丁[2] CHEN Huizi;HUANG Jiankang;LIU Shi’en;YU Xiaoquan;FAN Ding(School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China;State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学材料科学与工程学院,兰州730050 [2]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,兰州730050

出　　处：《材料导报》2020年第16期16100-16103,共4页Materials Reports

基　　金：国家自然科学基金(51865029)。

摘　　要：采用脉冲激光的方法实现了Zr44Ti11 Ni10Cu10Be25(原子分数,%)大块金属玻璃与304L不锈钢板的焊接。用场发射扫描电子显微镜、能谱仪、X射线衍射仪对焊接接头不同区域的显微结构和化学成分进行了表征。由于冷却速度不同,形成了三个不同的结晶区。接头由部分结晶区(热影响区、焊缝区和304L不锈钢/焊缝区界面)和非晶区(Zr基BMG母材)组成。热影响区出现花瓣状和小颗粒的结晶,X射线衍射图谱中衍射峰强度很小,焊缝区出现一些十字雪花状的结晶,衍射峰对应Zr 2Cu和Zr 2Fe相,而在304L不锈钢/焊缝区界面处XRD图谱中出现大量尖锐的晶体峰。通过计算得到热影响区、焊缝区和304L不锈钢/焊缝区界面三个不同的结晶区的结晶分数分别为1.4%、10.0%、27.4%。焊缝区形成的晶态组织维氏硬度最大。大块金属玻璃与焊缝区之间形成扩散层,表明焊接过程中Zr通过扩散层向焊缝区迁移。Using pulsed laser welding method,the connection between Zr 44 Ti 11 Ni 10 Cu 10 Be 25(at%)bulk metallic glass and 304L stainless steel plate was realized.The microstructures and chemical compositions of different regions of weld joint were characterized by field emission scanning electron microscope,energy dispersive spectrometer and X-ray diffraction.Three different crystallization zones were formed due to different coo-ling rates.The weld joint consists of partial crystallization zone(heat affected zone,weld zone and 304L stainless steel/weld zone interface)and amorphous zone(Zr-based bulk metallic glass base metal).Petal-like and small-particle crystallization occurs in heat affected zone.The intensity of diffraction peaks in X-ray diffraction pattern is very small.Some cross-snowflake crystallization appear in weld zone.The diffraction peaks correspond to Zr 2Cu and Zr 2Fe phases.A large number of sharp crystal peaks appear in XRD pattern at 304L stainless steel/weld zone interface.The results show that the crystallization fractions of heat affected zone,weld zone and 304L stainless steel/weld zone interface are 1.4%,10.0%and 27.4%,respectively.The Vickers hardness of the crystalline microstructure formed in the weld zone is the highest.The diffusion layer formed between BMG and weld zone indicates that Zr migrates to weld zone through diffusion layer during welding.

关 键 词：大块金属玻璃 焊接接头 微观组织 结晶分数 

分 类 号：TG442[金属学及工艺—焊接]