采用氢化脱氢(hydrogenation-dehydrogenation,HDH)工艺制备不规则形状Nb521合金粉末,结合流化技术将氢化脱氢粉末进行改性处理,改善粉末球形度及流动性,所制流化Nb521合金粉末基本满足3D打印的工艺要求。通过X射线衍射(X-ray diffracti...采用氢化脱氢(hydrogenation-dehydrogenation,HDH)工艺制备不规则形状Nb521合金粉末,结合流化技术将氢化脱氢粉末进行改性处理,改善粉末球形度及流动性,所制流化Nb521合金粉末基本满足3D打印的工艺要求。通过X射线衍射(X-ray diffraction,XRD)分析、扫描电子显微镜(scanning electron microscope,SEM)观察、粒度分析、化学分析等手段,对粉末形貌、粒度分布、间隙元素含量、球形率以及流动性等特性进行表征。结果表明,经流化处理后,不规则形状的氢化脱氢Nb521合金粉末粒度分布变窄,球形率和流动性均得到显著提高,杂质元素含量得到有效控制,3D打印过程中的铺粉效果良好。展开更多
The dissimilar brazing of Nb521 niobium alloy to GH99 superalloy was achieved successfully using Ti–35Ni brazing filler under vacuum.The effects of brazing temperature and holding time were systematically analyzed on...The dissimilar brazing of Nb521 niobium alloy to GH99 superalloy was achieved successfully using Ti–35Ni brazing filler under vacuum.The effects of brazing temperature and holding time were systematically analyzed on the interfacial microstructure evolution and mechanical properties of joints.The joints brazed at 1120℃ for 10 min exhibited a typical interfacial structure composed of Nb521/β-(Nb,Ti)+TiNi/TiNi+Ti_(2)Ni/TiNi+TiNi_(3)/Cr-rich TiNi/Ti-rich(Ni,Cr)_(ss)/(Ni,Cr)_(ss)/GH99.The findings indicated that as the brazing temperature or holding time increased,the presence of brittle Ti_(2)Ni compounds decreased while the formation of TiNi_(3) gradually increased and tended to coarsen.The shear strength of joints exhibited variations corresponding to changes in interfacial brittle compound,and reached the highest value of 121 MPa at 1120℃ for 10 min.In the context of shear testing,all joints displayed clear brittle fracture patterns,with fractures predominantly occurring at the brittle compounds,namely,Ti_(2)Ni and TiNi_(3) phases.展开更多
文摘采用氢化脱氢(hydrogenation-dehydrogenation,HDH)工艺制备不规则形状Nb521合金粉末,结合流化技术将氢化脱氢粉末进行改性处理,改善粉末球形度及流动性,所制流化Nb521合金粉末基本满足3D打印的工艺要求。通过X射线衍射(X-ray diffraction,XRD)分析、扫描电子显微镜(scanning electron microscope,SEM)观察、粒度分析、化学分析等手段,对粉末形貌、粒度分布、间隙元素含量、球形率以及流动性等特性进行表征。结果表明,经流化处理后,不规则形状的氢化脱氢Nb521合金粉末粒度分布变窄,球形率和流动性均得到显著提高,杂质元素含量得到有效控制,3D打印过程中的铺粉效果良好。
基金the National Natural Science Foundation of China(Grant No.52175307)Shandong Natural Science Foundation(Grant No.ZR2023JQ021).
文摘The dissimilar brazing of Nb521 niobium alloy to GH99 superalloy was achieved successfully using Ti–35Ni brazing filler under vacuum.The effects of brazing temperature and holding time were systematically analyzed on the interfacial microstructure evolution and mechanical properties of joints.The joints brazed at 1120℃ for 10 min exhibited a typical interfacial structure composed of Nb521/β-(Nb,Ti)+TiNi/TiNi+Ti_(2)Ni/TiNi+TiNi_(3)/Cr-rich TiNi/Ti-rich(Ni,Cr)_(ss)/(Ni,Cr)_(ss)/GH99.The findings indicated that as the brazing temperature or holding time increased,the presence of brittle Ti_(2)Ni compounds decreased while the formation of TiNi_(3) gradually increased and tended to coarsen.The shear strength of joints exhibited variations corresponding to changes in interfacial brittle compound,and reached the highest value of 121 MPa at 1120℃ for 10 min.In the context of shear testing,all joints displayed clear brittle fracture patterns,with fractures predominantly occurring at the brittle compounds,namely,Ti_(2)Ni and TiNi_(3) phases.
