王绿原,马佳云,王克鸿,付扬帆,李忠盛,张隆平.Mg-Gd-Y-Zr合金TIG电弧熔覆层微观组织演变及力学性能研究[J].表面技术,2020,49(10):188-197.
WANG Lyu-yuan,MA Jia-yun,WANG Ke-hong,FU Yang-fan,LI Zhong-sheng,ZHANG Long-ping.Microstructure Evolution and Mechanical Properties of TIG Cladded Mg-Gd-Y-Zr Alloy[J].Surface Technology,2020,49(10):188-197 |
| Mg-Gd-Y-Zr合金TIG电弧熔覆层微观组织演变及力学性能研究 |
| Microstructure Evolution and Mechanical Properties of TIG Cladded Mg-Gd-Y-Zr Alloy |
| 投稿时间：2020-07-20 修订日期：2020-10-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2020.10.021 |
| 中文关键词: AZ91D镁合金 Mg-Gd-Y-Zr合金 TIG熔覆 组织演化 力学性能 |
| 英文关键词:AZ91D magnesium alloy Mg-Gd-Y-Zr alloy TIG cladding microstructure evolution mechanical properties |
| 基金项目:国防科工局智能制造专项（JCKY2018606B003）；中国博士后科学基金（2020M671405） |
|
|
| Author | Institution |
| WANG Lyu-yuan | 1.School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China |
| MA Jia-yun | 1.School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China |
| WANG Ke-hong | 1.School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China |
| FU Yang-fan | 2.Southwest Technology and Engineering Research Institute, Chongqing 400039, China |
| LI Zhong-sheng | 2.Southwest Technology and Engineering Research Institute, Chongqing 400039, China |
| ZHANG Long-ping | 2.Southwest Technology and Engineering Research Institute, Chongqing 400039, China |
|
| 摘要点击次数: |
| 全文下载次数: |
| 中文摘要: |
| 目的 在AZ91D镁合金表面熔覆Mg-Gd-Y-Zr合金，分析熔覆层微观组织演变规律及其对熔覆层力学性能的影响。方法 采用直流脉冲钨极氩弧焊（DC PTIG welding），在不同平均电流下，将Mg-Gd-Y-Zr合金焊丝送入AZ91D镁合金熔池，制备熔覆层。采用金相显微镜、扫描电子显微镜、能谱仪及X射线衍射仪，分析不同平均电流条件下的熔覆层微观组织。基于显微维氏硬度仪与往复式滑动摩擦磨损设备，表征熔覆层硬度及摩擦学性能。结果 熔覆层微观组织主要由α-Mg、Mg24(Gd,Y)5及Al2(Gd,Y)相组成。熔覆层呈现明显分层特征，主要是由晶界Mg24(Gd,Y)5相分布差异造成。平均电流增大，熔覆层中心晶粒尺寸先保持不变，而后快速增大，Al2(Gd,Y)相由细小弥散颗粒变为团聚状分布，晶界Mg24(Gd,Y)5相则由连续网状演变为不连续岛状，直至变为细小颗粒状。熔覆层硬度随平均电流增加，呈现略微上升，随后快速下降的趋势，其最高硬度达90.8HV。摩擦磨损测试过程中，平均电流为110 A所得熔覆层失重速率小于AZ91D基材。结论 采用DC PTIG在AZ91D基体表面成功制备了耐磨性能优于基体的含Gd、Y稀土元素的熔覆层，稀释率决定熔覆层Al2(Gd,Y)相形貌及分布规律。 |
| 英文摘要: |
| The work aims to deposit Mg-Gd-Y-Zr alloy on surface of AZ91D magnesium alloy and analyze the micros-tructure evolution and mechanical properties of cladding layer. DC PTIG welding was used to convey the welding wires of Mg-Gd-Y-Zr alloy to the AZ91D magnesium alloy molten pool at different average current to prepare cladding layer. The microstructure of cladding layers was analyzed by metallographic microscope, scanning electron microscope, energy dispersive spectroscopy and X ray diffraction pattern. The hardness and tribological properties were characterized by Vikers microhardness and reciprocating wear tester. The main phases of cladding layer were composed of α-Mg, Mg24(Gd,Y)5, and Al2(Gd,Y). The difference in distribution and morphology of Mg24(Gd,Y)5 lead to the layered morphology. With the increase of average current, the central grain size of cladding layer kept unchanged at first and then increased rapidly, and the Al2(Gd,Y) phase changed from fine dispersed particles to agglomerated distribution and the morphology of Mg24(Gd,Y)5 located at the grain boundary transformed from a continuous network to disconnected and fragmentized islands and then spheroidal particles. The hardness of cladding layer increased slightly and then decreased sharply with the increase of average current, and the maximum hardness reached 90.8HV. The weight loss rate of cladding layer during wear test at the current of 110 A was lower than that of substrate. The cladding layer containing Gd and Y rare earth elements with better wear resistance than AZ91D substrate can be prepared successfully on the surface of AZ91D magnesium alloy by DC-PTIG. The morphology and distribution of the Al2(Gd,Y) can be determined by the dilution ratio of cladding layers. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|
渝公网安备 50010702501715号