| 引用本文: | 李文生,王大锋,董洪峰,褚 克.高铝青铜等离子喷焊层组织及其形成过程[J].材料科学与工艺,2013,21(6):97-103.DOI:10.11951/j.issn.1005-0299.20130617. |
| LI Wen-sheng,WANG Da-feng,DONG Hong-feng,CHU Ke.Microstructure and forming process of high-aluminum bronze plasma spray welding coating[J].Materials Science and Technology,2013,21(6):97-103.DOI:10.11951/j.issn.1005-0299.20130617. |
|
| 摘要: |
| 为研究高铝青铜等离子喷焊层组织特征及其形成机理,采用等离子喷焊工艺在45钢基体上分别制备了厚度为2和5mm的喷焊层,并对5mm厚度喷焊层沿层深方向进行分层切割,利用光学显微镜、XRD、SEM、EDS分析了不同喷焊厚度的喷焊层组织形貌、相结构、相含量及界面处元素扩散．结果表明:不同厚度的高铝青铜喷焊层均形成了α,γ2及β′相包围k相生长的组织,喷焊过程中熔池不同位置的温度场参数和成分分布不同,形成的快速冷凝固组织特征不同．钢基体Fe元素向喷焊层纵深方向的扩散随喷焊层厚度增加,2mm厚度的喷焊层中树枝状k相析出较少,偏析严重的位置出现粗大的球形组织,界面处的扩散冶金结合特征不明显;5mm厚度的喷焊层中随分隔层厚度从2、3mm增加到4mm的过程中,Fe元素扩散作用减弱,在4mm 处Fe元素含量达到最低,富Fe的k相析出减少,均匀分布的树枝状组织逐渐增多． |
| 关键词: 高铝青铜 喷焊层 微观组织 相含量 形成机理 |
| DOI：10.11951/j.issn.1005-0299.20130617 |
| 分类号: |
| 基金项目:国家国际科技合作项目(2013DFR50790);国家自然科学基金资助项目(51165021);甘肃省杰出青年基金资助项目(1111RJDA013);国家自然基金与英国皇家学会交流项目(51211130116);中国科学院西部之光项目(2012180);留学人员科技择优项目(19-0151). |
|
| Microstructure and forming process of high-aluminum bronze plasma spray welding coating |
|
LI Wen-sheng, WANG Da-feng, DONG Hong-feng, CHU Ke
|
|
(State Key Laboratory of Advanced Nonferrous Materials,Lanzhou University of Science and Technology, Lanzhou 730050, China)
|
| Abstract: |
| To investigate the microstructure feature and formation mechanism of high-aluminum bronze plasma spray welding coating, a novel high-aluminum bronze coating was fabricated on 45medium carbon steel substrate by plasma spray welding. The finish spray coating thickness was 2mm and 5mm respectively, and the 5mm coating was cut into layers along the depth direction to analyze morphologies, phase structure and phase elements distribution at different coating depth. Results show that the novel high-aluminum bronze coatings are composed of characteristic phases in which k phase disperses into the α, γ2and β′ matrix phases. While with different temperature field parameters and composition of the bath during spray welding, the sprayed coatings are provided with different solidification microstructures. Fe diffusion from the carbon steel substrate into the coatings increases with the coating thickness, few dendritic k phases and spherical bulky structure phases precipitate in the 2mm coating. The amount of Fe is lowest in the spray welding layer when the 5mm coating is deposited from 2mm, 3mm to 4mm thickness layer, and less Fe riched k phases precipitate. |
| Key words: high-aluminum bronze plasma spray coating microstructure phase content phase formation mechanism |
