Study on Pack Aluminizing of Linear Friction Welded Joints of Dissimilar Titanium Alloys

LIU Zhaoze; CHENG Donghai

doi:10.7512/j.issn.1001-2303.2023.10.02

Important Issuse | Views : 0 下载量: 8 CSCD: 0

PDF
Export
Share
Collection
Album

Study on Pack Aluminizing of Linear Friction Welded Joints of Dissimilar Titanium Alloys
Vol. 53, Issue 10, Pages: 10-15(2023)
DOI： 10.7512/j.issn.1001-2303.2023.10.02

扫描看全文

刘钊泽，程东海.异种钛合金线性摩擦焊接头包埋渗铝研究［J］.电焊机，2023，53（10）：10-15.

LIU Zhaoze, CHENG Donghai.Study on Pack Aluminizing of Linear Friction Welded Joints of Dissimilar Titanium Alloys[J].Electric Welding Machine, 2023, 53(10): 10-15.
刘钊泽，程东海.异种钛合金线性摩擦焊接头包埋渗铝研究［J］.电焊机，2023，53（10）：10-15. DOI： 10.7512/j.issn.1001-2303.2023.10.02.

LIU Zhaoze, CHENG Donghai.Study on Pack Aluminizing of Linear Friction Welded Joints of Dissimilar Titanium Alloys[J].Electric Welding Machine, 2023, 53(10): 10-15. DOI： 10.7512/j.issn.1001-2303.2023.10.02.

摘要

采用包埋渗铝的方法对异种钛合金线性摩擦焊接头制备渗铝层，以提高接头的腐蚀性能。分析焊接接头渗铝层的形貌及组成，研究渗铝层对热腐蚀性能的作用和影响，并优化了渗铝工艺。研究结果表明：包埋渗铝有利于提高接头的热腐蚀性能，渗铝后腐蚀增重降低，腐蚀稳定性提高，其原因是渗铝前后腐蚀反应发生了改变.在高温熔盐环境下，接头直接与腐蚀介质发生反应，因钛合金中铝含量较少，无法在表面形成致密的氧化膜，而渗铝接头表面与氧反应生成的致密氧化铝膜阻隔了熔盐和氧气向接头内部侵蚀；渗铝接头热腐蚀100 h后的腐蚀增重为0.926 mg/cm,2,，远小于未渗铝时的12.478 mg/cm,2,。渗铝层由金属间化合物TiAl,3,组成，渗铝层的厚度不一致，TC17侧较TA15侧厚，在焊缝近域缓慢过渡。渗铝层的厚度随着保温温度升高呈先升后降趋势，随着保温时间延长呈递增趋势，综合考虑可得到最佳渗铝温度范围在850~950 ℃之间，而最佳渗铝时间范围在3~5 h之间。

Abstract

Pack cementation method was used to form aluminized layer on linear friction welded joints of dissimilar titanium alloys, in order to improve the corrosion resistance of joints. The morphology and composition of the aluminized layer of welded joint were analyzed, and the effect and influence of aluminized layer on hot corrosion performance was studied, and the aluminizing process was optimized.,Results,2,indicate that pack aluminizing is conducive to improving the hot corrosion performance of the joint, and the corrosion weight decreases and the corrosion stability improves after aluminization. The reason is that the corrosion reaction changes before and after aluminizing. Under the environment of high temperature molten salt, the joint directly reacts with the corrosion medium, because the aluminum content of titanium alloy is less, the dense oxide film cannot be formed on the surface. The aluminized joint surface reacts with oxygen to form a dense alumina film, which prevents molten salt and oxygen from eroding into the joint. After hot corrosion for 100 h, the corrosion weight gain of aluminized joint is 0.926 mg/cm,2, which is much smaller than 12.478 mg/cm,2, without aluminization. The aluminized layer is composed of intermetallic compound TiAl,3, and the thickness of the aluminized layer is inconsistent. The TC17 side is thicker than the TA15 side, and the transition is slow in the near field of the weld. The thickness of aluminized layer increases first and then decreases with the increase of holding temperature, and increases gradually with the extension of holding time. After comprehensive consideration, the optimal aluminizing temperature range is 850~950 ℃, and the optimal aluminizing time range is 3~5 h.

关键词

渗铝层包埋渗铝线性摩擦焊异种钛合金接头热腐蚀

Keywords

aluminized layerpack aluminizinglinear friction weldingdissimilar titanium alloy jointshot corrosion

references

Anthony R M， Paul A C， Clement B， et al. A literature review of Ti-6Al-4V linear friction welding［J］. Progress in Materials Science， 2018， 92： 225-257.

Bhamji I， Preuss M， Threadgill P L， et al. Solid state joining of metals by linear friction welding： a literature review［J］. Materials Science and Technology， 2011， 27（1）： 2-12.

蔡建明，李娟，田丰，等. 先进航空发动机用高温钛合金双性能整体叶盘的制造［J］. 航空制造技术， 2019， 62（19）： 34-40.

CAI J M， LI J， TIAN F， et al. Manufacturing of High Temperature Titanium Alloy Dual-Property Blisk Used for Advanced Aero-Engine［J］. Aeronautical Manufacturing Technology， 2019， 62（19）： 34-40.

Ciszak C， Popa I， Brossard J M， et al. NaCl-induced high-temperature corrosion of β21S Ti alloy［J］. Oxidation of Metals， 2017， 87（5）： 729-740.

Zhang Z G， Peng Y P， Mao Y L， et al. Effect of hot-dip aluminizing on the oxidation resistance of Ti-6Al-4V alloy at high temperatures［J］. Corrosion Science， 2012， 55： 187-193.

Wang S P， Zhou L， Li C J， et al. Morphology of composite coatings formed on Mo1 substrate using hot-dip aluminising and micro-arc oxidation techniques［J］. Applied Surface Science， 2020， 508： 144761.

Yener T. Chromium-Aluminide Coatings via Pack Cementation Method on Inconel 718 Alloy and Fe-Cr-Ni SuperAlloy［J］. Sakarya University Journal of Science， 2019， 23（5）： 817-823.

Yener T. Low temperature aluminising of Fe-Cr-Ni super alloy by pack cementation［J］. Vacuum， 2019， 162： 114-120.

Mozgovoy S， Alik L， Hardell J， et al. Material transfer during high temperature sliding of Al-Si coated 22MnB5 steel against PVD coatings with and without aluminium［J］. Wear， 2019， 426： 401-411.

Ye C， Jia L， Xu G， et al. Microstructure and initial corrosion behavior of double-layer Zn-Al-Mg coatings produced by PVD［J］. Surface and Coatings Technology， 2019， 366： 214-226.

Ishigaki T， Tatsuoka S， Sato K， et al. Influence of the Al content on mechanical properties of CVD aluminum titanium nitride coatings［J］. International Journal of Refractory Metals and Hard Materials， 2018， 71： 227-231.

王永东，常萌阳，王金宇，等. 钛及钛合金表面涂层制备方法研究现状［J］. 电焊机， 2022， 52（06）： 46-54+77.

WANG Y D， CHANG M Y， WANG J Y， et al. Research Status of Preparation Methods for Titanium and Titanium Alloy Surface Coatings［J］. Electric Welding Machine， 2022， 52（06）： 46-54+77.

唐紫苑，张淑婷，杜开平，等. 包埋渗技术在镍基高温合金中的应用［J］. 材料导报，2021，35（Z1）：389-394.

TANG Z W， ZHANG S T， DU K P， et al. Application of Pack Cementation Technology in Nickel-based Superalloys［J］.Materials Reports，2021，35（S1）：389-394.

Mengis L， Oskay C， Donchev A， et al. Critical assessment of the cyclic oxidation resistance of the aluminized Ti-48Al-2Cr-2Nb TiAl alloy at 700℃ and its impact on mechanical properties［J］. Surface and Coatings Technology， 2021， 406： 126646.

Chaia N， Cossu C， Ferreira L M， et al. Protective aluminide coating by pack cementation for Beta 21-S titanium alloy［J］. Corrosion Science， 2019， 160： 108165.

戚正风. 固态金属中的扩散与相变［M］. 北京：机械工业出版社，1998.

Alert me when the article has been cited

提交

Research on microstructure and mechanical properties of linear friction welding joint of U20Mn rail steel