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

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Study on Pack Aluminizing of Linear Friction Welded Joints of Dissimilar Titanium Alloys
Vol. 53, Issue 10, Pages: 10-15(2023)
Received：05 December 2022，

Revised：2023-03-15，

Published：25 October 2023
DOI： 10.7512/j.issn.1001-2303.2023.10.02
稿件说明：

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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

，远小于未渗铝时的12.478 mg/cm

。渗铝层由金属间化合物TiAl

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

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

which is much smaller than 12.478 mg/cm

without aluminization. The aluminized layer is composed of intermetallic compound TiAl

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

Keywords

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