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Increasing Ti-6Al-4V brazed joint strength equal to the base metal by Ti and Zr amorphous filler alloys

机译:通过Ti和Zr非晶态填充合金提高与母材相等的Ti-6Al-4V钎焊接头强度

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摘要

Microstructural features developed along with mechanical properties in furnace brazing of Ti-6Al-4V alloy using STEMET 1228 (Ti-26.8Zr-13Ni-13.9Cu, wt.%) and STEMET 1406 (Zr-9.7Ti-12.4Ni-11.2Cu, wt.%) amorphous filler alloys. Brazing temperatures employed were 900-950 °C for the titanium-based filler and 900-990 °C for the zirconium-based filler alloys, respectively. The brazing time durations were 600, 1200 and 1800 s. The brazed joints were evaluated by ultrasonic test, and their microstructures and phase constitutions analyzed by metallography, scanning electron microscopy and X-ray diffraction analysis. Since microstructural evolution across the furnace brazed joints primarily depends on their alloying elements such as Cu, Ni and Zr along the joint. Accordingly, existence of Zr 2Cu, Ti 2Cu and (Ti,Zr) 2Ni intermetallic compounds was identified in the brazed joints. The chemical composition of segregation region in the center of brazed joints was identical to virgin filler alloy content which greatly deteriorated the shear strength of the joints. Adequate brazing time (1800 s) and/or temperature (950 °C for Ti-based and 990 °C for Zr-based) resulted in an acicular Widmanstätten microstructure throughout the entire joint section due to eutectoid reaction. This microstructure increased the shear strength of the brazed joints up to the Ti-6Al-4V tensile strength level. Consequently, Ti-6Al-4V can be furnace brazed by Ti and Zr base foils produced excellent joint strengths. © 2012 Elsevier Inc. All rights reserved.
机译:使用STEMET 1228(Ti-26.8Zr-13Ni-13.9Cu,wt。%)和STEMET 1406(Zr-9.7Ti-12.4Ni-11.2Cu, wt。%)无定形填充合金。钛基填料的钎焊温度为900-950°C,锆基填料合金的钎焊温度分别为900-990°C。钎焊时间分别为600、1200和1800 s。钎焊接头通过超声测试进行评估,并通过金相,扫描电子显微镜和X射线衍射分析对其显微组织和相组成进行分析。由于在整个钎焊接头处的显微组织演变主要取决于沿接头的铜,镍和锆等合金元素。因此,在钎焊接头中发现了Zr 2Cu,Ti 2Cu和(Ti,Zr)2Ni金属间化合物的存在。钎焊接头中心偏析区域的化学成分与未加工的填充合金含量相同,这大大降低了接头的剪切强度。适当的钎焊时间(1800 s)和/或温度(Ti基为950°C,Zr基为990°C)会由于共析反应而在整个接头区域形成针状Widmanstätten微观结构。这种微结构将钎焊接头的剪切强度提高到Ti-6Al-4V拉伸强度水平。因此,Ti-6Al-4V可以用Ti和Zr基箔进行熔炉钎焊,从而产生出色的结合强度。 ©2012 Elsevier Inc.保留所有权利。

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