Infrared brazing of Ti-6Al-4V and 17-4 PH stainless steel with a nickel barrier layer
- PDF / 690,300 Bytes
- 11 Pages / 576 x 720 pts Page_size
- 54 Downloads / 160 Views
issimilar joining of Ti-6Al-4V and 17-4 PH stainless steel (17-4 PH SS) is potentially applied in the manufacture of golf club heads. The combination of a less expensive 17-4 PH SS body and an expensive Ti-6Al-4V striking plate makes an attractive product for many manufacturers. However, it is difficult to form a reliable metallurgical bond between Ti-6Al-4V and 17-4 PH SS due to the high reactivity of titanium. Titanium is readily reacted with several other elements and forms brittle intermetallics in the brazed joint.[1,2,3] Accordingly, adhesive bonding or mechanical fastening is currently applied in joining the Ti alloy and 17-4 PH SS. Brazing is often considered as one of the best choices in dissimilar bonding. It has been reported that the titanium alloy is successfully brazed with many silver-based braze alloys.[3–6] 72Ag-28Cu (wt pct) is a eutectic silver-based braze alloy with a melting point of 780 °C. Based on the AWS specification for braze alloys, it is found consistent with the BAg-8 braze alloy.[3] The silver-based braze alloy is suitable in brazing steels, stainless steels, titanium alloys, and refractory metals.[1,3] Accordingly, it has been chosen as the filler metal in brazing Ti-6Al-4V and 17-4 PH SS. Infrared brazing makes use of infrared energy generated by heating a tungsten filament in a quartz tube as the heating source, and it features an extraordinarily high heating rate of about 3000 °C/min.[4,7] The infrared rays can easily transmit through the quartz tube, as quartz is transparent for infrared light. By means of an appropriate optical focusing system, local heating of the bonding surfaces can be easily R.K. SHIUE, Associate Professor, and S.K. WU, Professor, are with the Department of Materials Science and Engineering, National Taiwan University, Taipei 106, R.O.C. Taiwan. Contact e-mail: [email protected] C.H. CHAN, Engineer, formerly with the Institute of Mechanical Engineering, National Taiwan University, is now with the Chung-Shan Institute of Science and Technology, Tao-Yuan, R.O.C. Taiwan. C.S. HUANG, Sergeant, formerly with the Institute of Mechanical Engineering, National Taiwan University, is now with the Chinese (Taiwan) Army, Tao-Yuan, R.O.C. Taiwan. Manuscript submitted September 15, 2005. METALLURGICAL AND MATERIALS TRANSACTIONS A
achieved. Accordingly, infrared brazing is characterized by both its fast thermal history and high-energy efficiency, making it very promising for brazing. The interfacial reaction among the molten braze and substrates during infrared brazing may be greatly decreased due to its rapid thermal history. Several infrared-brazed joints have been reported in the literature.[7,8,9] Alternatively, the interfacial reaction among the molten braze and both the substrates during brazing can also be alleviated or avoided by using a barrier layer coated on the substrate.[10–14] A barrier layer can isolate or abate the interfacial reaction between the molten braze and the substrate during brazing. Therefore, it is expected that the bonding strength can be further improv
Data Loading...
