Study on the Brazing Technology and Mechanical Properties Using bmp7 Filler Metal
The 1Cr18Ni9Ti stainless steel was brazed in the argon shield and впр7 as the filler metal. The spreadability and clearance fillability of впр7 on 1Cr18Ni9Ti stainless steel was evaluated at different temperatures and the optimum brazing temperature was clearly demonstrated as 1170~1190°C. Scanning electron microscope (SEM) study combined with energy dispersive spectrometer (EDS) showed the presence of many undissolved elements and voids in the joints while the brazing clearance is 0.15mm, which directly caused a low joint shearing strength. Almost no undissolved brittle compounds were observed while the brazing clearance stands in a range of 0.01mm~0.10mm. Therefore, a Ni-based solid solution with good performance was obtained in the joint. Those brazing parameters matching with the holding time 8~10min could bring the joint a typical performance which fully satisfies Russian standard. These conclusions had been proved by joint stress-rupture and low cycle fatigue tests.
Pengcheng Wang, Liqun Ai, Yungang Li, Xiaoming Sang and Jinglong Bu
X. Z. Hua et al., "Study on the Brazing Technology and Mechanical Properties Using bmp7 Filler Metal", Advanced Materials Research, Vols. 295-297, pp. 1879-1884, 2011