Brittle Fracture of a Clapper Weldment for a Disk Valve Due to Improper Filler Metal

2019 ◽  
Keyword(s):  
Brittle Fracture ◽  
Filler Metal ◽  
Disk Valve

Interfacial Microstructure and Phase Constitution of the Cu/Al Dissimilar Metals Joint Made by Contact Reactive Brazing

2010 ◽  
Vol 97-101 ◽  
pp. 3891-3894
Author(s):  
Hong Tao Zhang ◽  
Jian Cao ◽  
Hao Lu
Keyword(s):  
Shear Strength ◽  
Brittle Fracture ◽  
Fracture Surface ◽  
Intermetallic Compounds ◽  
Filler Metal ◽  
Eutectic Structure ◽  
Interfacial Microstructure ◽  
Experimental Results ◽  
Dissimilar Metals ◽  
Phase Constitution

Joining Cu to Al has been carried out by vacuum contact reactive brazing without filler metal. Experimental results obtained showed that the eutectic structure and some Cu-Al intermetallic compounds were the main phases of the braze seam. The fracture surface of the joint presented typical brittle fracture for the existence of intermetallic compounds at the interface and the shear strength could reach 65MPa.

Microstructure and properties of W-Cu/1Cr18Ni9 steel brazed joint with different Ni-based filler metals

2018 ◽  
Vol 25 (3) ◽  
pp. 463-472 ◽  
Author(s):  
Yi Zhou ◽  
Chunzhi Xia ◽  
Jun Yang ◽  
Xiangping Xu ◽  
Jiasheng Zou
Keyword(s):  
Solid Solution ◽  
Brittle Fracture ◽  
Intermetallic Compounds ◽  
Filler Metal ◽  
Fracture Morphology ◽  
Vacuum Furnace ◽  
Cu Alloy ◽  
Intergranular Brittle Fracture ◽  
Brazed Joint ◽  
Filler Metals

AbstractW-Cu alloy and 1Cr18Ni9 steel were brazed with NiCrSiBFeTi and NiMnSiCuZr filler metals in a vacuum furnace. The main microstructure of the NiCrSiBFeTi brazing seam region was a Ni-based solid solution of W, Cu, Cr, and Fe dissolved in the Ni phase and intermetallic compounds CrB and TiCr2. The main microstructure of the NiMnSiCuZr brazing seam region was a Ni-based solid solution of Cu, Cr, and Fe dissolved in the Ni phase Fe-based solid solution of Ni, Cu, and Cr dissolved in the Fe phase and intermetallic compounds Mn5Si3, Ni3Si, and Ni7Zr2. The elements Ni, Si, and Ti contained in the NiCrSiBFeTi filler metal and the elements Ni, Mn, and Si contained in the NiMnSiCuZr filler metal were more easily diffused into the interface of W-Cu alloy compared with that of 1Cr18Ni9 steel. The shear strength values of NiCrSiBFeTi joint and NiMnSiCuZr joint were approximately 285 and 249 MPa, respectively, and fracture of the two joints occurred at the interface near the W-Cu alloy side. The fracture morphology of the former was identified as cleavage brittle fracture, and the latter was identified as intergranular brittle fracture.

Selective Corrosion of brazed joint between BNi-2 filler metal and stainless steel 316

1996 ◽  
Vol 54 ◽  
pp. 218-219
Author(s):  
H. S. Kim ◽  
R. U. Lee
Keyword(s):  
Stainless Steel ◽  
Filler Metal ◽  
Surface Preparation ◽  
Optical Microscope ◽  
Heating Element ◽  
Incomplete Fusion ◽  
Atmospheric Conditions ◽  
Leak Test ◽  
High Temperature Side ◽  
Inconel 600

A heating element/electrical conduit assembly used in the Orbiter Maneuvering System failed a leak test during a routine refurbishment inspection. The conduit, approximately 100 mm in length and 12 mm in diameter, was fabricated from two tubes and braze-joined with a sleeve. The tube on the high temperature side (heating element side) and the sleeve were made of Inconel 600 and the other tube was stainless steel (SS) 316. For the filler metal, a Ni-Cr-B brazing alloy per AWS BNi-2, was used. A Helium leak test spotted the leak located at the joint between the sleeve and SS 316 tubing. This joint was dissected, mounted in a plastic mold, polished, and examined with an optical microscope. Debonding of the brazed surfaces was noticed, more pronounced toward the sleeve end which was exposed to uncontrolled atmospheric conditions intermittently. Initially, lack of wetting was suspected, presumably caused by inadequate surface preparation or incomplete fusion of the filler metal. However, this postulation was later discarded based upon the following observations: (1) The angle of wetting between the fillet and tube was small, an indication of adequate wetting, (2) the fillet did not exhibit a globular microstructure which would be an indication of insufficient melting of the filler metal, and (3) debonding was intermittent toward the midsection of the sleeve.

Brittle Fracture Characteristics of Multiple Notches in Parallel and Parallel-staggered Arrangement

1975 ◽  
Vol 15 (1) ◽  
pp. 11-18
Author(s):  
Hiroshi MAENAKA ◽  
Shigeru KITAMURA ◽  
Kin-ichi NAGAI ◽  
Kazuo IKEDA ◽  
Katsuya KAJIMOTO ◽  
...  
Keyword(s):  
Brittle Fracture ◽  
Fracture Characteristics ◽  
Staggered Arrangement

NICROBRAZ LC

Alloy Digest ◽  
1994 ◽  
Vol 43 (4) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Filler Metal ◽  
Low Carbon

Abstract NICROBRAZ LC is a specially formulated low-carbon brazing filler metal for applications where corrosion is the major service problem. This datasheet provides information on composition and physical properties. It also includes information on corrosion resistance as well as joining. Filing Code: Ni-451. Producer or source: Wall Colmonoy Corporation.

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