Microstructure and characteristics of high dimension brazed joints of cermets and steel

• Autorzy: Nowacki J. , Kawiak M.
• Języki publikacji: EN

Abstrakty

EN

Purpose: In the article a state of the question concerning stresses in brazing joints of different physical and mechanical properties was appraised as well as possibility of their decrease due to use of different techniques from technological experiments to numerical methods. Evaluation of microstructure and mechanical properties of large dimensional vacuum brazed joints of WC – Co and Ferro Titanit Nicro 128 sinters and precipitation hardened stainless steel of 14 –5 PH (X5CrNiMoCuNb14-5) using copper and silver – copper as the brazing filler metal. Design/methodology/approach: Microscopic examinations with the use of scanning electron microscope (SEM) were performed to establish microstructure and diffusion influences on creation of intermetallic phases in the joint. Shear strength Rt and tensile strength Rm of the joints have been defined. It have been state, that the basic factors decreasing quality of the joint, which can occur during vacuum brazing of the WC - Co ISO K05 sinter – Cu or Ag - Cu brazing filler metal – 14 -5 PH steel joints are diffusive processes leading to exchange of the cermets and brazing filler metal elements and creation of intermetallic in the joint. It can have an unfavourable influence on ductility and quality of the joint. Findings: Results of numerical calculations of two-dimensional models of brazed joints for different sizes of surfaces brazed at a constant width of solder gap are presented. Particular attention was paid to stresses occurring in joints of large brazing surfaces. Results of the investigate proved that joints microstructure and mechanical properties depend on filler and parent materials, diffusion process during brazing, leading to exchange of the cermets components and filler metal as well as joint geometry (mainly gap thickness). Practical implications: The results have been applied in surfaces are used in large dimension spinning nozzles of a die for polyethylene granulation, in that considerable strength, ductility and friction resistance of them are required. Originality/value: The effect of joint geometry (soldering clearance size, inter-plate distance, plate geometric parameters) on its microstructure and the status of stresses and deformations as well as on the process of plate cracking has been determined.

Słowa kluczowe

EN

brazing; cermets; mechanical properties; microstructure; stresses

PL

lutowanie; cermetal; właściwości mechaniczne; mikrostruktura; naprężenia

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2009
• Tom: Vol. 37, nr 2
• Strony: 448--457
• Opis fizyczny: Bibliogr. 14 poz., rys., tabl.

Twórcy

autor

Nowacki J.

autor

Kawiak M.

• Institute of Engineering Materials, West Pomeranian University of Technology in Szczecin, Al. Piastów 17, 70-310 Szczecin, Poland,

Bibliografia

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