WŁAŚCIWOŚCI MECHANICZNE I STRUKTURALNE ZŁĄCZY STALI NIERDZEWNEJ I TYTANU LUTOWANYCH SPOIWAMI SREBRNYMI ZAWIERAJĄCYMI CYNĘJoining of titanium and its alloys with stainless steel by means of welding methods and obtaining joints characterised by good operation properties constitutes today a significant problem in relation to research and technology. Apart from specialised welding technologies, brazing is one of the basic methods applied for joining these having diversified physical and chemical properties material combinations. Brazing is especially recommendable in the production of systems and heat exchangers for chemical industry as well as subassemblies of nuclear reactors and aircraft engines and accessories. Similarly as in case of welded joints of stainless steel and titanium, the mechanical properties of brazed joints of the aforesaid materials are connected with the occurrence of hard and brittle intermetallic phases appearing in the form of continuous layers on braze boundaries.This work reports testing of strength properties and investigation of structures of vacuum-brazed joints of stainless chromium-nickel steel (X6CrNiTi18-10) and titanium (Grade 2) at 820÷900• C for 5÷20 min by means of silver brazing filler metals with tin grade B-Ag68CuSn-730/755 (Ag68Cu28Sn4) i B-Ag65CuSnNi-740/767 (Ag65Cu28Sn5Ni2). These filler metals assure better wettability of stainless steel hard to wettable in vacuum brazing.The structural tests were conducted taking advantage of optical microscopy; by means of a scanning electron microscope (SEM) and energy-dispersion spectrometer (EDS).The test results allowed to specify the most convenient brazing parameters of the tested material system from the mechanical properties point of view and to determine of qualitative and geometrical changes in joint structures depending on temperature and brazing times.
This study presents results of vacuum diffusion brazing of Grade 2 titanium with 6082 (AlMg1Si0.6Cu0.3) aluminium alloy using B-Ag72Cu-780 (Ag72Cu28) grade silver brazing metal as an interlayer. Brazed joints underwent shear tests, light-microscopybased metallographic examinations and structural examinations using scanning electron microscopy (SEM) and X-ray energy dispersive spectrometry (EDS). The highest quality and shear strength of 20 MPa was characteristic of joints brazed at 530°C with a 30-minute hold. The structural examinations revealed that in diffusion zone near the boundary with titanium the braze contained solid solutions based on hard and brittle Ti-Al type intermetallic phases determining the strength of the joints.
Lutowanie dyfuzyjne tytanu z użyciem przekładek z miedzi i niklu diffusion brazing of titanium with copper and nickel as a filler metals Dr hab. inż. Zbigniew Mirski, prof. PWr-politechnika Wrocławska, dr inż. Maciej Różański, dr inż. Andrzej Winiowski-Instytut Spawalnictwa w Gliwicach. Streszczenie W artykule omówiono problematykę lutowności tytanu. Opisano zasadę procesu i mechanizmy powstawania połączeń wykonanych poprzez lutowanie dyfuzyjne. Przestawiono wyniki badań metalograficznych i wytrzymałościowych połączeń tytanu technicznego (grade 2) lutowanego dyfuzyjnie z użyciem przekładek z miedzi (CF032A) i niklu (Ni 99,0) oraz podano parametry lutowania dyfuzyjnego. Badania metalograficzne przeprowadzono przy zastosowaniu mikroskopii świetlnej. Podano wyniki statycznej próby ścinania uzyskanych połączeń lutowanych.
Omówiono rodzaje niezgodności lutowniczych oraz fizykochemiczne i technologiczne przyczyny ich powstawania. Scharakteryzowano również normę PN-EN ISO 18279 Lutowanie twarde-niezgodności w złączach lutowanych na twardo.
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