scholarly journals Novel concepts in weld metal science: Role of gradients and composite structure

1991 ◽  
Author(s):  
D.K. Matlock ◽  
D.L. Olson
Keyword(s):  
Weld Metal ◽  
Composite Structure ◽  
Metal Science

The Influence of Oxygen-Rich Inclusions on the Nature of Austenite Decomposition Products of Weld Metal Deposits

1983 ◽  
Vol 21 ◽  
Author(s):  
M. Ferrante ◽  
K. Akune
Keyword(s):  
Weld Metal ◽  
Catalytic Effect ◽  
Thermal Contraction ◽  
Austenite Decomposition ◽  
Decomposition Products ◽  
The Matrix

ABSTRACTRecent studies carried out on weld metal have called attention to the role of oxygen-rich inclusions on austenite decomposition. This investigation describes some evidences of the catalytic effect of dislocations upon the γ → α transformation. These defects are generated at the matrix inclusion interface and its presence has been ascertained by TEM. Estimates of the stresses arising from differences in thermal contraction between inclusion and matrix on cooling confirm microstructural observations.

Experimental Validation of Role of Cut-Out Parameters on Modal Responses of Laminated Composite — A Coupled FE Approach

2020 ◽  
Vol 12 (06) ◽  
pp. 2050068 ◽  
Author(s):  
Hukum Chand Dewangan ◽  
Subrata Kumar Panda ◽  
Nitin Sharma
Keyword(s):  
Composite Structure ◽  
Laminated Composite ◽  
Element Model ◽  
Composite Panel ◽  
Design Constraint ◽  
Isoparametric Finite Element ◽  
Proposed Model ◽  
Free Vibration Frequency ◽  
First Time

The free vibration frequency responses of the laminated composite structure with a cut-out of variable shapes (square/circular/elliptical), position (center/eccentric) and orientation (parallel/inclined) are investigated for the first time in this research including geometrical shapes. The eigenvalues are obtained computationally for the cut-out borne structure via a linear isoparametric finite element model of the composite structure in association with cubic-order of displacement kinematics. Also, a coupled code is prepared in MATLAB environment by joining the higher-order formulation and the simulation model (ABAQUS) to achieve the generic form to investigate the influential cut-out parameter (shape, size and position) on their eigenvalues. Further, a series of experimentations are carried out using the cut-out borne composite panel and compared with the computational frequency, including the experimental properties. Finally, the key behavior is surveyed through different kinds of numerical examples for various design constraint parameters including the cut-out relevant factors (shape, position and orientation) to show the subsequent inclusiveness of the proposed model.

The role of addition of Ni on the microstructure and mechanical behaviour of C-Mn weld metals

Exacta ◽  
2008 ◽  
Vol 5 (1) ◽  
Author(s):  
Vicente Braz da Trindade ◽  
João Da Cruz Payão ◽  
Luís Felile Guimarães Souza ◽  
Ronaldo Da Rocha Paranhos
Keyword(s):  
Heat Treatment ◽  
Weld Metal ◽  
Nickel Content ◽  
Stress Relief ◽  
Impact Testing ◽  
Microstructural Refinement ◽  
Weld Metals ◽  
The Impact ◽  
Submerged Arc

The aim in this work is to study the influence of nickel content (as-welded state and after stress relief heat treatment) on the microstructure and toughness of CMn weld metals obtained with submerged arc welding. The nickel content vary between 0.50 wt.% and 3.11 wt.%. The microstructures were observed using optical microscopy (OM) and scanning electron microscopy (SEM). The toughness was evaluated by Charpy-V impact testing in samples cut transversally to the weld bead. The impact energy showed that nickel content up to 1 wt.% improves the toughness due to the increase of the acicular ferrite (AF) content and microstructural refinement. On the other hand, higher nickel contents have a deleterious effect on the toughness due to the presence of the microconstituent martensite-austenite (M-A) in the weld metal. The stress relief heat treatment did not improve too much the weld metal toughness, even the M-A suffering decomposition (ferrite+carbide). This may be explained by the precipitation of carbides along the boundaries of the ferrite.

Low carbon steel weld metal microstructures: The role of oxygen and manganese

1987 ◽  
Vol 9 (3) ◽  
pp. 253-267 ◽  
Author(s):  
P. F. Chaveriat ◽  
G. S. Kim ◽  
S. Shah ◽  
J. E. Indacochea
Keyword(s):  
Carbon Steel ◽  
Weld Metal ◽  
Low Carbon Steel ◽  
Steel Weld ◽  
Low Carbon ◽  
Steel Weld Metal
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