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- Title
EFFECT OF STRESS-STRAIN STATE ON STRUCTURE AND PROPERTIES OF JOINTS IN DIFFUSION WELDING OF DISSIMILAR METALS.
- Authors
KVASNITSKY, V. V.; KVASNITSKY, V. F.; MARKASHOVA, L. I.; MATVIENKO, M. V.
- Abstract
Computer modelling of stress-strain state (SSS) considering change of physical-mechanical properties, structural transformations and creep strains determined that distribution of plastic strains along the joint butt in diffusion welding (DW) of dissimilar materials is non-uniform. The results of mechanical tests of welded joints provide estimation not for different zones of joint but welded joint integral estimation. Aim of the work is determination of effect of SSS on structure and properties of joints in different zones of joint butt at constant temperature of DW and using temperature cycling. Welding of steel 12Kh18N10T and electric steel 10864 (armco-iron) was carried out at constant temperature 1050 °C and two temperature cycles 700-1000 °C. Welded joints were subjected to microstructural and local X-ray microanalysis. Hardness distribution was studied. Significant attention was made to study of fine structure of metal in joint zone and estimation of specific contribution of different structural constituents in total value of yield strength of the welded joints, considering dependence of dislocation density on value and intensity of plastic strain. Carried investigations confirm the results of SSS computer modelling and presence of significant zone of deformation stagnation in DW with constant temperature. It is determined that DW with temperature cycling allows controlling SSS, intensifying processes of volume interaction and providing full strength of 10864 steel joints.
- Subjects
STRESS-strain curves; JOINTS (Engineering); WELDED joint testing; MECHANICAL stress analysis; DIFFUSION measurements; RESIDUAL stresses; METAL analysis
- Publication
Paton Welding Journal, 2014, Issue 8, p8
- ISSN
0957-798X
- Publication type
Article
- DOI
10.15407/tpwj2014.08.01