TPWJ, 2009, #1, 2-5 pages
EVALUATION OF SUSCEPTIBILITY OF WELDED JOINTS OF HEAT-RESISTANT CHROMIUM MARTENSITIC STEEL TO CRACKING AT HEAT TREATMENT
Journal The Paton Welding Journal
Publisher International Association «Welding»
ISSN 0957-798X (print)
Issue № 1, 2009 (January)
V.Yu. SKULSKY, A.K. TSARYUK and S.I. MORAVETSKY
E.O. Paton Electric Welding Institute, NASU, Kiev, Ukraine
The mechanisms of cracking of welded joints in tempering used to relieve stresses are considered. It has been found that welded joints on steel 10Kh9MFB with a homogeneous martensitic structure are insensitive to temper cracking. Formation of δ-ferrite in the martensitic structure may lead to cracking of the weld metal. Cracks form in tempering in the range of about 450-550 °C as a result of concentrated deformation within the zone of soft ferrite interlayers in development of secondary hardening of the martensitic matrix. A probable cause of hardening is precipitation of chromium carbide M7
arc welding, martensitic steel, welded joints, heat treatment, dispersion hardening, soft interlayers, temper cracking
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