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Effect of Welding Thermal Cycles on Microstructure and Mechanical Properties of Simulated Heat Affected Zone for a Weldox 1300 Ultra-High Strength Alloy Steel

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Języki publikacji
EN
Abstrakty
EN
In the present study, the investigation of weldability of ultra-high strength steel has been presented. The thermal simulated samples were used to investigate the effect of welding cooling time t8/5 on microstructure and mechanical properties of heat affected zone (HAZ) for a Weldox 1300 ultra-high strength steel. In the frame of these investigation the microstructure was studied by light and transmission electron microscopies. Mechanical properties of parent material were analysed by tensile, impact and hardness tests. In details the influence of cooling time in the range of 2,5 ÷ 300 sec. on hardness, impact toughness and microstructure of simulated HAZ was studied by using welding thermal simulation test. The microstructure of ultra-high strength steel is mainly composed of tempered martensite. The results show that the impact toughness and hardness decrease with increase of t8/5 under condition of a single thermal cycle in simulated HAZ. The increase of cooling time to 300 s causes that the microstructure consists of ferrite and bainite mixture. Lower hardness, for t8/5 ≥ 60 s indicated that low risk of cold cracking in HAZ for longer cooling time, exists.
Twórcy
  • Institute of Welding, Testing of Materials Weldability and Welded Constructions Department, 16-18 Bł. Czesława Str., 44-100 Gliwice, Poland
autor
  • Institute of Welding, Testing of Materials Weldability and Welded Constructions Department, 16-18 Bł. Czesława Str., 44-100 Gliwice, Poland
  • SSAB Poland Sp.zo.o., Kolejowa Str. 15, 55-020 Żórawina, Poland
Bibliografia
  • [1] W. Ozgowicz, E. Kalinowska-Ozgowicz, Investigations on the impact strength of constructional high-strength Weldox steel at lowered temperaturę, Archives of Materials Science and Engineering 32, 89-94 (2008).
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  • [12] R. D. Stout, W. D. Doty, Weldability of steels. Welding Research Council, New York 1971.
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  • [14] J. Slania, Influence of phase transformations in the temperature rangers of 1250-1000 C and 650-350 C on the ferrite content in austenitic welds made with T 23 12 LRM3 tubular electrode, Archives of Metallurgy and Materials 50, 757-767 (2005)
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  • [20] EN 1321:1996 Destructive tests on welds in metallic materials - Macroscopic and microscopic examination of welds.
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Uwagi
PL
Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-fe9cd5a0-c3f8-4216-b345-0ae1f20070ff
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