Effect of chemical composition on microstructure and mechanical properties of laser weld metal of high-tensile-strength steel

详细信息    查看全文

• 作者：Hiroyuki Sumi ; Kenji Oi ; Koichi Yasuda
• 关键词：Laser welding ; Weld metal ; Microstructure ; Toughness ; Hardness ; High ; strength steels
• 刊名：Welding in the World
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：59
• 期：2
• 页码：173-178
• 全文大小：1,592 KB
• 参考文献：1. Russell JD (2000) Laser weldability of C-Mn steels. Weld World 44-:23-8
  2. Kristensen JK (2001) Laser welding in ship building, a challenge to research and development for more than a decade. Proc. of 7th Int. Aachen Welding Conf. on High productivity joining processes - fundamentals, applications and equipment (iASTK 2001), Aachen
  3. Kristensen JK (2002) Trends and developments within welding and allied process. IIW Int. Conf. advanced processes & technologies in welding & allied processes, Copenhagen
  4. Koga H, Goda H, Terada S, Hirota K, Nakayama S, Tsubota S (2010) First application of hybrid laser-arc welding to commercial ships. Mitsubishi Heavy Ind Tech Rev 47-:59-4
  5. Nakanishi Y, Yamaoka H, Inose K, Yasuda K (2009) Yousetu-Gizyutu 57-1:54-9 (in Japanese)
  6. Ikawa H, Oshige H, Tanoue T (1980) Effect of martensite-austenite constituent on the HAZ toughness of a high strength steel, IIW Doc. IX-1156-80
  7. Kurosawa F, Taguchi I, Tanino M (1981) An application of the SPEED method (Selective Potentiostatic Etching by Electrolytic Dissolution) to the study of ferrous materials. Bull Jpn Inst Met 20-:377-84 (in Japanese) CrossRef
  8. Terasaki T, Akiyama T, Serino M (1984) Chemical compositions and welding procedure to avoid cold cracking. Proc. Int. Conf. Joining and Metals, Helsingor, pp 381-86
  9. Ohmori Y, Ohtani H, Kunitake T (1971) The bainite in low carbon low alloy high strength steels. Trans ISIJ 11:250-59
  10. Bramfitt BL, Speer JG (1990) A perspective on the morphology of bainite. Metall Trans A 21A-:817-29 CrossRef
  
• 刊物主题：Metallic Materials; Continuum Mechanics and Mechanics of Materials; Theoretical and Applied Mechanics;
• 出版者：Springer Berlin Heidelberg
• ISSN：1878-6669

文摘

Laser beam welding (LBW) and laser-arc hybrid welding are expected to be applied to welding of high-strength steel plates over 780?MPa, because they have advantages such as low distortion and a narrow heat-affected zone. This research examined the relationship between the chemical composition of high-strength steel plates and the microstructure and mechanical properties of the weld metal with the aim of improving the toughness of welded joints of high-strength steels by the LBW process. The results revealed that weld metal toughness is strongly dependent on the carbon (C) content of the steel plates, and excellent toughness can be obtained in weld metals with low C contents having an almost fully lower bainite structure without formation of slender martensite austenite constituent (MA). Based on these results, a guideline for appropriate alloying element design for high-strength steels for LBW was proposed, targeting mechanical properties of tensile strength ?80?MPa and toughness vE?0?°C?≥-7?J.