1 / 23

Microstructure and properties of high strength weld metals

Microstructure and properties of high strength weld metals. Lars-Erik Svensson Volvo Powertrain. Background Review Discussion. Background Review Discussion. Applications of high strength steels. Background Review Discussion.

crystalm
Download Presentation

Microstructure and properties of high strength weld metals

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Microstructureand properties of high strength weld metals Lars-Erik Svensson Volvo Powertrain Lars-Erik Svensson Sheet & Screw Joint Technologies

  2. Background ReviewDiscussion Lars-Erik Svensson Sheet & Screw Joint Technologies

  3. Background ReviewDiscussion Applications of high strength steels Lars-Erik Svensson Sheet & Screw Joint Technologies

  4. Background Review Discussion Lars-Erik Svensson Sheet & Screw Joint Technologies

  5. Background Review Discussion Lars-Erik Svensson Sheet & Screw Joint Technologies

  6. Background Review Discussion Lars-Erik Svensson Sheet & Screw Joint Technologies

  7. Background Review Discussion Lars-Erik Svensson Sheet & Screw Joint Technologies

  8. Background Review Discussion Lars-Erik Svensson Sheet & Screw Joint Technologies

  9. Background Review Discussion Complications Keehan: Manual Metal Arc, ISO-procedure, cooling time 10 s Banguru et al: MIG/MAG, girth weld procedure, cooling time 5 s Lars-Erik Svensson Sheet & Screw Joint Technologies

  10. Background ReviewDiscussion Yield and tensile strength vs Pcm - parameter Lars-Erik Svensson Sheet & Screw Joint Technologies

  11. Background Review Discussion Pcm = C + Si/30 + (Mn + Cu + Cr)/20 + Ni/60 + Mo/15 + V/10 + 5B Hardenability Lars-Erik Svensson Sheet & Screw Joint Technologies

  12. Background ReviewDiscussion Yield and tensile strength vs Pcm – parameter (Fairchild, Banguru et al) Lars-Erik Svensson Sheet & Screw Joint Technologies

  13. Background ReviewDiscussion Impact toughness vs Pcm – parameter Lars-Erik Svensson Sheet & Screw Joint Technologies

  14. Background Review Discussion Microstructure Esab OK 75.78: bainite Low Mn, low Ni: allotriomorphic ferrite High Mn, medium Ni: acicular ferrite + martensite (+ bainite) Low Mn, high Ni: acicular ferrite, martensite, ferrite side plates (?)/bainite High Mn, high Ni: bainite + martensite Lars-Erik Svensson Sheet & Screw Joint Technologies

  15. Background Review Discussion Microstructure Lars-Erik Svensson Sheet & Screw Joint Technologies

  16. Background Review Discussion Banguru et al Lars-Erik Svensson Sheet & Screw Joint Technologies

  17. OK75.78 0.5 Mn – 7 Ni 2 Mn – 7 Ni Background Review Discussion Keehan Lars-Erik Svensson Sheet & Screw Joint Technologies

  18. Background Review Discussion • Tensile strength: • based on Pcm comparison – good correlation • based on microstructure: weld metals containing ”softer” constituents (AF) give higher strength ?? • Impact toughness: • AF-containing weld metals generally higher impact toughness • more difficult property to compare Lars-Erik Svensson Sheet & Screw Joint Technologies

  19. Background Review Discussion • Lower yield strength at higher Pcm • Need to understand plastic deformation of bainitic/martensitic microstructures Lars-Erik Svensson Sheet & Screw Joint Technologies

  20. Keehan: role of coalesced bainite Banguru et al: ”active” particles (Ti, Zr) Background Review Discussion Development of microstructure: Significant differences Lars-Erik Svensson Sheet & Screw Joint Technologies

  21. Background Review Discussion Lars-Erik Svensson Sheet & Screw Joint Technologies

  22. Background Review Discussion Successful development of high strength weld metals Lars-Erik Svensson Sheet & Screw Joint Technologies

  23. Background Review Discussion Successful development of high strength weld metals Lars-Erik Svensson Sheet & Screw Joint Technologies

More Related