Microstructure and properties of high strength weld metals

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Presentation transcript:

Microstructure and properties of high strength weld metals Lars-Erik Svensson Volvo Powertrain Lars-Erik Svensson Sheet & Screw Joint Technologies

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

Applications of high strength steels Background Review Discussion Applications of high strength steels Lars-Erik Svensson Sheet & Screw Joint Technologies

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

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

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

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

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

Complications Background Review Discussion 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

Background Review Discussion Yield and tensile strength vs Pcm - parameter Lars-Erik Svensson Sheet & Screw Joint Technologies

Hardenability 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

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

Background Review Discussion Impact toughness vs Pcm – parameter Lars-Erik Svensson Sheet & Screw Joint Technologies

Microstructure Background Review Discussion 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

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

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

Keehan Background Review Discussion OK 75.78 0.5 Mn – 7 Ni 2 Mn – 7 Ni Lars-Erik Svensson Sheet & Screw Joint Technologies

Tensile strength: Impact toughness: Background Review Discussion 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

Lower yield strength at higher Pcm 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

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

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

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

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

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