The Future is Forming

• Lubricant Testing-Henkel: modified LDH-short stroke (no split, 200mm/min. Stamping forces lube into surface roughness

• Lubricant Testing: used Autoform Sigma to determine friction. Want to ID deformation/pressures to simulate real world

Labels: 2010-01-0990, Advanced High Strength Steels, Henkel, Lubricant Testing, SAE

Posted by Engineering Quality Solutions at 4:27 PM | Permalink |
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• Sheared Edge Stretching Failure Limit-Chrysler, US Steel,Colorado School of Mines: measure thickness easier than grid

• Sheared Edge Stretching Failure Limit- uniaxial tensile strain at edge. Higher stains give crosshatched necking bands

• Sheared Edge Stretching Failure Limit- in DP600, FLCo is 2x thinning limit. In TRIP700, it is 3x. For the data shown

• Sheared Edge Stretching Failure Limit-previous post-laser cut edge comparison: thinning limit about 10% in both grade

• Sheared Edge Stretching Failure Limit-shearing rather than laser cut drops thinning limit by about 3%

Labels: 2010-01-0986, Advanced High Strength Steels, Chrysler, Colorado School of Mines, SAE, US Steel

Posted by Engineering Quality Solutions at 12:16 PM | Permalink |
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• Extending Tensile Curves beyond Uniform Elong Using Digital Image Correlation-Ford; post unif stress strain data

• Using Digital Image Correlation for Post Uniform Tensile Elongation; full field, small gauge length, hi accuracy

• DIC for Post Uniform Tensile Elongation: smaller gauge length gives longer valid range of stress strain curves.

Labels: 2010-01-0981, Advanced High Strength Steels, Ford, SAE

Posted by Engineering Quality Solutions at 2:19 PM | Permalink |
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• Experimental Determination of the Yield Locus for AHSS-ArcelorMittal- no experimental evidence: costly, complicated

• AHSS Yield Locus: considered tension shear &plane strain test. Balanced biaxial: cruciform,bulge,stacked compression.

• AHSS Yield Locus: stacked compression method used. Friction at interface between platen & specimens was insignificant

• AHSS Yield Locus: yield behavior up to 4% plastic strain is well represented by Von mises yield surface.

Labels: 2010-01-0976, Advanced High Strength Steels, ArcelorMittal, SAE

Posted by Engineering Quality Solutions at 8:07 AM | Permalink |
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• AHSS Springback Predictions-ArcelorMittal: predicted springback is highly dependant on material model chosen.

Labels: 2010-01-0980, Advanced High Strength Steels, ArcelorMittal, SAE

Posted by Engineering Quality Solutions at 3:02 PM | Permalink |
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• Bonding Fracture Toughened Adhesives & GA Steels-Dow/ArcelorMittal- perception is FTA isn't needed b/c Zn layer delam

• FTA-GA Steel Bonding: orig study was 20 yrs ago on EDDS (weak grain boundaries). Not with AHSS-it's cohesive failure.

• FTA-GA Steel Bonding: Fracture Toughened Adhesive has better energy absorption/impact than typcal hem flange adhesive

Labels: 2010-01-0434, Advanced High Strength Steels, ArcelorMittal, Dow, SAE

Posted by Engineering Quality Solutions at 9:57 AM | Permalink |
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• Video Extensometry during High Temp Tensile Testing of Al Coated Boron Steel: OSU/Severstal- props not directional

• High Temp Tensile Tests of Boron Steel: surface roughness increases with coating diffusion time and saturates

• Hi Temp Tensile Tests of Boron Steel: challenge- gripping specimen, thermal expansion, hard on equipment, non-contact

• Hi Temp Boron Steel Tensile Test: used multiple reference markers for hi speed camera tracking (used welding wire)

• Hi Temp Boron Steel Tensile Test: low accuracy at low strains. Strain rate dependence more significant at hi temps.

Labels: 2010-01-0436, Advanced High Strength Steels, Ohio State University, SAE, Severstal

Posted by Engineering Quality Solutions at 4:53 PM | Permalink |
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• Tensile Deformation of TRIP590 Steel from Digital Image Correlation-GM: 1.5mm thick, 500 frames captured per test.

• Using DIC for TRIP590 tensiles: up to 10% difference in true strain at UTS depending on orientation re: rolling dir

• Using DIC for TRIP590 tensiles: How much of variation in flat sheet properties make a difference in final vehicle?

Labels: 2010-01-0444, Advanced High Strength Steels, General Motors, SAE

Posted by Engineering Quality Solutions at 7:13 AM | Permalink |
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• Forming Effects to Product Attribute Coupled CAE Process-Ford: forming changes props, so used these props in CAE.

• Incorporating Forming Effects into CAE: 2mm thick- big difference (14%) by using forming effects in crush testing.

• Incorporating Forming Effects into CAE: Even if full forming sim isn't used, putting in a uniform 2% prestrain helps.

• Incorporating Forming Effects into CAE: differences between using and not are more prominent in DP600 than HSLA350

Labels: 2010-01-0448, Advanced High Strength Steels, Ford, SAE

Posted by Engineering Quality Solutions at 11:29 AM | Permalink |
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• Fatigue Performance of 2mm DP780 and Mild Steel GMAW Lap Joints: AISI and AET Integration: 4 weld geometries tested.

• GMAW Fatigue: DP780 has 4x higher fatigue life and higher run-out load using optimized production-intent geometry.

• GMAW Fatigue: 10x fatigue life improvement possible in DP780 by optimizing geometry and eliminating gaps.

• GMAW Fatigue: weld geometry must be considered when comparing weld fatigue life of various steel grades.

Labels: 2010-01-0449, Advanced High Strength Steels, AET Integration, AISI, SAE

Posted by Engineering Quality Solutions at 6:25 AM | Permalink |
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• Boron Steel Bumper Beams- U of M & Martinrea- Assumed forming takes place w/in 0.5 second of 13 second cycle.

• Boron Steel Bumper Beams- forming T 800degC. At this temp, 110MPa YS; 138 MPa TS. Failure criteria: thinning>16%.

Labels: 2010-01-0433, Advanced High Strength Steels, Martinrea, SAE, UM-Dearborn

Posted by Engineering Quality Solutions at 4:38 PM | Permalink |
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• Hydrogen Embrittlement of AHSS- Colorado School of Mines. Just a few ppm of hydrogen in steel decreases elongation.
  

• DP, TRIP, TWIP, martensite studied, all 1 to 1.2mm. Cathodic charged w/ DC power supply.
  




• 1-3ppm of H typ dropped elong by 50% for all AHSS except for TWIP, where elong is relatively insensitive to hydrogen.
  




• Hydrogen charging changed fracture mode from ductile void to cleavage.
  

Labels: 2010-01-0447, Advanced High Strength Steels, Colorado School of Mines, SAE

Posted by Engineering Quality Solutions at 3:37 PM | Permalink |
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• DP780 Sheared Edge Extension- Chiriac at US Steel- 1mm GA with flat bottom punch. FMTI grid analyzer with 1mm grid.
  

• Conical punch gave 10% greater hole expansion. Conical simulates flanging, but flat punch is better for stretch edge.
  

Labels: 2010-01-0441, Advanced High Strength Steels, SAE, US Steel

Posted by Engineering Quality Solutions at 9:59 PM | Permalink |
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• Quench + Partition Steel- Baosteel built new line that can make grade. Normal CAL or CGL cannot get thermal profile.
  

• Q+P: 1000 MPa tensile combined with 25% elongation. Line can produce 1280mm wide.
  

Labels: 2010-01-0439, Advanced High Strength Steels, Baosteel, SAE

Posted by Engineering Quality Solutions at 9:33 PM | Permalink |
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Posted by Engineering Quality Solutions at 8:15 AM | Permalink |
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