Launch Of A New Class of 3 rd Generation Cold Formable AHSS
- 2018-11-05 09:52:00
- LUQIMENG Original
- 2840
? History / Technological Breakthroughs
? Current Status
o NanoSteel 3 rd Generation AHSS Technology
? Enabling Structures and Mechanisms
o Performance Characteristics
? Tensile Properties
? Bend Performance
? Bi-Axial Performance
? Forming Limit Diagram
o Novel Performance Characteristics
? Local Formability at Hole Expansion
? Draw ability & Hydrogen Assisted Delayed Cracking Resistance
NanoSteel’s Advanced High-Strength Sheet steels are designed for production in conventional steel mills using existing technology.
NanoSteel 3 rd Generation AHSS Technology
Performance Characteristics
Novel Performance Characteristics
Controlled by:
? Hole Preparation e.g. die clearance, punch geometry
? Global Materials Properties: e.g Total elongation, UTS, post uniform elongation
? Microstructure response to stress adds additional optimization variable
Drawing Conditions
? Cups drawn to LDR at 1.9 draw ratio
? Cups exposed to 100% hydrogen for 45 minutes
? Exposed cups monitored in air for over 6 months
? Exposure to hydrogen for 10 minutes after each incremental 5% increase in strain
? Samples exposed to 100% hydrogen while under load for 45 minutes
? Clamped for >100 hours after exposure without cracking
o NanoSteel 3 rd Generation AHSS Technology
? Initial product delivered for OEM testing at 60,000 MPa%
? Enabled due to unique structures and mechanisms
o Compelling Performance Characteristics
? Strength & ductility combination
? Bend ability with low R/t ratio
? Bi-axial performance with high Limiting Dome Height
? Superior Forming Limit Diagram
o Novel Performance Enabled by Specific Microstructural Response to Stress
? High local formability for Hole Expansion
? Avoidance of hydrogen assisted delayed cracking resistance at LDR
