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          Launch Of A New Class of 3 rd Generation Cold Formable AHSS

          2018-11-05 09:52:00
          LUQIMENG
          Original
          2312
          Overview
          ? 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



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