Evolving AHSS Types

In response to automotive demands for additional AHSS capabilities, steel industry research continues to develop new types of steel. These steels are designed to reduce density, improve strength, and/or increase elongation. For example, Nano steels are designed to avoid the low values of edge stretch (local elongation) experienced by DP and TRIP steels. Instead of islands of martensite, the ferrite matrix is strengthened with ultra-fine nano-sized (<10 Nm) particles. This is accomplished in hot-rolled high strength steel with a tensile strength around 750 MPa. The resulting steel has a high YS/TS ratio with an excellent balance of total elongation and local elongation (hole expansion ratio). Other examples of these developing steels are ultrafine grain, low density, and high Young's modulus steels.

 

Figure 1-6 - Schematic with large, dark grey ellipse indicating one current area of research for steels with improved properties, reduced cost, and improved weldability

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Posted by santillane on Feb 26 2010 12:25PM
It is an interesting issue.I do not know what are these nano particles, and I would like to understand how to get the ultra-fine nano-sized particles. Is it by undercooling? nano-alloying? If somebody can help, I would appreciate it. Thanks.
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