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Article Excerpt
"Microstructures matter now." So says James R. Fekete, technical fellow, Materials, Standards & Technology, Global Die & Press Center, Body Manufacturing Engineering, General Motors. He's talking about steel. Specifically, about the category of advanced high-strength steels (AHSS). He makes a related point, one that may change the way you think about what are comparatively new materials. (Comparatively? Well, consider this: the Iron Age started about 12 BC. These AHSS materials were categorized about 10 years ago to, Fekete says, "differentiate the materials from the HSLAs"-that's high-strength, low-alloy-"and bake hardenables." So in the grand scheme of things, AHSS is comparatively brand new.)
[ILLUSTRATION OMITTED]
Fekete: "We all know about composites. There are hard things embedded in soft things. The hard things are about strength; the soft things are about manufacturability. The same is true for steel. It is really a composite. The principles behind the design of the materials...
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