id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
ap-572	Leinonen, J. I.	Superior Properties of Ultra-fine-grained Steels	2004	4	.pdf	application/pdf	2491	129	66	Numerous research projects to develop still better struc- tural steels, e.g. “ultra steels” or “super steels”, have been commenced all over the world since the mid-1990s, espe- cially in Asia (e.g. Japan, South Korea, China), Australia and Europe. The effect of ferrite grain size on yield strength and impact transition temperature (tough/brittle), extrapolated to ultra-fine grain sizes, is shown in Fig.	cache/ap-572.pdf	txt/ap-572.txt