中國有色金屬學報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 20 Special 3 September 2010 |
forming in semi-solid state
（1. The Research Centre of Forming Technology, University of West Bohemia,
Univerzitni 22, P. O. Box 314, 306 14 Pilsen, Czech Republic;
2. Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava,
Paulinska 16, 917 24 Trnava, Slovak Republic）
Abstract:To obtain new unconventional structures with specific mechanical and physical properties is possible not only by the development of new types of materials but also by treatment of conventional materials using unconventional innovative technological procedures. One of these technologies is the forming in semi-solid state involving rapid solidification of miniature components from steels. Production of such components is complicated by a number of technical problems. To explain phenomena of the process and structure development, the production of miniature components from the tool steel X210Cr12 difficult to form was experimentally tested. The structure of this originally ledeburite steel consisted of 95 % of metastable austenite after the treatment. Metastable austenite was located particularly in globular and polygonal grains while the remaining interspaces were filled by lamellar network. The detected high stability of extremely high fraction of metastable austenite was tested under different conditions of thermal exposition and mechanical loading.
Key words: semi-solid state; semi-solid forming; rapid cooling; metastable austenite; mini-thixoforming
