Optimization Of Laboratory Hot Rolling Of Brittle Fe-40at.%Al-Zr-B Aluminide

Archives of Metallurgy and Materials

J. Kopeček¹  M. Jabłońska²  E. Hadasik²  P. Kawulok³  S. Rusz³  I. Schindler³  R. Fabík³  R. Kawulok³  P. Opěla³ 

[1]INSTITUTE OF PHYSICS AS CR, V. V. I., NA SLOVANCE 1999/2, 182 21 PRAHA 8, CZECH REPUBLIC

[2]SILESIAN UNIVERSITY OF TECHNOLOGY, FACULTY OF MATERIALS ENGINEERING AND METALLURGY, KRASI?SKIEGO 8, 40-019 KATOWICE, POLAND

[3]VSB – TECHNICAL UNIVERSITY OF OSTRAVA, FACULTY OF METALLURGY AND MATERIALS ENGINEERING, 17. LISTOPADU 15, 708 33 OSTRAVA – PORUBA, CZECH REPUBLIC

关键词: Keywords: iron aluminides;    as-cast structure;    low plasticity;    hot rolling;    recrystallization;    EBSD analysis;    grain size;    FEM simulation;   

DOI  :  10.1515/amm-2015-0293

学科分类：金属与冶金

来源: Akademia Gorniczo-Hutnicza im. Stanislawa Staszica / University of Mining and Metallurgy

【 摘 要 】

Use of the protective steel capsules enabled to manage the laboratory hot flat rolling of the extremely brittle as-cast aluminide Fe-40at.%Al-Zr-B with the total height reduction of almost 70 %. The hot rolling parameters were optimized to obtain the best combination of deformation temperature (from 1160°C up to 1240°C) and rolling speed (from 0.14 m·s−1 to 0.53 m·s−1). The resistance against cracking and refinement of the highly heterogeneous cast microstructure were the main criteria. Both experiments and mathematical simulations based on FEM demonstrated that it is not possible to exploit enhanced plasticity of the investigated alloy at low strain rates in the hot rolling process. The heat flux from the sample to the working rolls is so intensive at low rolling speed that even the protective capsule does not prevent massive appearance of the surface transverse cracking. The homogeneity and size of product’s grain was influenced significantly by temperature of deformation, whereas the effect of rolling speed was relatively negligible. The optimal forming parameters were found as rolling temperature 1200°C and the rolling speed 0.35 m·s−1. The effective technology of the iron aluminide Fe-40at.% Al-Zr-B preparation by simple processes of melting, casting and hot rolling was thus established and optimized.

【 授权许可】

Unknown