On the Solidification of a H23 Tool Steel
The H23 tool steel contains high concentration of carbide forming elements, which affect the microstructure and mechanical properties. This present study described the microstructure and mechanical properties of the as cast H23 tool steel. The steel was prepared by vacuum induction melting. The microstructural investigation used XRD and electron microscope. The nano hardness and elastic moduli of matrix and carbide were also measured. The results show that the as cast microstructure consisted of ferrite matrix and M6C, MC and M23C6 carbides. The eutectic M6C carbides had two different morphologies owing to different growth mechanisms. There was agreement between the experimental results and the calculated solidification path for the H23 tool steel regarding the presence of carbides in the microstructure. The nanohardness and elastic moduli of ferrite matrix and M6C carbides were respectively 4.2 ± 0.2 and 10.6 ± 1.2 and 198.3 ± 10.2 and 253.5 ± 11.7 GPa.
Dibuat oleh : Meilinda Nurbanasari, Panos Tsakiropoulos, Eric J. Palmiere
Alamat e-mail : nurbanasarimeilinda@yahoo.com
Kata Kunci : Solidification, H23, tool steel, microstructure, M6C
Keterangan : Karya Ilmiah ini dimuat pada Journal of Transactions of the Indian Institute of Metals, 67(2014) page: 935–944.