Sintered Dual-phase Steels Produced from Pre-alloyed Fe-Cr-Mo Powder
Wananurat Srijampan [a], Monnapas Morakotjinda [b], Rungtip Krataitong [b], Thanyaporn Yotkaew [b], Nattaya Tosangthum [b], Amporn Wiengmoon [a] and Ruangdaj Tongsri *[b]* Author for corresponding; e-mail address: ruangdt@mtec.or.th
Volume: Vol.43 No.2 (SPECIAL ISSUE 1)
Research Article
DOI:
Received: 15 September 2015, Revised: -, Accepted: 26 November 2015, Published: -
Citation: Srijampan W., Morakotjinda M., Krataitong R., Yotkaew T., Tosangthum N., Wiengmoon A., et al., Sintered Dual-phase Steels Produced from Pre-alloyed Fe-Cr-Mo Powder, Chiang Mai Journal of Science, 2016; 43(2): 358-364.
Abstract
The sintered Fe-Cr-Mo-xC steels (where x = 0.05, 0.15, 0.25, 0.35 and 0.45 wt.% C) were produced by vacuum sintering and followed by slow cooling. The sintered steels showed microstructures consisting of mixed a + a¢ phases. The formation of a¢ phase was discussed with respect to the classical model for bainitic transformation. The morphologies of the a¢ phase regions changed from a thick film to a dark island to a bulk form with increasing C content. With the added C contents < 0.25 wt.%, the sintered steels showed low tensile strength and hardness but high ductility. When the C contents ≥ 0.25 wt.%, the sintered Fe-Cr-Mo-xC steels gained strength from the a¢ phase, whose volume fraction was increased with increasing C content.