In-Situ Observation of Solidification and High Temperature Phase Transformation of Hypo-Peritectic Steels
A few investigations on peritectic transition of Fe-C binary alloy by confocal laser scanning microscope(CLSM)have been reported.But Investigations on peritectic transition of actually produced steel by CLSM were rare.In this paper,solidification and high temperature phase transformation of commercial steel with composition of 0.11%C-0.02%Si-0.56%Mn-0.035%Al-0.012%P-0.007%S were observed in-situ at very slow cooling rate from liquid by CLSM with the cylindrical specimen(Φ8 mm×3mm)to investigate the formation of δ and γ phase and the peritectic transition.And the Fe-C-X multicomponent phase diagrams created via Thermocalc Software were employed to elaborate the observed events.The results showed that:(i)with the cooling rate of 0.05K/s,the solidification mode of the tested steel was that the δ ferrite appeared from the liquid phase first;(ii)the γ phase precipitated by peritectic reaction(L + δ → γ)between the δ ferrite phase and the liquid phase around δ ferrite grain boundaries at 1485℃ and three-phase coexisted; iii)With temperature further decreasing,the liquid phase disappeared at 1476℃,the retained δ ferrite phase transformed into γ phase.
Hypo-peritectic steels solidification phase transformation In-situ observation CLSM
Xuehua LIU Zheng YANG Kezhi YANG Yuanting WANG
Maanshan Iron & Steel Co.,Ltd,Maanshan 243000 Anhui,China
国际会议
the 6th International Congress on the Science and Technology of Steelmaking,ICS2015(第六届国际炼钢科技大会)
北京
英文
673-676
2015-05-12（万方平台首次上网日期，不代表论文的发表时间）