Contributions of Rare Earth Element (La,Ce) Addition to the Impact Toughness of Low Carbon Cast Niobium Microalloyed Steels

Hadi Torkamani; Shahram Raygan; Carlos Garcia Mateo; Jafar Rassizadehghani; Yahya Palizdar; David San-Martin

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자료유형: 학술저널

저자정보: Hadi Torkamani (University of Tehran) Shahram Raygan (University of Tehran) Carlos Garcia Mateo (National Center for Metallurgical Research (CENIM)) Jafar Rassizadehghani (University of Tehran) Yahya Palizdar (Materials and Energy Research Center) David San-Martin (National Center for Metallurgical Research (CENIM))

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.24 No.4

발행연도: 2018.1

수록면: 773 - 788 (16page)

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In this research Rare Earth elements (RE), La and Ce (200 ppm), were added to a low carbon cast microalloyed steel todisclose their infl uence on the microstructure and impact toughness. It is suggested that RE are able to change the interactionbetween the inclusions and matrix during the Solidification process (comprising peritectic transformation), which couldaff ect the microstructural features and consequently the impact property; compared to the base steel a clear evolution wasobserved in nature and morphology of the inclusions present in the RE-added steel i.e. (1) they changed from MnS-based to(RE,Al)(S,O) and RE(S)-based; (2) they obtained an aspect ratio closer to 1 with a lower area fraction as well as a smalleraverage size. Besides, the microstructural examination of the matrix phases showed that a bimodal type of ferrite grain sizedistribution exists in both base and RE-added steels, while the mean ferrite grain size was reduced from 12 to 7 μm andthe bimodality was redressed in the RE-added steel. It was found that pearlite nodule size decreases from 9 to 6 μm in theRE-added steel; however, microalloying with RE caused only a slight decrease in pearlite volume fraction. After detailedfractography analyses, it was found that, compared to the based steel, the signifi cant enhancement of the impact toughnessin RE-added steel (from 63 to 100 J) can be mainly attributed to the Differences observed in the nature of the inclusions, theferrite grain size distribution, and the pearlite nodule size. The presence of carbides (cementite) at ferrite grain boundariesand probable change in distribution of Nb-nanoprecipitation (promoted by RE addition) can be considered as other reasonsaff ecting the impact toughness of steels under investigation.

참고문헌 (68)

참고문헌 신청

J. Rassizadehghani / 2007 / J. Mater. Sci. Technol. 23:779

J.R. Davis / 2001 / Alloying: Understanding the Basics

H. Najaf / 2011 / Mater. Des. 32:656

K.Y. Xie / 2012 / Scr. Mater. 66:710

H. Najaf / 2008 / Mater. Sci. Eng. A 486:1

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