TY - JOUR
T1 - Investigation using 4D-CT of massive-like transformation from the δ to γ phase during and after δ-solidification in carbon steels
AU - Yasuda, Hideyuki
AU - Hashimoto, Takahiro
AU - Sei, Naoki
AU - Morishita, Kohei
AU - Yoshiya, Masato
N1 - Funding Information:
4D-CT experiments were performed as general projects (2016A1454, 2016B1458, 2017B1463) at BL20B2 and BL20XU at SPring-8 (JASRI), Japan. This study was initiated by the “visualization of solidification”researchgroupinthe19thCommitteeonSteelmakingofJSPS.Thestudywasdeveloped in part by “Heterogeneous Structure Control: Towards Innovative Development of Metallic Structural Materials”intheIndustry–AcademiaCollaborativeR&DProgram(JST).4D-CTtechniquesdeveloped by a Grant-in-Aid for Scientific Research (S) (No. 17H06155) were also used. We thank Joshua Yearsley,MS,fromEdanzGroup(www.edanzediting.com/ac)foreditingadraftofthismanuscript.
Publisher Copyright:
© Published under licence by IOP Publishing Ltd.
PY - 2019/6/17
Y1 - 2019/6/17
N2 - For a long time, the γ phase in metallic alloys has seemed to be produced through a peritectic reaction between the δ and liquid phases. However, direct observations have shown that a massive-like transformation, in which the δ phase transforms into the γ phase in the solid state, is dominant during or after solidification of the δ phase in carbon steels. To characterize such massive-like transformation, we use time-resolved tomography (4D-CT) to demonstrate the volume change during cooling from the melt and the crystallographic orientation relationship between the δ and γ phases. The volume changes from solidification and from the massive-like transformation from the δ to the γ phase were -3% and -0.5%, respectively. The transformation from the δ to the γ phase finished quickly, as demonstrated by the volume change. Fine γ grains were produced even in a single δ grain through the massive-like transformation. Also, the refined γ grains showed a wide crystallographic distribution.
AB - For a long time, the γ phase in metallic alloys has seemed to be produced through a peritectic reaction between the δ and liquid phases. However, direct observations have shown that a massive-like transformation, in which the δ phase transforms into the γ phase in the solid state, is dominant during or after solidification of the δ phase in carbon steels. To characterize such massive-like transformation, we use time-resolved tomography (4D-CT) to demonstrate the volume change during cooling from the melt and the crystallographic orientation relationship between the δ and γ phases. The volume changes from solidification and from the massive-like transformation from the δ to the γ phase were -3% and -0.5%, respectively. The transformation from the δ to the γ phase finished quickly, as demonstrated by the volume change. Fine γ grains were produced even in a single δ grain through the massive-like transformation. Also, the refined γ grains showed a wide crystallographic distribution.
UR - http://www.scopus.com/inward/record.url?scp=85067888257&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85067888257&partnerID=8YFLogxK
U2 - 10.1088/1757-899X/529/1/012013
DO - 10.1088/1757-899X/529/1/012013
M3 - Conference article
AN - SCOPUS:85067888257
SN - 1757-8981
VL - 529
JO - IOP Conference Series: Materials Science and Engineering
JF - IOP Conference Series: Materials Science and Engineering
IS - 1
M1 - 012013
T2 - Joint 5th International Conference on Advances in Solidification Processes, ICASP 2019 and 5th International Symposium on Cutting Edge of Computer Simulation of Solidification, Casting and Refining, CSSCR 2019
Y2 - 17 June 2019 through 21 June 2019
ER -