TY - JOUR
T1 - Effects of Thermal History and Microstructure on Segregation of Phosphorus and Alloying Elements in the Heat-Affected Zone of a Low Alloy Steel
AU - Zhai, Ziqing
AU - Miyahara, Yuichi
AU - Abe, Hiroshi
AU - Watanabe, Yutaka
N1 - Funding Information:
The authors gratefully acknowledge the Central Research Institute of Electrical Power Industry (CRIEPI) for providing the LEAP facility, and the technical assistance of Dr. Masanari Tomozawa and Masaru Sato. The authors would also like to express their gratitude to the Innovative Leader Platform of To-hoku University for the financial support for Ziqing Zhai to conduct APT tests in CRIEPI.
Publisher Copyright:
© 2014, The Minerals, Metals & Materials Society and ASM International.
PY - 2014/10/24
Y1 - 2014/10/24
N2 - The grain boundary segregation of phosphorus and alloying elements in the heat-affected zone (HAZ) of a low alloy steel was studied quantitatively with atom probe tomography. Non-equilibrium segregation mainly occurred during welding and subsequent fast cooling, leading to remarkable segregation of P, C, Mn, and Mo. The segregation of these four types of solutes showed similar microstructure-dependence at this stage, in which the segregation levels are higher in coarse-grained HAZ and intercritically reheated coarse-grained HAZ than in fine-grained HAZ. After simulated aging, P and Mn showed further enrichment at grain boundaries through equilibrium segregation, while desegregation was observed for C and Mo. In addition, it seems that precipitation of Mo at dislocations was greatly promoted during aging, which probably also contributed to the increase of P and Mn at grain boundaries.
AB - The grain boundary segregation of phosphorus and alloying elements in the heat-affected zone (HAZ) of a low alloy steel was studied quantitatively with atom probe tomography. Non-equilibrium segregation mainly occurred during welding and subsequent fast cooling, leading to remarkable segregation of P, C, Mn, and Mo. The segregation of these four types of solutes showed similar microstructure-dependence at this stage, in which the segregation levels are higher in coarse-grained HAZ and intercritically reheated coarse-grained HAZ than in fine-grained HAZ. After simulated aging, P and Mn showed further enrichment at grain boundaries through equilibrium segregation, while desegregation was observed for C and Mo. In addition, it seems that precipitation of Mo at dislocations was greatly promoted during aging, which probably also contributed to the increase of P and Mn at grain boundaries.
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U2 - 10.1007/s11661-014-2582-9
DO - 10.1007/s11661-014-2582-9
M3 - Article
AN - SCOPUS:84919847064
SN - 1073-5623
VL - 45
SP - 6163
EP - 6172
JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
IS - 13
ER -