Effects of Thermal History and Microstructure on Segregation of Phosphorus and Alloying Elements in the Heat-Affected Zone of a Low Alloy Steel

Autor:	Ziqing Zhai, Yuichi Miyahara, Yutaka Watanabe, Hiroshi Abe
Rok vydání:	2014
Předmět:	Heat-affected zone Materials science Precipitation (chemistry) Phosphorus Metallurgy Alloy steel Metals and Alloys chemistry.chemical_element Welding Atom probe engineering.material Condensed Matter Physics Microstructure law.invention chemistry Mechanics of Materials law engineering Grain boundary
Zdroj:	Metallurgical and Materials Transactions A. 45:6163-6172
ISSN:	1543-1940 1073-5623
DOI:	10.1007/s11661-014-2582-9
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2f48dfa07aec9ac5d0368d3d3fdf8f7e https://doi.org/10.1007/s11661-014-2582-9 Zobrazit plný text záznamu Full text from SpringerLink