Cargando…

Effect of Shear Stress on Isothermal Crystallization Behavior of CaO-Al(2)O(3)-SiO(2)-Na(2)O-CaF(2) Slags

How to coordinate the contradiction between lubrication and heat transfer in the peritectic steel casting process is the key technical difficulty in preparing mold fluxes. The mold fluxes that are required for casting are subjected to the shear stress generated by mold oscillation and slab movement,...

Descripción completa

Detalles Bibliográficos
Autores principales: Gu, Shaopeng, Wen, Guanghua, Ding, Zequan, Tang, Ping, Liu, Qiang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6073865/
https://www.ncbi.nlm.nih.gov/pubmed/29949866
http://dx.doi.org/10.3390/ma11071085
_version_ 1783344286413094912
author Gu, Shaopeng
Wen, Guanghua
Ding, Zequan
Tang, Ping
Liu, Qiang
author_facet Gu, Shaopeng
Wen, Guanghua
Ding, Zequan
Tang, Ping
Liu, Qiang
author_sort Gu, Shaopeng
collection PubMed
description How to coordinate the contradiction between lubrication and heat transfer in the peritectic steel casting process is the key technical difficulty in preparing mold fluxes. The mold fluxes that are required for casting are subjected to the shear stress generated by mold oscillation and slab movement, which affects the crystallization performance of slags. The quantitative effect of slags’ crystallization performance by shear stress is studied to develop a low-basicity and high-crystallization mold flux to solve the above problem. The results show that the crystallization kinetic condition is promoted, and the crystallization activation energy is reduced by the shear stress, which leads to an increase in the crystallization temperature. Concurrently, the crystal size is reduced. However, the shear stress has no effect on the crystalline phase. The influence of different shear stresses on the crystallization ability of molten slags is related to the crystal nucleation and growth mechanisms. The crystalline fraction of the slag films at 300 rpm (69 s(−1)) is 44.7%, which is an increase of 17.7% compared with the crystalline fraction of the slag films at 200 rpm (46 s(−1)). Moreover, the shear stress has little effect on the lubricating properties of the mold fluxes, although the crystallization ability is promoted by the agitation.
format Online
Article
Text
id pubmed-6073865
institution National Center for Biotechnology Information
language English
publishDate 2018
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-60738652018-08-13 Effect of Shear Stress on Isothermal Crystallization Behavior of CaO-Al(2)O(3)-SiO(2)-Na(2)O-CaF(2) Slags Gu, Shaopeng Wen, Guanghua Ding, Zequan Tang, Ping Liu, Qiang Materials (Basel) Article How to coordinate the contradiction between lubrication and heat transfer in the peritectic steel casting process is the key technical difficulty in preparing mold fluxes. The mold fluxes that are required for casting are subjected to the shear stress generated by mold oscillation and slab movement, which affects the crystallization performance of slags. The quantitative effect of slags’ crystallization performance by shear stress is studied to develop a low-basicity and high-crystallization mold flux to solve the above problem. The results show that the crystallization kinetic condition is promoted, and the crystallization activation energy is reduced by the shear stress, which leads to an increase in the crystallization temperature. Concurrently, the crystal size is reduced. However, the shear stress has no effect on the crystalline phase. The influence of different shear stresses on the crystallization ability of molten slags is related to the crystal nucleation and growth mechanisms. The crystalline fraction of the slag films at 300 rpm (69 s(−1)) is 44.7%, which is an increase of 17.7% compared with the crystalline fraction of the slag films at 200 rpm (46 s(−1)). Moreover, the shear stress has little effect on the lubricating properties of the mold fluxes, although the crystallization ability is promoted by the agitation. MDPI 2018-06-26 /pmc/articles/PMC6073865/ /pubmed/29949866 http://dx.doi.org/10.3390/ma11071085 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Gu, Shaopeng
Wen, Guanghua
Ding, Zequan
Tang, Ping
Liu, Qiang
Effect of Shear Stress on Isothermal Crystallization Behavior of CaO-Al(2)O(3)-SiO(2)-Na(2)O-CaF(2) Slags
title Effect of Shear Stress on Isothermal Crystallization Behavior of CaO-Al(2)O(3)-SiO(2)-Na(2)O-CaF(2) Slags
title_full Effect of Shear Stress on Isothermal Crystallization Behavior of CaO-Al(2)O(3)-SiO(2)-Na(2)O-CaF(2) Slags
title_fullStr Effect of Shear Stress on Isothermal Crystallization Behavior of CaO-Al(2)O(3)-SiO(2)-Na(2)O-CaF(2) Slags
title_full_unstemmed Effect of Shear Stress on Isothermal Crystallization Behavior of CaO-Al(2)O(3)-SiO(2)-Na(2)O-CaF(2) Slags
title_short Effect of Shear Stress on Isothermal Crystallization Behavior of CaO-Al(2)O(3)-SiO(2)-Na(2)O-CaF(2) Slags
title_sort effect of shear stress on isothermal crystallization behavior of cao-al(2)o(3)-sio(2)-na(2)o-caf(2) slags
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6073865/
https://www.ncbi.nlm.nih.gov/pubmed/29949866
http://dx.doi.org/10.3390/ma11071085
work_keys_str_mv AT gushaopeng effectofshearstressonisothermalcrystallizationbehaviorofcaoal2o3sio2na2ocaf2slags
AT wenguanghua effectofshearstressonisothermalcrystallizationbehaviorofcaoal2o3sio2na2ocaf2slags
AT dingzequan effectofshearstressonisothermalcrystallizationbehaviorofcaoal2o3sio2na2ocaf2slags
AT tangping effectofshearstressonisothermalcrystallizationbehaviorofcaoal2o3sio2na2ocaf2slags
AT liuqiang effectofshearstressonisothermalcrystallizationbehaviorofcaoal2o3sio2na2ocaf2slags