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Prediction model for austenite grains growth during reheating process in Ti micro-alloyed cast steel by coupling precipitates dissolution and coarsening behavior
Chongqing Univ, Coll Mat Sci & Engn, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400030, Peoples R China.;Chongqing Univ, Chongqing Key Lab Vanadium Titanium Met & New Mat, Chongqing 400030, Peoples R China..
Chongqing Univ, Coll Mat Sci & Engn, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400030, Peoples R China.;Chongqing Univ, Chongqing Key Lab Vanadium Titanium Met & New Mat, Chongqing 400030, Peoples R China..
Chongqing Univ, Coll Mat Sci & Engn, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400030, Peoples R China.;Chongqing Univ, Chongqing Key Lab Vanadium Titanium Met & New Mat, Chongqing 400030, Peoples R China..
Chongqing Univ, Coll Mat Sci & Engn, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400030, Peoples R China.;Chongqing Univ, Chongqing Key Lab Vanadium Titanium Met & New Mat, Chongqing 400030, Peoples R China..
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2019 (English)In: Journal of Iron and Steel Research International, ISSN 1006-706X, E-ISSN 2210-3988, Vol. 26, no 2, p. 162-172Article in journal (Refereed) Published
Abstract [en]

A combined model to predict austenite grains growth of titanium micro-alloyed as-cast steel during reheating process was established. The model involves the behaviors of austenite grains growth in continuous heating process and isothermal soaking process, and the variation of boundary pinning efficiency caused by the dissolution and coarsening kinetics of second-phase particles was also considered into the model. Furthermore, the experimental verifications were performed to examine the prediction power of the model. The results revealed that the mean austenite grains size increased with the increase in reheating temperature and soaking time, and the coarsening temperature of austenite grains growth was 1423K under the current titanium content. In addition, the reliability of the predicted results in continuous heating process was validated by continuous heating experiments. Moreover, an optimal regression expression of austenite grains growth in isothermal soaking process was obtained based on the experimental results. The compared results indicated that the combined model in conjunction with precipitates dissolution and coarsening kinetics had good reliability and accuracy to predict the austenite grains growth of titanium micro-alloyed casting steel during reheating process.

Place, publisher, year, edition, pages
SPRINGER , 2019. Vol. 26, no 2, p. 162-172
Keywords [en]
Austenite grains growth, Reheating process, Precipitate dissolution, Precipitate coarsening, Prediction model
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-247846DOI: 10.1007/s42243-018-0187-zISI: 000460599000007Scopus ID: 2-s2.0-85062513435OAI: oai:DiVA.org:kth-247846DiVA, id: diva2:1299109
Note

QC 20190326

Available from: 2019-03-26 Created: 2019-03-26 Last updated: 2019-04-04Bibliographically approved

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Dong, Zhihua

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