Effect of ausforming parameters on strain-induced phase transformation and isothermally transformed bainite
The presence of strain-induced phases formed in the course of ausforming step has been proven by thermodynamic calculation, microstructural observation and hardness examination, besides that, the effect of ausforming parameters on isothermally transformed bainite during austempering step was also es...
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doaj-f5792b712b0947c1a016004fa1e26a2b2021-03-19T07:26:01ZengElsevierJournal of Materials Research and Technology2238-78542021-03-0111982991Effect of ausforming parameters on strain-induced phase transformation and isothermally transformed bainiteHui Guo0Ya-ping Fan1Zi-xuan Li2Qiang Li3Xian-ying Feng4Facility Horticulture Laboratory of Universities in Shandong, Weifang University of Science and Technology, Weifang, 262700, PR China; School of Mechanical Engineering, Shandong University, Jinan, 250012, PR ChinaFacility Horticulture Laboratory of Universities in Shandong, Weifang University of Science and Technology, Weifang, 262700, PR ChinaSchool District of Daotian Town, Weifang, 262700, PR ChinaFacility Horticulture Laboratory of Universities in Shandong, Weifang University of Science and Technology, Weifang, 262700, PR China; Corresponding author.School of Mechanical Engineering, Shandong University, Jinan, 250012, PR ChinaThe presence of strain-induced phases formed in the course of ausforming step has been proven by thermodynamic calculation, microstructural observation and hardness examination, besides that, the effect of ausforming parameters on isothermally transformed bainite during austempering step was also essentially investigated. The results indicated that the types of strain-induced phases were determined by ausforming temperature and strain, for instance, the trace of strain-induced martensite could be detected in the sample subjected to ausforming at 300 °C for 20% strain. However, ausforming would introduce strain-induced bainite at a higher ausforming temperature (500 °C) instead of strain-induced martensite, which could gradually increase the average thickness of bainitic ferrite lath and impair bulk hardness with raising ausforming strain. Although ausforming process lessened the maximum attainable volume fraction of bainitic ferrite formed during austempering stage due to austenite mechanical stabilization, the existence of strain-induced martensite and the refined bainitic sheaves would make a contribution to hardness improvement when ausformed at 300 °C.http://www.sciencedirect.com/science/article/pii/S2238785421000879AusformingStrain-induced transformationThermodynamic criteriaAustemperingUltra-fine bainitic steel |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Hui Guo Ya-ping Fan Zi-xuan Li Qiang Li Xian-ying Feng |
spellingShingle |
Hui Guo Ya-ping Fan Zi-xuan Li Qiang Li Xian-ying Feng Effect of ausforming parameters on strain-induced phase transformation and isothermally transformed bainite Journal of Materials Research and Technology Ausforming Strain-induced transformation Thermodynamic criteria Austempering Ultra-fine bainitic steel |
author_facet |
Hui Guo Ya-ping Fan Zi-xuan Li Qiang Li Xian-ying Feng |
author_sort |
Hui Guo |
title |
Effect of ausforming parameters on strain-induced phase transformation and isothermally transformed bainite |
title_short |
Effect of ausforming parameters on strain-induced phase transformation and isothermally transformed bainite |
title_full |
Effect of ausforming parameters on strain-induced phase transformation and isothermally transformed bainite |
title_fullStr |
Effect of ausforming parameters on strain-induced phase transformation and isothermally transformed bainite |
title_full_unstemmed |
Effect of ausforming parameters on strain-induced phase transformation and isothermally transformed bainite |
title_sort |
effect of ausforming parameters on strain-induced phase transformation and isothermally transformed bainite |
publisher |
Elsevier |
series |
Journal of Materials Research and Technology |
issn |
2238-7854 |
publishDate |
2021-03-01 |
description |
The presence of strain-induced phases formed in the course of ausforming step has been proven by thermodynamic calculation, microstructural observation and hardness examination, besides that, the effect of ausforming parameters on isothermally transformed bainite during austempering step was also essentially investigated. The results indicated that the types of strain-induced phases were determined by ausforming temperature and strain, for instance, the trace of strain-induced martensite could be detected in the sample subjected to ausforming at 300 °C for 20% strain. However, ausforming would introduce strain-induced bainite at a higher ausforming temperature (500 °C) instead of strain-induced martensite, which could gradually increase the average thickness of bainitic ferrite lath and impair bulk hardness with raising ausforming strain. Although ausforming process lessened the maximum attainable volume fraction of bainitic ferrite formed during austempering stage due to austenite mechanical stabilization, the existence of strain-induced martensite and the refined bainitic sheaves would make a contribution to hardness improvement when ausformed at 300 °C. |
topic |
Ausforming Strain-induced transformation Thermodynamic criteria Austempering Ultra-fine bainitic steel |
url |
http://www.sciencedirect.com/science/article/pii/S2238785421000879 |
work_keys_str_mv |
AT huiguo effectofausformingparametersonstraininducedphasetransformationandisothermallytransformedbainite AT yapingfan effectofausformingparametersonstraininducedphasetransformationandisothermallytransformedbainite AT zixuanli effectofausformingparametersonstraininducedphasetransformationandisothermallytransformedbainite AT qiangli effectofausformingparametersonstraininducedphasetransformationandisothermallytransformedbainite AT xianyingfeng effectofausformingparametersonstraininducedphasetransformationandisothermallytransformedbainite |
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