Formal analysis of isothermal martensite spread

Materials Research

Paulo Rangel Rios¹  José Roberto Costa Guimarães¹ 

[1] ,Universidade Federal Fluminense Escola de Engenharia Industrial Metalúrgica de Volta Redonda Volta Redonda RJ ,Brazil

关键词: martensitic phase transformation;    kinetics;    microstructure;    analytical methods;    grain-size effects;   

DOI  :  10.1590/S1516-14392008000100020

来源: SciELO

【 摘 要 】

A formal kinetic approach was applied to the spread of isothermal martensite over the neighboring austenite grains in a Fe-23.2 wt. (%) Ni-2.8 wt. (%) Mn alloy. The number of grains in a spread event changed with parent austenite grain size. However, isothermal martensite spread formed from fine-grained parent austenite and athermal martensite from a Fe-31 wt. (%) Ni-0.02 wt. (%) C alloy studied in a previous work followed the same microstructural path. The number of grains per spread- event found in the present study was shown to be consistent with the number of neighbors of the grain originating the spread event by means of a simple geometrical model of the parent austenite grain network. The study of the kinetics of isothermal martensite spread showed that the nucleation rate of the spread-event in isothermal martensite remained constant during the transformation. This result parallels the constant nucleation rate of the spread-event also found using the same methodology in athermal martensite formed in a Fe-31 wt. (%) Ni-0.02 wt. (%) C alloy studied in a previous work.

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