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AbstractAbstract
[en] Static strain aging of type AISI 304 austenitic stainless steel was studied from room temperature up to 623K by conducting tests in which the load was held approximately constant. The aging times varied between 10s and 100h, using a plastic pre-deformation of 9%. The static strain aging of 304 steel furnished an activation energy of 23.800 cal/mol. This implies that vacancies play an important role on the aging process. The curve of the variation of the discontinuous yielding with aging time presented different stages, to which specific mathematical expressions were developed. These facts permited the conclusion that Snock type mechanisms are responsible for the aging in such conditions. (Author)
[pt]
Estudou-se o envelhecimento estatico por deformacao do aco inoxidavel austenitico AISI 304 entre ambiente e 623K atraves de testes realizados sob carga mantida aproximadamente constante. Os tempos de envelhecimento variaram desde 10s ate 100h, enquanto que a pre-deformacao plastica foi mantida em 9%. Obteve-se uma energia de ativacao para o processo de 23.800 cal/mol, o que indica a participacao efetiva de lacunas no envelhecimento do aco AISI 304. Definiu-se topologicamente a correlacao entre o acrescimo de tensao resultante do envelhecimento estatico, identificando-se as equacoes constitutivas correspondentes. Estas equacoes permitem caracterizar os mecanismos responsaveis pelo envelhecimento, que neste caso e do tipo Snock. (Autor)Original Title
Caracterizacao topologica do envelhecimento estatico do aco inoxidavel austenitico
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Source
1981; 11 p; 6. Brazilian Congress of Mechanical Engineering; Rio de Janeiro (Brazil); 15 - 18 Dec 1981
Record Type
Miscellaneous
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Conference
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