Ductile-to-brittle transition temperature as a measure of the crack resistance of steels

For the purpose of prevention of brittle fracture of metals, two approaches based on the concepts of the ductile-to-brittle transition temperature and the critical defect length have been formulated. This paper presents in brief the principles of the proposal to unite these approaches and discusses further prospects of its experimental verification and practical use. The essence of the proposed union of the two approaches is shown schematically. The relationship of the different ductile-to-brittle transition temperatures to specimen thickness obtained in impact bend tests of 15Kh2NMFA steel is shown. The method described in this article opens the possibility of elimination of the lack of agreement in calculations for the brittle fracture resistance of structures