Proceedings of the 5th International Conference on Metals & Hydrogen P110

Proceedings of the 5th International Conference on Metals & Hydrogen P110

Hydrogen embrittlement evaluation of advanced high-strength steels (ahss)

Marcus Vinicius Pereira Arruda (1)1 , Fernando de Souza Costa (2)2 , José Eduardo Silveira Leal (3)3 , Luiz Fernando Maia de Almeida (4)4 , Sinésio Domingues Franco (5)5

  • (1) 1

    Materials Engineer, MSc., Research and Development, Usiminas, Ipatinga, MG, Brazil.

  • (2) 2

    Physicist, DSc., Research and Development, Usiminas, Ipatinga, MG, Brazil.

  • (3) 3

    Mechanical Engineer, DSc., Department of Mechanical Engineering, Universidade Federal de Uberlândia, Uberlândia, MG, Brazil.

  • (4) 4

    Mechanical Engineer, MSc., Department of Mechanical Engineering, Universidade Federal de Uberlândia, Uberlândia, MG, Brazil.

  • (5) 5

    Mechanical Engineer, Dr.-Ing, Professor; Department of Mechanical Engineering, Universidade Federal de Uberlândia, Uberlândia, MG, Brazil.

Abstract

The intensive use of advanced high strength steels (AHSS) has provided great advances in the automotive industry, especially related to passenger safety and the reduction of GHG emissions. Usually, these steels are more susceptible to the effect of hydrogen in the degradation of their mechanical properties, especially the ductility. Therefore, a test method was developed to evaluate the susceptibility to delayed cracking of a third-generation cold-rolled AHSS steel of the strength class of 1000 MPa. The hydrogen contents were obtained from Thermal Desorption Analysis (TDA) and the critical level for tensile tests with constant load on precharged samples was defined. The test method also allows the evaluation of the effect of hydrogen on the change of the fracture mode of specimens loaded with different hydrogen contents.

Keywords

  • AHSS
  • Hydrogen embrittlement
  • Delayed Cracking.

Introduction


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