Delayed cracking behavior of a meta-stable austenitic stainless steel under bending condition

Jinshan He, Xiaofei Guo, Junhe Lian, Sebastian Münstermann, Wolfgang Bleck

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Abstract

The delayed cracking behavior of a meta-stable austenitic stainless steel AISI 301 under bending condition has been investigated at different temperatures, hydrogen contents and external holding forces. The results reveal that the investigated material with an initial hydrogen content of 1 ppm has good bendability at the temperature range between -20 °C and room temperature, which is not susceptible to delayed cracking in atmospheric condition. When the material is pre-charged with 50 ppm hydrogen, the material still shows good bendability. However, it is susceptible to delayed cracking under an external holding force during interrupted bending test. By the measurement of martensitic transformation, the simulation of the stress/strain distributions in the bending specimens and the characterization of fracture surfaces, the effects of hydrogen, stress state and external holding force on delayed cracking behavior have been assessed.
Original languageEnglish
Article number138470
Number of pages16
JournalMATERIALS SCIENCE AND ENGINEERING A: STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume768
Early online date28 Sep 2019
DOIs
Publication statusPublished - 19 Dec 2019
MoE publication typeA1 Journal article-refereed

Keywords

  • Delayed cracking
  • Metastable austenitic stainless steel
  • Hydrogen
  • Bending test

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