Influence of Nb and Mn content on resistance to delayed fracture of ultrahigh strength hot stamped steel sheets

Takuya Kishimoto, Yoshito Takemoto, Takehide Senuma

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

One of the important objectives of hot stamping technology is an increase in tensile strength up to 2000 MPa. The largest obstacle to the realization of the strength increase to this height is a concern over the occurrence of delayed fracture. However, the principle idea for designing chemical compositions and operational conditions for increasing the resistance to delayed fracture has not been established yet. In this paper, the effect of Mn and Nb on the resistance to delayed fracture has been investigated to obtain the principle idea for designing chemical compositions for increasing the resistance to delayed fracture of ultrahigh strength hot stamping steel sheets. The following results were obtained. Nb addition increased the resistance to delayed fracture. A decrease in added Mn also increases the resistance to delayed fracture. Detailed investigations on the effect of Nb and Mn on the resistance to delayed fracture indicated that these alloys in solution, especially segregated in the grain boundary, affected the resistance to delayed fracture. A key requirement to improve the delayed fracture property is to control the segregation behavior of Nb and Mn.

Original languageEnglish
Title of host publication6th International Conference Hot Steel Metal Forming of High-Performance Steel, CHS2 2017- Proceedings
EditorsMats Oldenburg, Braham Prakash, Kurt Steinhoff
PublisherAssociation for Iron and Steel Technology, AISTECH
Pages187-194
Number of pages8
ISBN (Electronic)9781935117667
Publication statusPublished - Jan 1 2017
Event6th International Conference on Hot Steel Metal Forming of High-Performance Steel, CHS2 2017 - Atlanta, United States
Duration: Jun 4 2017Jun 7 2017

Other

Other6th International Conference on Hot Steel Metal Forming of High-Performance Steel, CHS2 2017
CountryUnited States
CityAtlanta
Period6/4/176/7/17

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Metals and Alloys

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  • Cite this

    Kishimoto, T., Takemoto, Y., & Senuma, T. (2017). Influence of Nb and Mn content on resistance to delayed fracture of ultrahigh strength hot stamped steel sheets. In M. Oldenburg, B. Prakash, & K. Steinhoff (Eds.), 6th International Conference Hot Steel Metal Forming of High-Performance Steel, CHS2 2017- Proceedings (pp. 187-194). Association for Iron and Steel Technology, AISTECH.