Study on the constitutive model of boron steel 22MnB5 with different phase fractions

Fangfang Li, Jianping Lin, Mingwang Fu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

3 Citations (Scopus)


The mechanical properties of boron steel 22MnB5 is determined by phase fractions. In order to obtain the mechanical properties and service performance of car component by simulation accurately, a microstructure based constitutive model needs to be developed. In this paper, different area fractions of martensite, bainite and ferrite in boron steel 22MnB5 were obtained via control of cooling rate and the different microstructures were determined quantitatively by metallographic image processing. A modified Katsuro Inoue’s constitutive model was then proposed, which is a function of effective plastic strain, strain rate and the phase fractions of martensite, bainite and ferrite. On the other hand, crash simulation of B-pillar with tailored mechanical properties was conducted as a case study to investigate the relationship between microstructure and property configuration by using the modified Katsuro Inoue’s model. The relationship among phase fraction, the height of tailored segment, and the internal energies absorbed by different segments, the maximum acceleration and displacement of B-pillar during the collision process was studied, and the empirical equations between microstructure and dynamic response of crash performance were also established and formulated.
Original languageEnglish
Pages (from-to)1323-1331
Number of pages9
JournalInternational Journal of Precision Engineering and Manufacturing
Issue number10
Publication statusPublished - 1 Oct 2016


  • 22MnB5
  • B-pillar
  • Microstructure
  • Tailored mechanical properties

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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