Reduction of Cracks During Punching Process by Cementite in High Tensile Strength Steel Sheets

Takehiro Okano, Chikara Inoue*, Shinsuke Suzuki, Kazuhiko Yamazaki, Shunsuke Toyoda


研究成果: Article査読

3 被引用数 (Scopus)


An experimental study on high tensile strength steel sheets with ferritic and ferrite–cementite microstructures was performed with the objective of determining the crack formation and propagation mechanism in the punching process. In addition, the effect of dispersed cementites was also investigated. SEM, EPMA, and EBSD analyses confirmed that voids initiate at the ferrite-inclusion/precipitate (TiN, TiS, and cementite) interface, and the voids then propagate into the ferrite matrix by cleavage. EPMA, EBSD, and TEM/EDS demonstrated that cracks which formed within and near a center segregation area propagate along the Mn center segregation by intergranular fracture due to Mn segregation at the grain boundary. In addition to TiN and TiS, observation of the number of cracks, the length of cracks in the punched surface, and the number density of voids in tensile fracture parts indicated that dispersed cementites are also void formation factors, and cementites decrease the number of cracks and average crack length in the punched surface of ferrite–cementite steel sheets by reducing the stress applied to the voids.

ジャーナルMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
出版ステータスPublished - 2019 2月 15

ASJC Scopus subject areas

  • 凝縮系物理学
  • 材料力学
  • 金属および合金


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