Material Parameters and Plastic Instability of Dual-Phase Steel Sheet at 78–700 K

• Conrad Hans

  Materials Engineering Department, North Carolina State University

• Datta K. P.

  Materials Engineering Department, North Carolina State University

書誌事項

タイトル別名

• Material Parameters and Plastic Instability of Dual-Phase Steel Sheet at 78–700 K

抄録

The effect of material parameters on the plastic instability of a dual-phase steel (VAN-QN) sheet in uniaxial tension tested over the temperature range of 78–700 K was investigated employing gridded specimens. Fracture by cleavage occurred at 78 and 200 K and a ductile-to-brittle type transition was indicated in the vicinity of 200 K . The critical strain for diffuse necking ε_d^∗ (which occurred at all temperatures) and that for local necking ε_l^∗ (which occurred at 200–700 K) were found to be in accord with the following derived relationships:<BR>ε_d^∗=n_d+1⁄(δlnε⁄δlnA₀)<BR>ε_l^∗≅2[n_u+m_u(α_l^∗+ε_u)]<BR>where the term δ ln ε⁄δ ln A₀ represents the difference in strain ε at a geometric defect with an initial difference in cross-sectional area A₀. n=d ln σ⁄d ln ε, m=∂ ln σ⁄∂ ln \dotε and α=d ln \dotε⁄d ln ε of the element under consideration, the subscripts indicating the strain at which the measurements were made. The results for the dual-phase steel are compared with those for rimmed steel and the reasons for the better formability of the dual-phase steel at a constant tensile strength are discussed. Dislocation mechanisms operative over the test temperature range are considered.

収録刊行物

• Transactions of the Japan Institute of Metals

  Transactions of the Japan Institute of Metals 23 (9), 544-555, 1982

  社団法人 日本金属学会

キーワード

• General Engineering

詳細情報

• CRID: 1390001205118273536
• NII論文ID: 130003486011
• DOI: 10.2320/matertrans1960.23.544
• ISSN: 24324701
• ISSN: 00214434
• Web Site: https://www.jstage.jst.go.jp/article/matertrans1960/23/9/23_9_544/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可