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Linking constituent phase properties to ductility and edge stretchability of two DP 980 steels by Hu, Xiaohua; Sun, Xin; Raghavan, Kavesary; Comstock, R.J.; Ren, Yang is a Engineering article available to read on EtoBox.

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Two DP 980 steels were characterized with multiple methods to determine its microstructure characteristics, tensile properties and edge stretchability. The first (DP980-B) is a commercial grade DP980 steel produced by AK Steel, while the second (DP980-T) is a modification of the first one by a tempering process. Both contain two individual phases: ferrite and martensite with body centered cubic (BCC) and tetragonal (BCT) crystal structure respectively. ASTM standard tensile tests were performed for both materials, revealing that DP980-B has higher work hardening and larger total elongation than DP980-T. Standard hole piercing and subsequent hole expansion and extrusion tests were also performed. The critical hole expansion ratio (HER) of hole pierced sheet at different nominal clearances, on the other hand, show an opposite trend: the HER of DP980-T almost doubles that of DP980-B. This indicates the tensile ductility and edge stretchability are determined by different mechanisms due to different deformation modes. The ductility of sheet metal during uniaxial tension is determined by deformation instability, i.e. necking, due to less constraint at the region of deformation and fract

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Author

Hu, Xiaohua; Sun, Xin; Raghavan, Kavesary; Comstock, R.J.; Ren, Yang

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0921-5093)

Published

2020

Language

EN

Field

Engineering (Physical Sciences)