Thermal effects on the enhanced ductility in non-monotonic uniaxial tension of DP780 steel sheet

2016 ◽  
Vol 22 (6) ◽  
pp. 968-973 ◽  
Author(s):  
Omid Majidi ◽  
Frederic Barlat ◽  
Yannis P. Korkolis ◽  
Jiawei Fu ◽  
Myoung-Gyu Lee
Keyword(s):  
Uniaxial Tension ◽  
Thermal Effects ◽  
Steel Sheet ◽  
Dp780 Steel

Coupling Recrystallization and Texture to the Mechanical Properties of Ferritic Stainless Steel Sheet

2004 ◽  
Vol 467-470 ◽  
pp. 317-322 ◽  
Author(s):  
Chad W. Sinclair ◽  
J.D. Mithieux
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Yield Strength ◽  
Uniaxial Tension ◽  
Ferritic Stainless Steel ◽  
Steel Sheet ◽  
Careful Consideration ◽  
Stainless Steel Sheet ◽  
Careful Control ◽  
R Value

Obtaining optimal mechanical properties for highly formable ferritic stainless steel sheet requires careful control over recrystallization and texture. This is, in some cases, hampered by the slow approach to final recrystallization associated with the disappearance of deformed grains with particular orientations. The important mechanical properties for formability (e.g. the yield strength and r-value) are thus strongly dependent on the final few percent recrystallization. In this study, it has been attempted to correlate the microstructure and texture of ferritic stainless steel sheet to its mechanical properties as measured in uniaxial tension. It is shown that careful consideration of the evolution of texture and microstructure with recrystallization may explain the observed trends.

A Study on the Formability of IF and Plain Carbon Mild Steels

2010 ◽  
Author(s):  
Mohamadreza Nourani ◽  
Hossein Aliverdilu ◽  
Hossein Monajati Zadeh ◽  
Hamid Khorsand ◽  
Ali Shokuhfar ◽  
...  
Keyword(s):  
Uniaxial Tension ◽  
Steel Sheet ◽  
Raw Material ◽  
Forming Limit ◽  
Interstitial Free ◽  
If Steel ◽  
Sheet Metals ◽  
Original Design ◽  
Engineering Strain ◽  
Stamping Process

Steel sheet metals are widely used in different industries due to their high strength, good weldability, availability, moderate cost, and the ability to form to complex 3D parts. The study of the formability of sheet metals is often done by means of Forming Limit Diagram (FLD) which presents the major and minor engineering strain thresholds under different deformation states. In this article, the formability parameters of three different steel sheet metals with the same thickness have been determined by uniaxial tension test and their FLDs have been produced by Hecker method: RRSt14O3, Zinc coated IF (Interstitial Free) steel and uncoated IF steel. Also the materials’ formability during the stamping process of a car door inner panel has been investigated as a case study to substitute the original design of raw material, coated IF steel, with a cheaper alternative. Among the tested materials to form the part, the uniaxial tension results showed that the formability parameters of uncoated IF steel was higher than the coated IF steel and the parameters of RRSt14O3 sheet metal was the lowest. The FLD of coated IF steel sheet was the highest (best formability). Differences among the formability parameters in uniaxial tension, the FLDs, and the stamping behavior of the part with different steel sheet metals have been explained by their surface roughnesses and the friction coefficients that affect the material flow during the FLD test as well as the stamping process.

scholarly journals Flow Behavior of Laser Welded Boron Steel Sheet in Uniaxial Tension at Elevated Temperature

2011 ◽  
Vol 20 (5) ◽  
pp. 362-368 ◽  
Author(s):  
D. Kim ◽  
J.H. Kim ◽  
D.H. Yoo ◽  
K. Chung ◽  
Y. Kim ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Uniaxial Tension ◽  
Steel Sheet ◽  
Flow Behavior ◽  
Boron Steel

Strain-Path Effects on the Formability Behavior of Interstitial-Free Steel

2015 ◽  
Vol 651-653 ◽  
pp. 126-131
Author(s):  
Jetson Lemos Ferreira ◽  
José Osvaldo Amaral Tepedino ◽  
Marco Antonio Wolff ◽  
Luciano Pessanha Moreira
Keyword(s):  
Uniaxial Tension ◽  
Plane Strain ◽  
Strain Path ◽  
Steel Sheet ◽  
Interstitial Free ◽  
If Steel ◽  
Biaxial Stretching ◽  
Nominal Thickness ◽  
Strain Paths ◽  
If Steel Sheet

In this work, the formability behavior of Interstitial-Free (IF) steel sheet, grade DC07 with 0.65 mm of nominal thickness, was evaluated by means of both linear and bi-linear strain-paths to define the Forming Limit Curve (FLC) at the onset of necking according to ASTM E22182 standard. In the first strain-path, flat-bottomed punch with 200 mm diameter and 10 mm corner die radius was adopted together with counter-blanks of an IF steel sheet grade DC07 with 0.80 mm nominal thickness in order to yield two equal amounts of plastic work under uniaxial tension and under equibiaxial stretching strain-paths. Afterwards, Nakajima’s 100 mm hemispherical punch stretching procedure and bulge tests were adopted to determine the FLC of both as-received and strained DC07 blanks with the help of an automated digital image correlation system to define the linear and bi-linear limit strains. Increasing the straining level (5 and 10%) of the first strain-path in uniaxial tension improved the limit strains of the DC07 steel sheet between the plane-strain intercept (FLC0) and the biaxial stretching region of the FLC. On the other hand, blanks which were firstly pre-strained in equibiaxial stretching mode (4.8 and 9%) provided better formability in the FLC drawing region and reduced limit strains in plane-strain and biaxial stretching regions.

Thermal Effects on Polymer Laminated Steel Formability in Ironing

2000 ◽  
Vol 123 (2) ◽  
pp. 225-230 ◽  
Author(s):  
Chen-Hsi Huang ◽  
Steven R. Schmid ◽  
Jyhwen E. Wang
Keyword(s):  
Plastic Deformation ◽  
Thermal Effects ◽  
Polymer Coating ◽  
Steel Sheet ◽  
High Pressures ◽  
Manufacturing Processes ◽  
Coated Steel ◽  
Manufacturing Operations ◽  
Coated Steel Sheet ◽  
Expensive Process

In the current manufacturing processes for can making, a time consuming and therefore expensive process involves spraying a food-contact safe polymer coating onto the can interior before filling. This process can be eliminated by using a prelaminated metal workpiece as long as the polymer will survive the manufacturing operations involved in can making. The most demanding operation in can making is ironing because of the high pressures involved as well as the necessary generation of new surface. Previous research [5] has demonstrated the feasibility of using a polymer coated steel sheet stock for can making. However, ironing is commonly performed with elevated tooling temperatures which result from friction and plastic deformation in the workpiece. As such, it is possible that the polymer could significantly soften or melt during the ironing process when tooling/workpiece contact is most intimate. In this paper, the thermal effects of hot tooling on polymer coated steel formability are explored through both experiments and mathematical models.

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