Evaluation of common constitutive equations for solidifying steel

Pierer, Robert; Bernhard, Christian; Chimani, Christian

doi:10.1007/bf03165316

Cited by 11 publications

(17 citation statements)

References 12 publications

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“…[25,26] Due to the constant global strain rate during the SSCT tests, a simple elasto-plastic approach is sufficient. The total strain e tot (t) is split into an elastic term e el (t) and an inelastic term e pl (t).…”

Section: High Temperature Strengthmentioning

confidence: 99%

“…In general, the difference between the calculated and measured curves is highest for the initial slope. The reasons for this effect have been analyzed in detail in a previous paper, [25] and can be found in the relatively low stiffness and the geometrical characteristics of the testing arrangement, as well as in the commonly overestimated Young's modulus for temperatures near the solidus. The agreement between the measured and calculated tensile force is excellent.…”

Section: High Temperature Strengthmentioning

confidence: 99%

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Metallurgical Aspects of Casting High‐Manganese Steel Grades

et al. 2006

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The possibility of using new, high-strength steels with an attractive forming behaviour (e.g. induced plasticity steels) in automotive manufacturing, offers a significant potential for improvement in the area of reducing the weight while simultaneously increasing crash safety. Induced plasticity steels not only possess high strength but also excellent elongation properties and high energy absorption capacities due to the TRIP and TWIP effects, Table 1. [1±4] This profile of mechanical properties is of great interest for crash-relevant automotive components.Common TWIP steel concepts are based on high Mn and Al contents, which are known to cause various problems during steelmaking. The search for suitable primary and secondary steelmaking processes, and the feasibility of casting these steel grades on conventional continuous casting machines, is the focus of ongoing research. The aim of the work presented here is to provide a basis for decisions on the subsequent development of the industrial production of high-Mn and -Al steels.At the very beginning, the following potential difficulties for the continuous casting of high-Mn, high-Al steels were identified: [5] ± high-temperature strength: is expected to be extremely high for these steels, and thus may be a problem for the strand guiding and soft reduction system in casting machines;± hot tearing: the wide brittle-temperature range during the solidification of high-Mn and -Al steels indicates a high crack susceptibility;± segregation at the micro-and macroscopic levels: possible formation of banded structures, resulting in difficulties during further processing;± non-metallic inclusions: the possible interaction between precipitates and mechanical properties means that steel cleanliness levels (secondary metallurgy) should be defined;± scale formation: partial oxidation plays a role in the formation of surface cracks in the casting and rolling process.This list does not consider necessary process adjustments, such as the development of suitable mold powders for highAl steels.The work presented here is concerned with the high-temperature mechanical properties of an high strength structural steel (HSSS) steel and the high-Mn, high-Al steel X50MnAl 25 1 in comparison to common ultra low carbon (ULC) and electrical sheet (ES) steels, the latter both known not to cause many problems during the continuous casting process. MethodologyThe high-temperature mechanical properties and the crack susceptibility were analyzed using the SSCT (submerged split-chill tensile) method. The principle of this testing method is described in detail elsewhere. [6±8] The SSCT test was developed to simulate the shell straining during the continuous casting process. A steel cylinder, split in two halves, is submerged in a liquid steel melt inside an induction fur- COMMUNICATIONS

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Section: High Temperature Strengthmentioning

confidence: 99%

Section: High Temperature Strengthmentioning

confidence: 99%

Metallurgical Aspects of Casting High‐Manganese Steel Grades

et al. 2006

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“…Roll misalignment was proven to provoke internal cracks once total strain at the solid/liquid interface exceeded the critical strain for the examined chemical composition of steel slabs. As creep was proven to be important in the continuous casting of steels, an evaluation of common constitutive equations was performed (Pierer at al, 2005) and tested against experimental data. The proposed results could help in the development of more sophisticated 2D finite element models.…”

Section: Previous Work and Current Statusmentioning

confidence: 99%

Modeling Solidification Phenomena in the Continuous Casting of Carbon Steels

Sismanis¹

2011

Two Phase Flow, Phase Change and Numerical Modeling

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“…Fachinotti and Cardona (2003) reviewed data on mechanical behavior of steels, not precipitation hardening alloy in particular, and concluded that the strain-rate dependence at high temperature could have an important contribution to the mechanical behavior during continuous casting. Pierer et al (2005) used the data provided by Kozlowski et al (1992) for the Ramberg-Osgood and Norton's law for ST 52 steel.…”

Section: Review Of Computer Models For Wax Shell and Alloy Deformationmentioning

confidence: 99%

“…Other options would be to use viscoplastic data that were obtained for other steels (Table 4.10). Pierer et al (2005) used the data provided by Kozlowski et al (1992) for the Ramberg-Osgood and Norton's law for ST 52 steel. Thus, for isotropic linear hardening, ProCAST recommends the use of a fraction of the Young's modulus, i.e., H=E/20.…”

Section: Thermomechanical Materials Property For 17-4ph Steelmentioning

confidence: 99%

Predicting Pattern Tooling and Casting Dimensions for Investment Casting, Phase III

Sabau¹

2008

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We would like to thank Srinath Viswanathan of ORNL, who initiated phase I of the project, M. Argueso & Co., Inc., for providing the wax for this study; T. Wolf, P. A. Silverstein, W. R. Fricker, and I. Al-Rabadi of Argueso for assistance with the wax injection experiments; M. Radovic and R.M. Trejo of ORNL, for conducting rheometry measurements on filled waxes at HTML/ORNL, and W.D. Porter of ORNL for conducting high temperature dilatometry measurements for 17-4PH alloy.Thanks also go to J. Snow, D. Scott, and B. Sneider of Minco, Inc., for shell investment and for embedding thermocouples within the shell; E. Hatfield for casting assistance; Z. Wu, a University of Tennessee graduate student, for obtaining the shrinkage factors from measured dimensions; J. Kovatch and R. Abramczyk of Precision Metalsmiths, Inc. (PMI), for conducting casting experiments; Allen Bransford and Mike Payne, Precision Castings of Tennessee, Inc., for providing access to their foundry; B. Schrey, of Schrey & Sons Mold Co., for providing the sprue tooling; and Jim Gardner, J.E.M. Manufacturing, for casting design, providing wax patterns for the sprue, designing and coordinating the fabrication of a test bar, and coordinating wax injection, shell making, and casting at

show abstract

Evaluation of common constitutive equations for solidifying steel

Cited by 11 publications

References 12 publications

Metallurgical Aspects of Casting High‐Manganese Steel Grades

Metallurgical Aspects of Casting High‐Manganese Steel Grades

Modeling Solidification Phenomena in the Continuous Casting of Carbon Steels

Predicting Pattern Tooling and Casting Dimensions for Investment Casting, Phase III

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