Numerical and experimental investigations for hot metal gas forming of stainless steel X2CrTiNb18

Reuther, Franz; Mosel, André; Freytag, P.; Lambarri, Jon; Degenkolb, Lars; Werner, Markus; Winter, Sven

doi:10.1016/j.promfg.2018.12.052

Cited by 11 publications

(5 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The conceivable approach of testing the initial flat sheet product (prior to tube forming) does not take into account the subsequent raw forming process, including the substantial effects on microstructure and thus on material properties. These limitations in the material testing of tubes results in a somewhat imprecise simulation of tube forming processes [3]. The potential of a simulation-based process design therefore cannot be fully exploited.…”

Section: Introductionmentioning

confidence: 99%

“…To accurately model the hydroforming process, particular attention must be paid to this discontinuous strain rate character, because the forming speed can significantly influence the flow stresses of metallic materials (via the strain rate sensitivity m) [5]. The strain rate sensitivity of different materials is usually determined under pure uniaxial tensile loading and can subsequently be represented by implementing strain-rate-dependent yield curve approaches in the material modeling [3]. The use of quasistatic material models without rate dependence often results in unrealistically large plastic strains of individual element series in the simulation of hydroforming and, moreover, in premature localization and incorrect crack prediction.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical and Experimental Investigations on Tube Section Flattening for Parameter Identification and Advanced Material Modeling of Tubes

Reuther

Winter

Fritsch

et al. 2023

JMMP

View full text Add to dashboard Cite

At present, there are no experimental methods that allow for the complete direction-dependent mechanical characterization of tubes. This considerably limits the parameterization of complex, anisotropic material models. The present study introduces a new approach to overcome these limitations: tube sections are first flattened into a planar geometry; then, samples for uniaxial testing are taken out of the flattened tube section and used for parameter identification. In this paper, special emphasis is placed on the intermediate step of flattening, which is investigated in detail both numerically and experimentally. Flattening by pressing is identified as the most advantageous of several options, and the procedure is optimized by numerical simulations that address springback compensation. Experimental validation is performed on tubes (steel E235) with a diameter of 60 mm and an average wall thickness of 1.524 mm. Tube sections are successfully flattened in a custom-built tool with only small remaining out-of-plane displacements after flattening. The numerically predicted pressing force curves agree very well with the experimental data.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Investigations on Tube Section Flattening for Parameter Identification and Advanced Material Modeling of Tubes

Reuther

Winter

Fritsch

et al. 2023

JMMP

View full text Add to dashboard Cite

show abstract

“…For high-temperature service up to 900 °C, steels with high Cr-contents of about 18 wt. %, such as X2CrTiNb18, are used [7,8], since they have a better resistance to scaling [9]. Furthermore, alloying with this amount of Cr leads to fully ferritic microstructure without phase transformation during cooling, which is advantageous for distortion-free cooling after forging.…”

Section: Introductionmentioning

confidence: 99%

On the Impact of the Intermetallic Fe2Nb Laves Phase on the Mechanical Properties of Fe-6 Al-1.25 Nb-X W/Mo Fully Ferritic Light-Weight Steels

Emmrich

Krupp

2021

Metals

View full text Add to dashboard Cite

The present study aims at the development of precipitation hardening fully ferritic steels with increased aluminum and niobium content for application at elevated temperatures. The first and second material batch were alloyed with tungsten or molybdenum, respectively. To analyze the influence of these elements on the thermally induced precipitation of the intermetallic Fe2Nb Laves phase and thus on the mechanical properties, aging treatments with varying temperature and holding time are performed followed by X-ray diffraction (XRD) analysis and scanning electron microscopy (SEM) including elemental contrast based particle analysis as well as hardness measurements and tensile tests at room temperature and at 500 °C. The incorporation of molybdenum into the Laves phase sets in at an earlier stage of aging than the incorporation of tungsten, which leads to faster growth and coarsening of the Laves phase in the molybdenum-alloyed steel. Nevertheless, both concepts show a fast and massive increase in hardness (280 HV10) due to precipitation of Laves phase during aging at 650 °C. After 4 h aging, the yield strength increase at room temperature is 100 MPa, which stays stable at operation temperatures up to 500 °C.

show abstract

“…This material is widely used in automotive for parts in the exhaust system, e.g. inlet-/outlet tubes of catalysts and filters [25]. Novel trends showed that high-frequency welding could be used as a joining process for these applications [26,27].…”

Section: Introductionmentioning

confidence: 99%

Influence of Tack Welds Distribution and Welding Sequence on the Angular Distortion of Tig Welded Joint

Tomków

Sobota²,

Krajewski

2020

FU Mech Eng

View full text Add to dashboard Cite

In this paper the influence of tack welds distribution and welding sequence on angular distortion of the Tungsten Inert Gas (TIG) welded joint was tested. Additionally, the effect of welding current on angular distortion was assessed. For research X2CrTiNb18 (AISI 441) stainless steel (2.5 mm thick) was chosen. During research specimens were prepared with different distributions of tack welds. Then they were welded by different welding sequences with the use of different welding current values. After welding the angular distortion of each specimen was measured by using the coordinate measuring machine. In the next step specimens were cut. Cross-sections were polished and the metallographic macroscopic testing was conducted to check the geometry of performed welds. Performed experiments allowed determining the optimal tack weld sequence and welding parameters for welding thin stainless steel sheets.

show abstract

Numerical and experimental investigations for hot metal gas forming of stainless steel X2CrTiNb18

Cited by 11 publications

References 4 publications

Numerical and Experimental Investigations on Tube Section Flattening for Parameter Identification and Advanced Material Modeling of Tubes

Numerical and Experimental Investigations on Tube Section Flattening for Parameter Identification and Advanced Material Modeling of Tubes

On the Impact of the Intermetallic Fe2Nb Laves Phase on the Mechanical Properties of Fe-6 Al-1.25 Nb-X W/Mo Fully Ferritic Light-Weight Steels

Influence of Tack Welds Distribution and Welding Sequence on the Angular Distortion of Tig Welded Joint

Contact Info

Product

Resources

About