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Transfer of ausforming parameters to scaled forging tools

Research output: Chapter in book/report/conference proceedingConference contributionResearchpeer review

Authors

  • Bernd Arno Behrens
  • Kai Brunotte
  • Tom Petersen
  • Roman Relge
  • Michael Till

Details

Original languageEnglish
Title of host publicationMETAL 2021 - 30th Anniversary International Conference on Metallurgy and Materials, Conference Proceedings
Pages247-252
Number of pages6
ISBN (electronic)9788087294994
Publication statusPublished - 15 Sept 2021
Event30th International Conference on Metallurgy and Materials, METAL 2021 - Brno, Virtual, Czech Republic
Duration: 26 May 202128 May 2021

Abstract

Forging tools are exposed to cyclically changing thermo-mechanical stress conditions leading to its failure. Damage phenomena on the tool engraving cannot be entirely avoided by hardening the surface, as this leads to a more brittle behaviour and thus to lower ductility of the material, which can intensify the occurring damage effects. The forming of steel below the recrystallisation temperature in the metastable austenite area, known as ausforming, offers the possibility to increase strength and hardness without affecting ductile properties, due to simultaneous grain refinement. In this study, ausforming was used to produce forging dies with increased wear resistance from tool steel X37CrMoV5-1 (AISI H11) by achieving higher hardness in the surface area while maintaining a ductile base material. Suitable forming and tempering parameters were derived from previous studies in which ausformed cups from tool steel X37CrMoV5-1 (AISI H11) with a downscaled geometry have been investigated in mechanical pulsation tests. To achieve comparable properties, a process route with adapted surface-cooling conditions, a global true plastic strain of φ = 0.25 and a tempering temperature of 300 °C were applied. Further, the ausformed dies were compared with conventionally forged dies. The metallographic analysis and hardness measurements show that an increased hardness in the surface area can also be obtained for the actual formed dies. In order to see the influence of the thermomechanical alternating load on the die engraving under forging conditions, the performance of the ausformed tool will be investigated in service-life-time tests and compared to warm-formed and machined reference tools.

Keywords

    Ausforming, Forging die inserts, Metastable austenite, Wear resistance

ASJC Scopus subject areas

Cite this

Transfer of ausforming parameters to scaled forging tools. / Behrens, Bernd Arno; Brunotte, Kai; Petersen, Tom et al.
METAL 2021 - 30th Anniversary International Conference on Metallurgy and Materials, Conference Proceedings. 2021. p. 247-252.

Research output: Chapter in book/report/conference proceedingConference contributionResearchpeer review

Behrens, BA, Brunotte, K, Petersen, T, Relge, R & Till, M 2021, Transfer of ausforming parameters to scaled forging tools. in METAL 2021 - 30th Anniversary International Conference on Metallurgy and Materials, Conference Proceedings. pp. 247-252, 30th International Conference on Metallurgy and Materials, METAL 2021, Brno, Virtual, Czech Republic, 26 May 2021. https://doi.org/10.37904/metal.2021.4118
Behrens, B. A., Brunotte, K., Petersen, T., Relge, R., & Till, M. (2021). Transfer of ausforming parameters to scaled forging tools. In METAL 2021 - 30th Anniversary International Conference on Metallurgy and Materials, Conference Proceedings (pp. 247-252) https://doi.org/10.37904/metal.2021.4118
Behrens BA, Brunotte K, Petersen T, Relge R, Till M. Transfer of ausforming parameters to scaled forging tools. In METAL 2021 - 30th Anniversary International Conference on Metallurgy and Materials, Conference Proceedings. 2021. p. 247-252 doi: 10.37904/metal.2021.4118
Behrens, Bernd Arno ; Brunotte, Kai ; Petersen, Tom et al. / Transfer of ausforming parameters to scaled forging tools. METAL 2021 - 30th Anniversary International Conference on Metallurgy and Materials, Conference Proceedings. 2021. pp. 247-252
Download
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abstract = "Forging tools are exposed to cyclically changing thermo-mechanical stress conditions leading to its failure. Damage phenomena on the tool engraving cannot be entirely avoided by hardening the surface, as this leads to a more brittle behaviour and thus to lower ductility of the material, which can intensify the occurring damage effects. The forming of steel below the recrystallisation temperature in the metastable austenite area, known as ausforming, offers the possibility to increase strength and hardness without affecting ductile properties, due to simultaneous grain refinement. In this study, ausforming was used to produce forging dies with increased wear resistance from tool steel X37CrMoV5-1 (AISI H11) by achieving higher hardness in the surface area while maintaining a ductile base material. Suitable forming and tempering parameters were derived from previous studies in which ausformed cups from tool steel X37CrMoV5-1 (AISI H11) with a downscaled geometry have been investigated in mechanical pulsation tests. To achieve comparable properties, a process route with adapted surface-cooling conditions, a global true plastic strain of φ = 0.25 and a tempering temperature of 300 °C were applied. Further, the ausformed dies were compared with conventionally forged dies. The metallographic analysis and hardness measurements show that an increased hardness in the surface area can also be obtained for the actual formed dies. In order to see the influence of the thermomechanical alternating load on the die engraving under forging conditions, the performance of the ausformed tool will be investigated in service-life-time tests and compared to warm-formed and machined reference tools.",
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AU - Brunotte, Kai

AU - Petersen, Tom

AU - Relge, Roman

AU - Till, Michael

N1 - Funding Information: The authors would like to thank the German Research Foundation (DFG) for the financial support of the project (Project-Nr. 318628894)

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ER -

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