Temperature dependence of plastic flow, anisotropy and ductile fracture

Junhe Lian*, Wenqi Liu, Yannik Sparrer, Fuhui Shen, Sebastian Münstermann

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

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Abstract

As one of the most common extrinsic features, temperature has an essential impact on the mechanical properties as well as the controlling mechanisms of materials. Therefore, it is aimed in this study to investigate the effect of temperature on the mechanical properties of several steels in an extensive temperature range from -150 °C to 300 °C. Three basic and essential mechanical properties are considered, the plastic flow behavior, anisotropy, and ductile fracture behavior. The temperature influence on plastic flow behavior has been well studied in the literature. With this broad temperature range in the current study, we intend to create a large database to characterize the material behavior as well as to reveal the deformation mechanism change from low to high temperatures. Except for the typical dislocation slipping, the other possible involved mechanisms are twinning and dynamic strain aging. In addition to this, we are particularly focusing on the temperature effect on anisotropy, which has been not covered yet by the existing literature. Based on the experimental results for two pipeline steels, it is shown that the temperature effect on anisotropy could be negligible or significant, depending on the materials. There have been also many investigations of the effect of strain rates on the ductile fracture; however, the temperature effect has not received obvious attention yet. In this study, we set the scope to quasi-static loading condition but vary the loading temperature from -50 °C to 300 °C. The stress-state influence under these temperatures is also considered by employing various sample geometries. Two automotive steel sheets are employed for this study and the results show that a strong temperature effect on the ductile fracture exists for the elevated temperature mainly due to the dynamic strain aging effect, while the less pronounced but non-negligible effect of the temperature is revealed for the lowered temperatures.

Original languageEnglish
Title of host publication23rd International Conference on Material Forming (ESAFORM 2020)
PublisherElsevier
Pages1308-1313
Number of pages6
Volume47
DOIs
Publication statusPublished - 1 Jan 2020
MoE publication typeA4 Article in a conference publication
EventInternational ESAFORM Conference on Material Forming - Cottbus, Germany
Duration: 4 May 20208 May 2020
Conference number: 23

Publication series

NameProcedia Manufacturing
PublisherElsevier BV
ISSN (Print)2351-9789

Conference

ConferenceInternational ESAFORM Conference on Material Forming
Abbreviated titleESAFORM
CountryGermany
CityCottbus
Period04/05/202008/05/2020

Keywords

  • Blue brittleness
  • Dual-phase steels
  • Dynamic strain aging
  • Pipeline steels
  • Stress state dependency

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    Lian, J., Liu, W., Sparrer, Y., Shen, F., & Münstermann, S. (2020). Temperature dependence of plastic flow, anisotropy and ductile fracture. In 23rd International Conference on Material Forming (ESAFORM 2020) (Vol. 47, pp. 1308-1313). (Procedia Manufacturing). Elsevier. https://doi.org/10.1016/j.promfg.2020.04.247