Experimental Characterisation of Tool Hardness Evolution Under Consideration of Process Relevant Cyclic Thermal and Mechanical Loading During Industrial Forging

authored by: F. Müller, I. Malik, H. Wester, B. A. Behrens
Abstract: The near-surface layer of forging tools is repeatedly exposed to high thermal and mechanical loading during industrial use. For the assessment of wear resistance of tool steels, in previous work thermal cyclic loading tests were carried out to investigate changes in hardness. However, actual results of time-temperature-austenitisation (TTA) tests with mechanical stress superposition demonstrated a distinct reduction of the austenitisation start temperature indicating a change in the occurence of tempering and martensitc re-hardening effects during forging. Therefore, the superposition of a mechanical compression stress to the thermal cyclic loading experiments is of high interest. Tests are carried out in this study to analyse hardness evolution of the tool steel H11 (1.2343) under consideration of forging process conditions. The results show that the application of compression stresses on the specimen during the temperature cycles is able to restrict tempering effects while increasing the amount of martensitic re-hardening.
Organisation(s): Institute of Metal Forming and Metal Forming Machines
Type: Contribution to book/anthology
Pages: 3-12
No. of pages: 10
Publication date: 2021
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Industrial and Manufacturing Engineering, Economics, Econometrics and Finance (miscellaneous), Safety, Risk, Reliability and Quality
Electronic version(s): https://doi.org/10.1007/978-3-662-62138-7_1 (Access: Closed)
: Details in the research portal "Research@Leibniz University"

BibTeX

@inbook{fa2136e0a6174590b477646fe887c1de,
title = "Experimental Characterisation of Tool Hardness Evolution Under Consideration of Process Relevant Cyclic Thermal and Mechanical Loading During Industrial Forging",
abstract = "The near-surface layer of forging tools is repeatedly exposed to high thermal and mechanical loading during industrial use. For the assessment of wear resistance of tool steels, in previous work thermal cyclic loading tests were carried out to investigate changes in hardness. However, actual results of time-temperature-austenitisation (TTA) tests with mechanical stress superposition demonstrated a distinct reduction of the austenitisation start temperature indicating a change in the occurence of tempering and martensitc re-hardening effects during forging. Therefore, the superposition of a mechanical compression stress to the thermal cyclic loading experiments is of high interest. Tests are carried out in this study to analyse hardness evolution of the tool steel H11 (1.2343) under consideration of forging process conditions. The results show that the application of compression stresses on the specimen during the temperature cycles is able to restrict tempering effects while increasing the amount of martensitic re-hardening.",
keywords = "Forging, Martensitic re-hardening, Phase transformation, Tempering, Tool hardness, Wear estimation",
author = "F. M{\"u}ller and I. Malik and H. Wester and Behrens, {B. A.}",
note = "Funding Information: Acknowledgements. The authors gratefully acknowledge the support of the German Research Foundation (Deutsche Forschungsgemeinschaft - DFG) and the German Federation of Industrial Research Associations (AiF) within the projects DFG 397768783 and AiF 19647 for this research work.",
year = "2021",
doi = "10.1007/978-3-662-62138-7_1",
language = "English",
isbn = "978-3-662-62137-0",
series = "Lecture Notes in Production Engineering",
publisher = "Springer Nature",
pages = "3--12",
booktitle = "Lecture Notes in Production Engineering",
address = "United States",
}