TY - JOUR

T1 - Layer Approach to Model Fatigue Strength of Surface-Hardened Components

AU - Dobberke, Dénes

AU - Leitner, Martin

AU - Wiebesiek, Jens

AU - Fröschl, Jürgen

N1 - Publisher Copyright: © 2024 by the authors.

PY - 2024/7

Y1 - 2024/7

N2 - This paper deals with a surface-hardened forged steel that is commonly used for powertrain components like gears, axles or crankshafts. In order to increase static and fatigue strength and to minimise wear, surface treatments like induction hardening lead to a significant microstructural change within heat-affected zones. The aim of this study was to elaborate a method for a reliable computational estimation of the local fatigue strength by considering local material properties. The method is based on experimental test results, where specimens were extracted from forged crankshafts and further heat-treated to investigate the fatigue strength of the unhardened and hardened material condition. The experimental test data were fundamental in defining elaborated Haigh diagrams, enabling a more reliable local fatigue assessment. The comparison of the component safety within the fatigue strength verification for a crankshaft section under alternate bending resulted in (Formula presented.) -more progressive dimensioning of surface hardened layers.

AB - This paper deals with a surface-hardened forged steel that is commonly used for powertrain components like gears, axles or crankshafts. In order to increase static and fatigue strength and to minimise wear, surface treatments like induction hardening lead to a significant microstructural change within heat-affected zones. The aim of this study was to elaborate a method for a reliable computational estimation of the local fatigue strength by considering local material properties. The method is based on experimental test results, where specimens were extracted from forged crankshafts and further heat-treated to investigate the fatigue strength of the unhardened and hardened material condition. The experimental test data were fundamental in defining elaborated Haigh diagrams, enabling a more reliable local fatigue assessment. The comparison of the component safety within the fatigue strength verification for a crankshaft section under alternate bending resulted in (Formula presented.) -more progressive dimensioning of surface hardened layers.

KW - fatigue strength

KW - mean stress effect

KW - surface hardening

UR - http://www.scopus.com/inward/record.url?scp=85199598137&partnerID=8YFLogxK

U2 - 10.3390/met14070754

DO - 10.3390/met14070754

M3 - Article

AN - SCOPUS:85199598137

VL - 14.2024

JO - Metals

JF - Metals

SN - 2075-4701

IS - 7

M1 - 754

ER -