TY - JOUR

T1 - Influence of Residual Stresses in heat-treated High-Speed Steels on the Adhesion of CrAlN Coatings

AU - Denkena, Berend

AU - Breidenstein, Bernd

AU - Lucas, Henning

AU - Keitel, Michael

AU - Tillmann, Wolfgang

AU - Stangier, Dominic

N1 - Funding information: The authors gratefully acknowledge the financial support of the German Research Foundation (DFG) within the transregional collaborative research center TR73 “Manufacturing of complex functional components with variants by using a new sheet metal forming process – Sheet Bulk Metal Forming”. This work is a cooperation of the subprojects B5 (Application of nanostructured bionic thin layers to enhance the wear and friction behavior of forming tools by thin-walled sheet forming) and B8 (Grinding strategies for local and stress orientated subsurface-modification of sheet-bulk metal forming tools).

PY - 2020/6/8

Y1 - 2020/6/8

N2 - The influence of different mechanical and chemical pre-treatments for heat-treated AISI M3:2 tool steel (∼ DIN S 6-5-3) on the coating adhesion of a CrAlN coating is investigated. Surface topography and residual stresses before and after the PVD coating process are examined. Nitriding and grinding with toric grinding pins results in compressive residual stresses in the subsurface, whereas polishing leads to tensile stresses. After the deposition process a decrease of the residual stresses in the substrate material is observed, whereas the stresses in the nitrided surface are not affected. The resulting residual stresses and roughness profiles are correlated with the adhesion of the PVD coating showing a clear dependency on the substrate pre-treatments. Additionally, interactions between the residual stresses in the subsurface and the resulting stress gradient in the PVD coating could be determined by depth profiles. Based on these findings an optimized grinding process can therefore make the additional process step of nitriding obsolete and can provide an improved coating adhesion for an enhanced wear resistance.

AB - The influence of different mechanical and chemical pre-treatments for heat-treated AISI M3:2 tool steel (∼ DIN S 6-5-3) on the coating adhesion of a CrAlN coating is investigated. Surface topography and residual stresses before and after the PVD coating process are examined. Nitriding and grinding with toric grinding pins results in compressive residual stresses in the subsurface, whereas polishing leads to tensile stresses. After the deposition process a decrease of the residual stresses in the substrate material is observed, whereas the stresses in the nitrided surface are not affected. The resulting residual stresses and roughness profiles are correlated with the adhesion of the PVD coating showing a clear dependency on the substrate pre-treatments. Additionally, interactions between the residual stresses in the subsurface and the resulting stress gradient in the PVD coating could be determined by depth profiles. Based on these findings an optimized grinding process can therefore make the additional process step of nitriding obsolete and can provide an improved coating adhesion for an enhanced wear resistance.

KW - Coating adhesion

KW - Heat-treated

KW - High-speed steel

KW - Mechanical pretreatment

KW - PVD-coating

KW - Residual stresses

KW - Surface integrity

UR - http://www.scopus.com/inward/record.url?scp=85091184173&partnerID=8YFLogxK

U2 - 10.3139/105.110413

DO - 10.3139/105.110413

M3 - Article

AN - SCOPUS:85091184173

VL - 75

SP - 163

EP - 176

JO - HTM - Journal of Heat Treatment and Materials

JF - HTM - Journal of Heat Treatment and Materials

SN - 1867-2493

IS - 3

ER -