کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1657137 1517614 2015 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Substrate surface finish effects on scratch resistance and failure mechanisms of TiN-coated hardmetals
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
Substrate surface finish effects on scratch resistance and failure mechanisms of TiN-coated hardmetals
چکیده انگلیسی


• Scratch-induced damage scenario is clearly dependent on surface finish condition.
• Adhesive failure in ground substrates is related to compressive residual stresses.
• Scratch response depends on relative scratch–grinding groove orientations.

In this study, the influence of substrate surface finish on scratch resistance and associated failure mechanisms is investigated in the case of a TiN-coated hardmetal. Three different surface finish conditions are studied: as-sintered (AS), ground (G), and mirror-like polished (P). For G conditioned samples, scratch tests are conducted both parallel and perpendicular to the direction of the grinding grooves. It is found that coated AS, G and P samples exhibit similar critical load for initial substrate exposure and the same brittle adhesive failure mode. However, the damage scenarios are different, i.e. the substrate exposure is discrete and localized to the scratch tracks for G samples while a more pronounced and continuous exposure is seen for AS and P ones. Aiming to understand the role played by the grinding-induced compressive residual stresses, the study is extended to coated systems where ground substrates are thermal annealed (for relieving stresses) before being ion etched and coated. It yielded lower critical loads and changes in the mechanisms for the scratch-related failure; the latter depending on the relative orientation between scratching and grinding directions.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface and Coatings Technology - Volume 265, 15 March 2015, Pages 174–184
نویسندگان
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