Substrate dependent cracking behavior of CrAlN coatings

IF 0.4 Q4 ENGINEERING, MECHANICAL

Vakuum in Forschung und Praxis Pub Date : 2023-11-21 DOI:10.1002/vipr.202300809

K. Bobzin, C. Kalscheuer, Muhammad Tayyab

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Abstract

The present study investigated the effect of substrate deformation behavior on crack resistance of CrAlN coatings under quasi‐static and cyclic loads using nanoindentation. (Cr47Al53)N coatings were deposited on cemented carbide WC‐Co and high‐speed steel HS652C substrates through physical vapor deposition (PVD) und characterized. In order to study the coating cracking behavior, the coated substrates were subjected to quasi‐static nanoindentations with indentation force Fmax = 1 N, Fmax = 1.5 N and Fmax = 2 N. Moreover, the crack resistance under cyclic loading with frequency f = 0.16 Hz was analyzed at F = 1 N and F = 1.5 N after n = 900 cycles. A conical diamond indenter was used for the tests. At the end, the indentation imprints were analyzed by scanning electron microscopy (SEM). The substrate dependency was apparent in cracking behavior of the coating. Albeit the lower indentation depth compared to the variant with HS6‐5‐2C substrate, the CrAlN coating on WC‐Co substrate showed surface cracks under quasi‐static and cyclic loading. These cracks on the coated surface were absent in the variant with HS6‐5‐2C substrate. This could be related to higher resistance of cemented carbide substrates against plastic deformation, prompting earlier crack initiation in CrAlN coating for effective energy dissipation during indentation.

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CrAlN 涂层的基底开裂行为

本研究利用纳米压痕法研究了基体变形行为对准静态和循环载荷下 CrAlN 涂层抗裂性的影响。(通过物理气相沉积（PVD）在硬质合金 WC-Co 和高速钢 HS652C 基体上沉积了 (Cr47Al53)N 涂层，并对其进行了表征。为了研究涂层的开裂行为，对涂层基底进行了准静态纳米压痕试验，压痕力 Fmax = 1 N、Fmax = 1.5 N 和 Fmax = 2 N。测试使用的是锥形金刚石压头。最后，用扫描电子显微镜（SEM）对压痕进行分析。涂层的开裂行为明显与基材有关。尽管与使用 HS6-5-2C 基材的变体相比压痕深度较小，但在准静态和循环加载下，WC-Co 基材上的 CrAlN 涂层出现了表面裂纹。而使用 HS6-5-2C 基体的变体在涂层表面没有出现这些裂纹。这可能与硬质合金基体抗塑性变形的能力较强有关，促使 CrAlN 涂层更早出现裂纹，从而在压痕过程中有效消散能量。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Vakuum in Forschung und Praxis ENGINEERING, MECHANICAL-

CiteScore

0.30

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0.00%

发文量

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