Thermal damage of conventional hard chromium coatings on 416 stainless steel

被引：10

作者：

Almotairi, Abdullah ^{[1
]}

Farhat, Zoheir ^{[2
]}

Warkentin, Andrew ^{[1
]}

机构：

[1] Dalhousie Univ, Dept Mech Engn, Halifax, NS B3H 4R2, Canada

[2] Dalhousie Univ, Dept Proc Engn & Appl Sci, Halifax, NS B3J 2X4, Canada

来源：

ENGINEERING FAILURE ANALYSIS | 2019年 / 105卷

基金：

加拿大自然科学与工程研究理事会;

关键词：

Thermal damage; Indentation damage; Hard chromium; Residual stress; Crack formation; BRITTLE COATINGS; INDENTATION; FRACTURE; CERAMICS;

D O I：

10.1016/j.engfailanal.2019.07.007

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Hard chromium coatings have a wide range of application due to their resistance to corrosion and wear. In the present work, chromium was commercially electroplated on 416 stainless steel. Thermal damage of the chromium coatings was investigated as a function of heating temperature and cooling rate. Specimens were heated to various temperatures and then cooled down either by air cooling or water quenching. An optical microscope was employed to assess the damage due to heating. No thermally-induced cracks were observed for specimens heated up to 600 degrees C. At 800 degrees C and higher, thermally-induced cracks were observed and increased with increasing temperature. Cracks generated during heating were likely due to thermal expansion coefficient mismatch between the coating and the substrate. Heating was found to significantly alter the residual stresses state in the coating. Residual stress increased when heated to 600 degrees C and dropped at 1000 degrees C. Spherical indentations were employed to evaluation the effects of heating on the mechanical damage of the coatings. Ring, cone, surface radial and radial bend cracks were observed on as-deposited and heated specimens up to 600 degrees C. Specimen heated up to 800 degrees C showed partially developed ring and radial bend cracks, while specimen heated up to 1000 degrees C displayed no indentation related cracks.

引用

页码：1118 / 1130

页数：13

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