Tempering and wear resistance of laser cladded MMC coating for corrugated rollers

Abstract

Corrugated rolls are the core and expensive components in the production line of corrugated cardboard. Severe abrasion of the paper during production usually results in early failure of the rolls to deteriorate the quality of the cardboard. To increase the wear resistance is of important technological and economic meaning. Laser cladding is an effective way to achieve high quality coating on expensive component to have excellent wear resistance.Previous research indicates that laser cladded particulate reinforced metal matrix composite coating on corrugated roller can achieve high hardness up to HRC 63. However the roller works at a temperature around 200°C, the various metastable phases by rapid solidification during laser cladding may be tempered, which leads to a change in microstructure and then decrease of hardness and wear resistance. The paper focus on the influence of wear resistance of the particulate reinforced MMC coatings after tempering.The cladded layer shows a hypoeutectic structure consisted of proeutectic austenite dendrites and eutectic matrix in addition to a large amount of composite carbides precipitated in situ during solidification and homogeneous distributed in the metal matrix. The hardness of the coating is about 770HV0.2. Both the hardness and wear resistance of the coating improves at 200°C, which is the working temperature of the corrugated rolls. The particulate reinforced metal matrix composite coatings show good dry abrasive wear resistance. The proportion of uniformly distributed hard phase has important effect on the wear resistance.Corrugated rolls are the core and expensive components in the production line of corrugated cardboard. Severe abrasion of the paper during production usually results in early failure of the rolls to deteriorate the quality of the cardboard. To increase the wear resistance is of important technological and economic meaning. Laser cladding is an effective way to achieve high quality coating on expensive component to have excellent wear resistance.Previous research indicates that laser cladded particulate reinforced metal matrix composite coating on corrugated roller can achieve high hardness up to HRC 63. However the roller works at a temperature around 200°C, the various metastable phases by rapid solidification during laser cladding may be tempered, which leads to a change in microstructure and then decrease of hardness and wear resistance. The paper focus on the influence of wear resistance of the particulate reinforced MMC coatings after tempering.The cladded layer shows a hypoeutectic structure consist...