The Adhesion of CrN Thin Films Deposited on Modified 42CrMo4 Steel

Abstract

Here, the e ect of adhesion of CrN hard coatings on modi ed 42CrMo4 steel substrate is presented. Modi cations of the substrate are shot peening, nitriding, shot peening, and nitriding joined process. In the shot peening process, two variable process parameters were used: exposure time (t) and air pressure (p). e nitriding process was conducted in the following parameters: nitriding potential N p � 4.86, nitriding time t n � 3 h, and temperature process T � 530°C. Modi ed substrates were characterized by surface hardness HV5 and hardness pro les on the cross section of samples and by surface roughness parameters. On such prepared substrates, the CrN coating was deposited. e adhesion of CrN coating on modi ed substrates was de ned by the scratch test. Chemical and phase composition of the lms was determined using EDS method and X-ray di raction, respectively. e surface hardness of deposited lms was also de ned. e substrate of 42CrMo4 steel without mechanical and heat treatment coated by hard CrN lm was used as a reference.

Effect of annealing treatment on the microstructure, mechanical and tribological properties of chromium carbonitride coatings

“…In addition, they transform into chromium carbonitride by the appearance of (111) and (131) Cr 3 N 0.6 C 0.4 at 41.02°and 51.20°, respectively (cubic structure, JCPDS 01 0892540) [25][26][27][28]. This agrees well with earlier works, where carbides and carbonitrides have been successfully formed from transition-metal-nitride-based thin films deposited on high carbon steel [17,21]. XRD analysis reveals that the Cr 2 N phase is thermally stable at 1000°C which can be attributed to the presence of sufficient chromium and nitrogen in the deposited coating.…”

“…These values are close to that obtained by Ibrahim et al [4] for CrN coatings deposited by magnetron sputtering. However, the film hardness is a little bit lower than that reported in the literature (19)(20)(21)(22)(23)(24) [12,32,33]. This may be attributed to the heat produced by high energetic ion bombardment [33].…”

“…This is due to the difference in crystal structures of carbon, chromium carbide and chromium nitride. The carbon atoms can easily replace the nitrogen atoms in the chromium nitride crystal structure to form chromium carbide [21][22][23][24]. Thus, the carbon element perturbs the normal crystal arrangement of chromium nitrides.…”

Effect of the Adaptive Response on the Wear Behavior of PVD and CVD Coated Cutting Tools during Machining with Built Up Edge Formation

“…In general, the CrN coating is a good candidate for non-ferrous alloy machining because it has a very low affinity with workpieces [ 41 ]. CrN is also known to have high chemical stability, resulting in good corrosion and oxidation resistance [ 42 ], tribological properties (low coefficient of friction), and toughness [ 43 , 44 , 45 , 46 ].…”

Investigation of the Wear Behavior of PVD Coated Carbide Tools during Ti6Al4V Machining with Intensive Built Up Edge Formation

“…For machining applications with intensive BUE formation, the coating's lubricity [6] becomes a significant factor in determining its overall performance. A CrN coating is generally used to machine nonferrous alloys due to its low chemical affinity with nonferrous materials [18]. CrN is known for its high chemical stability, good corrosion and oxidation resistance [19], improved toughness, and lower friction coefficient [20][21][22][23].…”