International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 04 Issue: 05 | May -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 1146 ANALYSIS OF WEAR BEHAVIOR OF D6 TOOL STEEL BY INFLUENCE OF CRYOGENIC TREATMENT R.H.Naravade 1 , A.P.Aher 2 1 Lecturer in Mechanical Engineering Department, P.Dr.V.V.Patil Polytechnic Loni, Maharashtra, India 2 Sr.Lecturer in Mechanical Engineering Department, P.Dr.V.V.Patil Polytechnic Loni, Maharashtra, India ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - In Present work, the special effects of cryogenic treatment on the wear performance of D6 tool steel are noted. For present work, : -63` C as shallow cryogenic temperature and -185`C as deep cryogenic temperature are used. The special effects of temperature (deep & Shallow, time (at 20 and 40 h) on the wear performance of D6 tool steel are studied. Wear tests are performed using a pin-on-disk wear tester to which different loads & velocities are applied. The results show that the treatments decrease the retained austenite and hence get better the wear hardness & resistance. Due to more homogenized carbide allocation as well as the exclusion of the retained austenite, the profound cryogenic action demonstrated more enhancement in wear resistance & hardness weigh against with the shallow cryogenic treatment. By increasing the custody time at temperatures, supplementary retained austenite is transformed addicted to martensite; thus, the wear resistance is enhanced and further hardness are observed. The blend of heat treatment has to be optimised. For that reason DoE is performed. The DOE is done with minitab 16. Developed optimum runs with help of RSM by Box-Behnken design. Key Words: D6 tool steel, cryogenic treatment (CT), wear behaviour, DOE, RSM 1. INTRODUCTION Tribology is the study of the friction, wear and lubrication deals with engineering surfaces with understanding surface interfaces in detail and then proposing improvements for specific applications. One of the important objectives in tribology is to regulate magnitude of frictional forces per the requirement of minimum or maximum frictional force in application. To regulate the fictional force we should understand the fundamentals of frictional process and should obtain for all conditions of sliding velocity, temperature, surface finish and material properties. Years of research in tribology explains the friction and wear properties of a given material are not its intrinsic properties, but governed by on many factors correlated to a specific application. Quantitative values for friction and wear in the forms of wear rate and coefficient of friction governed by the following basic group parameters:  The structure of the system, i.e. its components and their relevant properties;  The operating variables, i.e. temperature, load (stress), time and kinematics;  Mutual interface of the system components. 2. AISI D6 TOOL STEEL Tool steels are urbanized to resist wear at temperatures of forming as well as cutting applications. Tool steel is used on a ample range of applications where wear resistance, toughness and other properties are noted for optimal performance. They are mostly alienated into six categories: high speed, cold and hot work, shock resisting, mould and special function tool steels [1]. Commonly, many more tool steels accomplish the requirements for a certain application, so final selection is directed by considering the tool life, cost of material and fabrication. Practical factor affecting the tool life is adhesion wear [1]. Even if the high abrasion resistance of D6 tool steels is pleasing for cold-work applications, turning and milling operations during manufacturing of finished dies and moulds are complicated. 3. APPLICATIONS OF D6 TOOL STEEL Forming rolls, Measuring tools, slitting cutters, master tools, blanking, thread rolling, forming, extrusion, drawing lamination , coining dies ,heading tools, edging rolls, beading rolls, intricate punches, long punches, decorative knives, spinning tools, mill rolls, moulds for pressing abrasive powders, hunting knives, etc. 4. LITERATURE REVIEW In tool steels, after the conventional heat-treatment a low percentage of austenite is retained and noted as ‘‘retained austenitedz. Due to the retained austenite in soft phase could reduce the product life in steels and, can be transformed into martensite in working conditions. The transformed martensite may cause numerous problems in working tools. Bourithis et.al [1] studied AISI D2 and O1 i.e. commercial cold work tool steels. The above said tool steels was given heat treatment in order to obtain the same hardness 700VHN i.e. 60 HRC and consequently tested in three different modes of wear, namely in adhesion, three-body and two-body abrasion, by using pin-on-disk, dry sand/rubber wheel apparatus and pin abrasion on SiC, respectively.