ML3008 Metallurgy of Tool Materials and Special Steels Syllabus:
ML3008 Metallurgy of Tool Materials and Special Steels Syllabus – Anna University Regulation 2021
COURSE OBJECTIVES:
The main learning objective of this course is to prepare the students for:
1. Gaining knowledge on the various types of tool materials and their characteristics and applications.
2. Distinguishing the various methods of testing tool steels.
3. Understanding thoroughly the various existing manufacturing processes, heat treatment and properties of advanced tool materials.
4. Identifying suitable heat treatments that can be adopted to the tool steels and its effect on the mechanical properties.
5. Discussing the need for coating the tool materials and its implications.
UNIT I CLASSIFICATION AND MANUFACTURE OF TOOL STEELS
Classification – AISI system, selection of tool steels from the point of view of mechanical properties, Effect of alloying elements such as W, Mo, Ni, V, Ti etc., in Tool steels, Production techniques –problems in melting – powder metallurgy route, Refining methods like VAR, ESR– forming of tool steels.
UNIT II HEAT TREATMENT OF TOOL STEELS AND DEFECTS
HEAT TREATMENT AND METALLURGY OF W, S, O, A & D TYPE TOOL STEELS Water hardening tool steels, shock resistance tool steels, cold work tool steels-oil hardening, mediumalloy and high carbon-high Cr(O,A&D types): Constitution, classification of principal types, heat treatment process, hardenability, distortion characteristics, properties and application.
HEAT TREATMENT AND METALLURGY OF H, T, M, SPECIAL PURPOSE TOOL STEELS-Hot work tool steels, high speed tool steels, maraging tool steels, special purpose tool steels: constitution, classification of principal types, heat treatment process, specific requirements and applications.
UNIT III PROPERTIES, TESTING AND FAILURE OF TOOL STEELS
Mechanical properties of Tool steels with respect to applications – Elevated temperature properties – Microstructures –Carbide distribution –Coating thickness, micro hardness – Adhesion and Scratch resistance. Tool failures – material heat treatment, manufacturing processes and Operational factors.
UNIT IV ADVANCED TOOL MATERIALS
Sintered Tungsten Carbide tools – ISO classification, Uses of P, M, K,H,W, S, O, A ,T grades Cermet – ceramics, mixed and reinforced grades –WC, Al2O3, SiC , CBN, PCD, TaC, TiC, Solid Carbide tools – Manufacturing techniques, heat treatment and properties, Stellites, Cemented carbides, ceramic tools, Special purpose tool steels.
UNIT V SURFACE TREATMENTS AND COATINGS
Sulphidizing of tool steels – TiN coating by PVD, coating of Carbide tools –Mono and multilayer Coatings of TiC, TiN, Alumina and DLC by PVD and CVD processes.
TOTAL: 45 PERIODS
COURSE OUTCOMES:
Upon completion of the course, the Students will be able to
1. Classify the various tool materials that are used for engineering applications and understand the influence of various alloying elements on the properties of tool materials
2. Select suitable heat treatment for the different tool materials inorder to improve the performance of tools.
3. Test the tool materials for various properties and analyse on the various possible failures that occur in tools.
4. Explain the need for advanced tool materials and the advantages of various special tool materials over conventional tool materials.
5. Infer the effect of coating on the tool materials and are exposed to the various possible coating techniques that are available for tool materials.
TEXT BOOKS
1. George Roberts, George Krauss, Richard Kennedy, “Tool Steels” 5th edition, ASM International,1998.
2. Payson, Peter – “Metallurgy of Tool Steels” – John Wiley & Sons, New York 1962
REFERENCES
1. Joseph R. Davies – “Tool Materials”, ASM International, 1995
2. Robert Wilson, “Metallurgy and Heat treatment of Tool Steels, McGraw Hill New York,1975