Optimization of Composition and Heat Treating of Die Steels for Extended Lifetime Page: 3 of 121
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PART 1: EFFECT OF COMPOSITION 2
1.0 INTRODUCTION 4
1.1 Background 4
1.2 Die Casting Die Materials 5
1.3 Die Casting Failure Modes 9
1.4 Thermal Stress and Mechanisms of Thermal Fatigue 11
1.5 Thermal Fatigue Resistance and Other Properties Required of
Die Steels 13
2.0 MATERIALS AND PROCEDURES 15
2.1 Materials 15
2.2 Thermal Fatigue Test 17
2.3 Heat Treatment Procedure 20
2.4 Scanning Electron Microscopy 20
3.0 RESULTS AND DISCUSSION 20
3.1 Thermal Fatigue Resistance of Five Steels 20
3.2 Cracking Pattern 23
3.3 Effect of Tempering on the Microstructure and Hardness of the
Five Steels 26
4.0 CONCLUSIONS 30
5.0 BIBLIOGRAPHY 32
PART 2: EFFECT OF HEAT TREATING 35
6.0 OIL QUENCHING OF DIES 35
6.1 Objectives 35
6.2 Experimental 36
6.3 Results and Discussion 43
7.0 IN-PLANT EVALUATION OF DIES 46
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Schwam, David; Wallace, John F. & Zhou, Quanyou. Optimization of Composition and Heat Treating of Die Steels for Extended Lifetime, report, January 30, 2002; United States. (digital.library.unt.edu/ark:/67531/metadc742078/m1/3/: accessed July 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.