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Table of contents
I. INTRODUCTION
I.1. Brief introduction of titanium alloys
I.2. Phase transformation in titanium alloys
I.2.1. Main phase transformations in titanium alloys
I.2.2. Martensitic phase transformation
I.2.3. Phase transformation
I.2.4. Decomposition of metastable b phase
I.3. The phase transformation kinetics of titanium alloys
I.4. The aim of the present research work
II. RESEARCH SCHEME AND EXPERIMENTAL PROCEDURE
II.1. Research contents
II.2. Researching routes
II.2.1. Study of isothermal phase transformation kinetics
II.2.2. Study of the influence of heating on isothermal phase transformation
II.2.3. Study of the phase transformation kinetics during continuous cooling
II.2.4. Influence of plastic deformation of the beta metastable phase on isothermal phase transformation kinetics during aging
II.3. Experimental materials
II.3.1. Brief introduction of Ti-B19 alloy
II.3.2. Preparation of materials and samples
II.4. Experiment methods and devices
II.4.1. In-situ resistivity measurement method and device
II.4.2. High energy synchrotron X-ray diffraction
II.4.3. Other research methods
III. ISOTHERMAL PHASE TRANSFORMATION KINETICS AND MICROSTRUCTURE EVOLUTIONS OF TI-B19 ALLOY
III.1. Variations of electrical resistivity with time and further analysis method
III.1.1. Variation of electrical resistivity with time generally
III.1.2. Variations of electrical resistivity with time during isothermal treatment Phase transformations and microstructure evolutions in metastable beta titanium alloy Ti-B19
III.1.3. Method to obtained phase transformation kinetics from in-situ resistivity variations
III.2. Isothermal phase transformation kinetics
III.3. Microstructure observations
III.3.1. Initial state
III.3.2. Structure and microstructure evolutions for aging at 300~ 350oC
III.3.3. Structure and microstructure evolutions for aging at 400~ 450oC
III.3.4. Structure and microstructure evolutions for aging at 500 ~ 550oC
III.3.5. Structure and microstructure evolutions for aging at 600°C and 700°C
III.4. The design of TTT diagram for Ti-B19 alloy
III.5. Summary
IV. INFLUENCE OF HEATING RATE ON ISOTHERMAL PHASE TRANSFORMATION IN TI-B19 ALLOY
IV.1. Evolutions during the heating
IV.1.1. Variation of resistivity with temperature (time) during the heating process
IV.1.2. Variation of structure and microstructure during the heating for a heating rate of 0.1°C/s
IV.2. Evolutions during the holding step
IV.2.1. Evolutions of electrical resistivity variations
IV.2.2. Microstructures and structure obtained after isothermal holding
IV.3. Brief summary and discussion
V. EFFECT OF PLASTIC DEFORMATION ON PHASE TRANSFORMATION OF TI-B19 ALLOY DURING AGING
V.1. Resistivity variation during heating and aging processes
V.1.1. Resistivity variation in the heating range
V.1.2. Resistivity variations during holding at 500°C
V.2. Isothermal phase transformation kinetics
V.3. Influence of deformation on microstructure evolutions.
V.4. Brief Summary
VI. PHASE TRANSFORMATION OF TI-B19 ALLOY DURING CONTINUOUS COOLING
VI.1. Influence of the cooling rate on the microstructure evolution in Ti-B19 alloy
VI.2. Resistivity variations during continuous cooling
VI.3. Establishment of phase transformation kinetics functions
VI.4. Brief summary
VII. RELATIONSHIPS BETWEEN MICROSTRUCTURE AND MECHANICAL PROPERTIES OF TI-B19 ALLOY
VII.1. Mechanical characteristics of Ti-B19 alloy after solution aging
VII.2. Influences of volume fraction of precipitated phases on mechanical characteristics of Ti-B19 alloy
VII.3. Summary
CONCLUSIONS
APPENDIX
REFERENCES
