Background
Titanium alloy has the advantages of low density, high strength, high-temperature resistance, and good corrosion resistance, and has been widely used in the aerospace field. Titanium and titanium alloy products are widely used in aerospace, compressor disks and blades, aircraft parts, fasteners, chemical equipment, automotive connecting rods, heat exchangers, and implants.
Test Conditions
The titanium alloy is heated to 1020 deg C, 950 deg C, and 850 deg C and cooled at different cooling rates. Its room temperature mechanical properties are shown in the table below.
Room Temperature Mechanical Properties
| No. | Heating temperature and cooling method | Tensile strength Rm (MPa) | Elongation A (%) | Area reduction Z (%) |
|---|---|---|---|---|
| A | 1020 deg C, water quenching | 1098 | 6 | 8 |
| B | 1020 deg C, air cooling | 1005 | 9 | 13.5 |
| C | 1020 deg C, furnace cooling | 960 | 12 | 22.5 |
| D | 950 deg C, water quenching | 1035 | 17 | 61.5 |
| E | 950 deg C, air cooling | 919 | 20 | 50 |
| F | 950 deg C, furnace cooling | 902 | 21 | 48 |
| G | 850 deg C, water quenching | 976 | 18 | 49 |
| H | 850 deg C, air cooling | 951 | 18 | 49 |
Values are test data from the referenced heat-treatment study; actual values depend on the specific heat treatment and product form.
Interpretation
Higher heating temperatures combined with faster cooling (water quenching) give higher tensile strength but lower elongation, while slower cooling (furnace cooling) gives lower strength with higher ductility. The heat treatment should be selected according to the required balance of strength and formability.
Frequently Asked Questions
How does cooling rate affect TC4 strength? Faster cooling, such as water quenching, generally gives higher tensile strength but lower elongation.
What elongation does furnace cooling give? Higher elongation, for example about 12 to 21 percent in the table above.
Why is TC4 widely used? It combines low density, high strength, high-temperature resistance, and good corrosion resistance.
What tensile strength does water-quenched TC4 reach at 1020 deg C? about 1098 MPa with 6 percent elongation and 8 percent area reduction, the highest strength in the reference test table.
Which treatment gives a balanced combination of strength and ductility? according to the test data, water quenching at 950 deg C gives about 1035 MPa tensile strength with 17 percent elongation and 61.5 percent area reduction.
