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Impact of Interlayer Dwell Time on Microstructure and Mechanical Properties of Nickel and Titanium Alloys
- Source :
- Metallurgical and Materials Transactions A. 48:4411-4422
- Publication Year :
- 2017
- Publisher :
- Springer Science and Business Media LLC, 2017.
-
Abstract
- Path planning in additive manufacturing (AM) processes has an impact on the thermal histories experienced at discrete locations in simple and complex AM structures. One component of path planning in directed energy deposition is the time required for the laser or heat source to return to a given location to add another layer of material. As structures become larger and more complex, the length of this interlayer dwell time can significantly impact the resulting thermal histories. The impact of varying dwell times between 0 and 40 seconds on the microstructural and mechanical properties of Inconel® 625 and Ti-6Al-4V builds has been characterized. Even though these materials display different microstructures and solid-state phase transformations, the addition of an interlayer dwell generally led to a finer microstructure in both materials that impacted the resulting mechanical properties. With the addition of interlayer dwell times up to 40 seconds in the Inconel® 625 builds, finer secondary dendrite arm spacing values, produced by changes in the thermal history, correspond to increased yield and tensile strengths. These mechanical properties did not appear to change significantly, however, for dwell times greater than 20 seconds in the Inconel® 625 builds, indicating that longer dwell times have a minimal impact. The addition of interlayer dwell times in Ti-6Al-4V builds resulted in a slight decrease in the measured alpha lath widths and a much more noticeable decrease in the width of prior beta grains. In addition, the yield and tensile values continued to increase, nearly reaching the values observed in the rolled plate substrate material with dwell times up to 40 seconds.
- Subjects :
- 010302 applied physics
Yield (engineering)
Materials science
Structural material
Metallurgy
Metals and Alloys
Titanium alloy
02 engineering and technology
021001 nanoscience & nanotechnology
Condensed Matter Physics
Microstructure
01 natural sciences
Dendrite (crystal)
Dwell time
Mechanics of Materials
Phase (matter)
0103 physical sciences
Ultimate tensile strength
0210 nano-technology
Subjects
Details
- ISSN :
- 15431940 and 10735623
- Volume :
- 48
- Database :
- OpenAIRE
- Journal :
- Metallurgical and Materials Transactions A
- Accession number :
- edsair.doi...........3530f24ca4f45111b69c765fee00c79f