Effects of Mo segregation on Charpy absorbed energy in Ti-12Mo alloys

Beta phase stabilizing elements such as Mo have strong tendency to segregate. We have introduced swirly type segregation of Mo in Ti-12Mo (mass %) alloy through groove bar rolling. After solution treatment and low temperature aging, hard omega phase was precipitated heterogeneously, which improved t...

Full description

Saved in:
Bibliographic Details
Published inMATEC Web of Conferences Vol. 321; p. 11050
Main Authors Emura, Satoshi, Ji, Xin, Min, Xiaohua, Tsuchiya, Koichi
Format Journal Article Conference Proceeding
LanguageEnglish
Published Les Ulis EDP Sciences 2020
Subjects
Aging (metallurgy)
Alloying elements
Alloys
Beta phase
Charpy impact test
Ductile fracture
Elongation
Fracture surfaces
Grooves
High temperature
Impact strength
Intergranular fracture
Low temperature
Molybdenum
Room temperature
Solution heat treatment
Tensile strength
Thermomechanical treatment
Titanium base alloys
Transgranular fracture
Online AccessGet full text

Cover

More Information
Summary:Beta phase stabilizing elements such as Mo have strong tendency to segregate. We have introduced swirly type segregation of Mo in Ti-12Mo (mass %) alloy through groove bar rolling. After solution treatment and low temperature aging, hard omega phase was precipitated heterogeneously, which improved the room temperature tensile elongation values without sacrificing tensile strength. In this study, the effect of Mo segregation and heterogeneous distribution of omega phase on Charpy absorbed energy was investigated in Ti-12Mo alloy. Samples with two types of segregation were prepared; namely, swirly segregation in bar rolled sample and layered segregation in plate rolled sample. For comparison, we have also prepared Ti-12Mo bar samples with lesser Mo segregation, through high temperature thermomechanical treatment. Charpy impact tests were carried out at room temperature, 373 K and 473 K, respectively, using the samples after aging to introduce isothermal omega-phase. The samples with the segregation exhibited higher Charpy absorbed energy, especially at higher temperature of 473 K, while the sample with the swirly segregation showed higher Charpy absorbed energy than that with the layered segregation. The sample with lesser Mo segregation exhibited brittle intergranular fracture surface after Charpy testing. On the contrary, samples with Mo segregation exhibited ductile transgranular fracture surfaces.
ISSN:2261-236X
2274-7214
2261-236X
DOI:10.1051/matecconf/202032111050