2017 №03 (06) DOI of Article
2017 №03 (08)

Electrometallurgy Today 2017 #03
Electrometallurgy today, 2017, #3, 43-50 pages

Metallurgical methods of improving hydrogen brittleness and crack resistance of heat-resistant nickel alloy

A.I. Balitsky, L.M. Ivaskevich
H.V.Karpenko Physico-Mechanical Institute, NASU. 5, Naukova str., 79601, Lviv, Ukraine. E-mail: balitski@ipm.lviv.ua

Mechanical properties of alloy VZhL-14 (KhN62MTYuL) in cast and powdered state were investigated within the temperature interval of 293…1073 K in vacuum and hydrogen under 35 MPa pressure. It was found that under the hydrogen effect the characteristics of ductility and fracture toughness of cast material , maximum decrease of relative fatigue life of which in hydrogen at 773 K is 90 % of values in vacuum, are most deteriorated. Minimum susceptibility to hydrogen embrittlement is observed in powdered modification of alloy due to higher homogeneous distribution of deformation properties. Ref. 20, Tables 3, Figures 6.

Key words: cast, deformed and powdered alloys; strength; ductility; low-cycle life; fracture toughness
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