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Effects of C and Hf concentration on phase relations and microstructure of a wrought powder-metallurgy superalloy
Springer Science and Business Media LLC - Tập 8 - Trang 259-263 - 1977
NASA IIB-11, a candidate alloy for advanced temperature turbine engine disks, and four modifications with varying C and Hf concentrations were produced from prealloyed powders. Several notable effects of C and Hf concentration in the alloys were observed. Both the amount of the γ′ phase and its solvus temperature increased with decreasing C, but only the γ′ solvus was affected by Hf, increasing wi...... hiện toàn bộ
A mechanistic study of transgranular stress corrosion cracking of type 304 stainless steel
Springer Science and Business Media LLC - Tập 22 - Trang 1453-1461 - 1991
Transmission electron microscopy (TEM) was utilized to characterize the deformation substructure of 304 stainless steel tested for transgranular stress corrosion cracking (TGSCC) in 45 wt pet MgCl2 at 155 °C. The TEM characterization was conducted in thin foils prepared from the fracture surface and from a series of known depths below the fracture surface. The results indicate that the stacking fa...... hiện toàn bộ
Exceptional ductility in the superplastic Pb-62 Pct Sn eutectic
Springer Science and Business Media LLC - Tập 8 Số 11 - Trang 1832-1833 - 1977
The toughness of high hardness laminar composite steel as influenced by specimen and crack orientation
Springer Science and Business Media LLC - Tập 6 - Trang 1093-1100 - 1975
The toughness behavior of high hardness laminar composite steel (high carbon, ∼ Rc 60, hard layer metallurgically bonded to a medium carbon ∼Rc 50, softer layer) was investigated. The effort focused on the effect of test temperature, specimen orientation and crack location on toughness. Charpy V-notch specimens with the notch extending through both the hard and soft layers were tested over a serie...... hiện toàn bộ
Bainite formation in a silver-cadmium alloy
Springer Science and Business Media LLC - Tập 20 - Trang 1169-1174 - 1989
The changes in X-ray diffraction intensity and internal friction within and beyond the incubation period of bainitic transformation on the isothermal TTT diagram in a silver-cadmium (43.3 wt pct Cd) alloy were studied. Experimental results show that the parent-phase X-ray diffraction intensity and the internal friction value increase immediately at the beginning of isothermal holding and that the ...... hiện toàn bộ
Combustion synthesis and subsequent Explosive Densification of Titanium Carbide Ceramics
Springer Science and Business Media LLC - Tập 23 - Trang 2365-2372 - 1992
Explosive densification following combustion synthesis of titanium and graphite powder mixtures has been used to fabricate bulk compacts (100-mm diameter × 20-mm thick) of TiC ceramics. A model rocket ignitor was used to initiate the combustion reaction in ≈65 pct dense green pressed reactants of titanium and carbon powder mixtures. Upon completion of reaction, the reacted mass was allowed to cool...... hiện toàn bộ
Application of the double-shear theory of martensite crystallography to the β → α′ transformation in an U(Ga) alloy
Springer Science and Business Media LLC - Tập 21 - Trang 2131-2136 - 1990
The phenomenological double-shear theory of martensite crystallography has been applied to the β → α′ martensitic transformation in the U-1.6 at. pct Ga alloy. A correspondence matrix for the β → α′ transformation was derived from the experimentally determined β/α′ orientation relationship, and the double lattice invariant shear was considered as a combination of the principal slip (010) [100]a wi...... hiện toàn bộ
Carbide morphology in p/m IN-792
Springer Science and Business Media LLC - Tập 7 - Trang 1497-1502 - 1976
Adequate tensile and smooth stress rupture properties were achieved by heat treating p/m IN-792 to produce serrated grain boundaries pinned with a globular M23C6 precipitate. A notch-strengthened condition with Kt = 3.5 at 1400‡F (1033 K)/90 ksi (620 MN/m2) was achieved when the material was heat treated to produce a grain size larger than about 76 Μm (ASTM G.S. #6). To obtain this grain size usin...... hiện toàn bộ
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