摘要:
Provided is joint part capable of suppressing diffusion of carbon and nitrogen contained in the steel member to the TiAl-based alloy member and suppressing formation of voids, titanium carbide or a nitride due to diffusion of carbon and nitrogen contained in the steel member, and thereby suppressing decrease in the brazing strength. A joint part comprises a steel member containing alloy elements including C and Cr, a TiAl-based alloy member, and a Ni-based brazing filler metal via which the steel member and the TiAl-based alloy member are joined to each other, wherein the steel member has a carbide and a nitride each forming a bond with at least one of the alloy elements at least on a side of a boundary with the Ni-based brazing filler metal, and diffusion of C and N to the Ni-based brazing filler metal adjacent to the TiAl-based alloy member is suppressed by the carbide and the nitride. The joint part may be a turbine body 1 comprising a turbine wheel 2 and a shaft 3, and a structural steel material of the shaft 3 is structural steel material containing 0.30 to 0.45 wt% of C and 0.85 to 1.25 wt% of Cr, or a martensitic stainless steel material containing at most 15 wt% of C and 11.5 to 13 wt% of Cr.
摘要:
An impeller for a rotary machine includes: a base material of the impeller comprising Al or an Al alloy; a surface layer for the impeller formed by an electroless plating layer comprising a Ni-P based alloy; and an under layer disposed between the base material and the surface layer, the under layer having a smaller Vickers hardness than the surface layer.
摘要:
Said coating structure is provided with: a chemical conversion layer (11), which is formed by chemical conversion coating so as to cover the surface of an impeller body (10) obtained from a magnesium alloy that contains magnesium as the main component and which has a film thickness within a previously determined range; and a plating layer (12) formed so as to cover the chemical conversion layer (11).
摘要:
An object is to provide a variable-geometry exhaust turbine whereby it is possible to prevent deformation and damage to a nozzle support under a high temperature. A variable-geometry exhaust turbine 1 includes: a nozzle mount 2, a nozzle support 6 including a first end portion 6a joined to the first surface 2a of the nozzle mount 2, a nozzle plate 4 including the first surface 2a joined to the second end portion 6b of the nozzle support 6 and supported so as to face the nozzle mount 2 at a distance, and the opposite second surface 4b facing an exhaust-as channel 20 through which exhaust gas flows, and a plurality of nozzle vanes 8 supported rotatably between the nozzle mount 2 and the nozzle plate 4. The nozzle support 6 is capable of tilting along a radial direction so as to absorb a relative displacement in the radial direction between the nozzle mount 2 and the nozzle plate 4 due to thermal expansion.
摘要:
A twin-drum continuous casting method for continuously supplying molten steel between a pair of cooling drums disposed in parallel to each other for solidification thereat and being cast into a thin cast piece wherein at the closest position of the cooling drums, a concave crown amount is imparted to the cooling drums in which the solid phase rate at the thickness-wise centre of a thin cast piece in a range where the distance from an end of the thin cast piece to a central portion is within 50 mm indicates a value equal to or more than a solid phase rate at the fluidity limit or the cooling efficiency in the vicinity of the end portion of the cooling drum is improved.
摘要:
Equipment for manufacturing stainless steel strip formed by arranging in order a double-drum continuous casting machine, a bridal roll- or pinch roll-containing atmosphere control cover, a hot rolling mill, a heat treatment furnace formed by a direct fire burner connected in the lengthwise direction of the furnace to header pipes arranged in parallel in the widthwise direction of the furnace, a cooler, and a take-up unit.