30results about How to "Increased creep life" patented technology

A turbine blade including an airfoil having a profile in accordance with Table 1 is disclosed. The turbine blade has a plurality of cooling passages extending radially outward through the airfoil. The aerodynamic profile of the airfoil has been reconfigured to reduce airfoil stress for a given operating temperature, thereby resulting in increased creep rupture life of the airfoil.

The invention relates to lead-free alloy, which is suitable for use in welding for fixing parts on a substrate and for use on an external electrode for EEFL during the production of electric appliance and electronic products, so that a melting point and welding strength which are better than the prior welding can be obtained without lead. In addition, the alloy is free from lead and can reduce the influences of coal gas and the like generated during welding on human bodies to the maximum degree. Meanwhile, the lead-free alloy has the characteristic that: tin (Sn) is added with 10 to 30 weight percent of bismuthism (Bi), 0.001 to 2.0 weight percent of indium (In), and 0.001 to 0.5 weight percent of phosphor (P), as well as one or more of stibium (Sb), silver (Ag), copper (Cu), germanium (Ge) and gallium (Ga) as additives.

A centrifugal compressor including: a casing; at least one impeller supported for rotation in the casing and provided with a hub, a shroud and an impeller eye; an impeller-eye sealing arrangement, for sealing the impeller in the region of said impeller eye. The centrifugal compressor further includes at least one cooling-medium portlocated at the impeller-eye sealing arrangement, arranged for delivering a cooling medium around the impeller eye.

The invention provides a nickel-based welding wire, a manufacturing method of the nickel-based welding wire and a welding process of the nickel-based welding wire, relates to the technical field of welding materials, and aims to solve the problem of poor welding effect of a heat transfer tube made of an Incoloy800H material. The nickel-based welding wire comprises an outer skin and a flux core filled in the outer skin. The outer skin is an Inconel 625 belt, and the flux core comprises, by mass, 28.0%-32.0% of Co, 19.0%-23.0% of Cr, 7.0%-9.0% of Mo, 1.5%-3.5% of Nb, 1.0%-1.5% of Cu, 1.5%-3.5% of W, 0.6%-1.0% of B, 0.4%-0.6% of La and the balance Ni. According to the nickel-based welding wire provided by the invention, a joint part can keep relatively high tensile strength and ductility under normal-temperature and high-temperature conditions.

The invention relates to a Sn-based soldering flux and a preparation method thereof. The Sn-based soldering flux is mainly prepared by uniformly mixing nano-alumina dispersion strengthened copper Cu-Al2O3 with a molten-state Sn-based alloy. According to the Sn-based soldering flux and the preparation method thereof, the problem of non-uniform dispersion distribution of nano-particles in the Sn-based alloy is solved; and compared with an existing product, the soldering flux has the advantages of being high in tensile strength, high in elongation, high in bonding strength after welding, excellent in high-temperature and low-temperature cyclic impact resistance, high in welding reliability, and the like.

The invention discloses a thermal treatment method capable of prolonging the long-time service life of welding seams in the magnesium-alloy friction stir welding process. The method comprises the steps that aging treatment and water quenching are conducted on a magnesium alloy subjected to solution treatment for 0.5 h to 72 h at 180 DEG C to 280 DEG C; friction stir welding is conducted at room temperature, wherein the rotating speed ranges from 100 rpm to 1,000 rpm, and the welding speed ranges from 20 mm/min to 120 mm/min; and annealing treatment is conducted on the welded magnesium alloy for 0.5 h to 10 h at 250 DEG C to 350 DEG C, the magnesium alloy is directly cooled to 100 DEG C to 200 DEG C after being annealed, and then aging treatment and water quenching are conducted for 0.5 h to 6 h. According to the thermal treatment method, a precipitated phase is introduced for the magnesium alloy, the lattice distortion degree is increased, and the crystallization rate is increased; andrare earth magnesium alloy or high-alloyed magnesium alloy which is difficult to recrystallize is rapidly crystallized in the friction stir welding process, so that the yield strength of the weldingseams is improved, and synchronous improvement of the long-time service lives in the directions parallel to or perpendicular to the welding seam direction is achieved.

The invention relates to a method for obtaining retained austenite in ferrite heat resistant steel T91. The heat treatment process comprises the following steps: performing heat treatment on a T91 steel pipe subjected to hot rolling, namely heating to the temperature of 1100-1200 DEG C at a speed of 4 DEG C per second, and preserving the temperature for 10-20 minutes; continuously cooling to room temperature at a speed of 3 DEG C per second; determining the initial temperature (Ms) and ending temperature (Mf) of martensite phase transformation of the T91 steel in the heat treatment continuous cooling process according to a changing curve of the obtained linear expansion amount along with temperature; heating another identical T91 steel pipe to the temperature of 1100-1200 DEG C at a speed of 4 DEG C per second, and preserving the temperature for 10-20 minutes; and cooling to an optional temperature between Ms and Mf obtained in the step 1 at a speed of 3 DEG C per second, preserving the temperature for 10-45 minutes, and continuously cooling to room temperature at the speed of 3 DEG C per second. The retained austenite existing in a martensite lath boundary in a film form can be obtained in a sample subjected to heat treatment.

The invention discloses a large-wall-thickness P92 steel welding method. The method comprises the following steps of forming and cleaning a welding groove; preheating the welding groove before welding, and then performing backing by adopting a GTAW welding method; welding a welded joint with a welding rod of phi3.2 with an SMAW welding method, wherein a weaving method for a swinging fast thin layer is adopted during welding; performing polishing inspection on a welding layer, and determining the crack cleaning method; repeating the steps above till welding of the whole welding groove is finished; facing the welding groove by adopting the SMAW welding method; and performing thermal treatment on the welded joint. Through reasonable optimization of parameters in the welding process, a properpreheating temperature, inter-layer temperature and thermal treatment temperature are kept. The performance of the welded joint is matched optimally through adoption of a reasonable welding process, so that the P92 steel welding quality is improved, and beneficial guarantee is provided for the normal running of equipment pipelines.

Provided is a metallic wall section cooling method for partially cooling the outer surface of a pipe for circulating steam. The temperature of a pressurized fluid is 500-700 DEG C and the temperatureof the outer surface of the pipe is at least 200 DEG C. The temperature difference in the plate thickness direction of the pipe is no greater than 300 DEG C. The temperature difference at a cooled portion in the pipe axial direction of the pipe is 500 DEG C if the dimension of the pipe in the pipe axial direction is within the range of +/-100 mm. The temperature difference in the pipe circumferential direction of the pipe is no greater than 50 DEG C.

The present invention relates to a method for controlling residual ferrite and martensite slab structure in a 9Cr-ODS steel. The method comprises: mixing pre-alloyed powder and nano-scale Y2O3 according to a mass ratio of 99.65:0.35, wherein the pre-alloyed powder comprises, by mass, 1 part of Fe, 9 parts of Cr, 1.5 parts of W, 0.2 part of V, 0.07 part of Ta, and 0.1 part of C; carrying out mechanical ball milling in a ball mill, heating to a temperature of 800 DEG C by using discharging plasma sintering, carrying out thermal insulation for 5-10 min, continuously heating to a temperature of 1100 DEG C, and carrying out thermal insulation for 10-15 min to obtain a 9Cr-ODS martensite steel having a molding compactness of more than 99%; and carrying out heat treatment on the sintering-state 9Cr-ODS martensite steel, heating to a temperature of 1100 DEG C at a heating rate of 10-40 DEG C/min, carrying out thermal insulation, and cooling to a room temperature. According to the present invention, with the method, the content of the residual ferrite in the 9Cr-ODS martensite steel is effectively controlled, and the ultrafine nano-scale martensite slab can be obtained during the cooling process.