The invention relates to a method for the impact treatment of transition radii (8) of a crankshaft (4), in particular transition radii (8) between connecting rod bearing journals (5) and crank webs (7) and/or transition radii (8) between main bearing journals (6) and the crank webs (7) of the crankshaft (4). In order to apply an impact force (FS) to at least one of the transition radii (8) along the respective transition radius (8) circulating about the crankshaft (4) in an annular manner, a heavily loaded region (BMAX), a lightly loaded region (BMIN), and intermediate regions (BZW) lying therebetween are defined, and an impact treatment is then carried out such that the impact force (FS) introduced into the intermediate regions (BZW) is increased in the direction of the heavily loaded region (BMAX).

Stainless steel with improved hydrophilicity and contact resistance for a Polymer Electrolyte Membrane Fuel Cell (PEMFC) separator, and a method of manufacturing the stainless steel Stainless steel are disclosed. Stainless steel for a Polymer Electrolyte Membrane Fuel Cell (PEMFC) separator according to an embodiment of the present disclosure may include: by weight percent, 0 to 0.02% of C (excluding 0), 0 to 0.02% of N (excluding 0), 0 to 0.25% of Si (excluding 0), 0 to 0.2% of Mn (excluding 0), 0 to 0.04% of P (excluding 0), 0 to 0.02% of S (excluding 0), 20 to 34% of Cr, 0 to 0.6% of V (excluding 0), 0 to 0.5% of Ti (excluding 0), 0 to 0.5% of Nb (excluding 0), and the remainder comprising iron (Fe) and other unavoidable impurities, wherein a plurality of patterns may be formed on a surface of the stainless steel in a direction that is inclined with respect to a rolling direction, and the plurality of patterns are arranged repeatedly in the rolling direction.

Stainless steel with improved hydrophilicity and contact resistance for a Polymer Electrolyte Membrane Fuel Cell (PEMFC) separator, and a method of manufacturing the stainless steel Stainless steel are disclosed. Stainless steel for a Polymer Electrolyte Membrane Fuel Cell (PEMFC) separator according to an embodiment of the present disclosure may include: by weight percent, 0 to 0.02% of C (excluding 0), 0 to 0.02% of N (excluding 0), 0 to 0.25% of Si (excluding 0), 0 to 0.2% of Mn (excluding 0), 0 to 0.04% of P (excluding 0), 0 to 0.02% of S (excluding 0), 20 to 34% of Cr, 0 to 0.6% of V (excluding 0), 0 to 0.5% of Ti (excluding 0), 0 to 0.5% of Nb (excluding 0), and the remainder comprising iron (Fe) and other unavoidable impurities, wherein a plurality of patterns may be formed on a surface of the stainless steel in a direction that is inclined with respect to a rolling direction, and the plurality of patterns are arranged repeatedly in the rolling direction.

The invention relates to a device for the impact treatment of transition radii (8) of a crank-shaft (4), in particular transition radii (8) between connecting rod bearing journals (5) and crank webs (7) and/or transition radii (8) between main bearing journals (6) and the crank webs (7) of the crankshaft (4). The device comprises an impact device (1) in order to introduce an impact force (FS) into at least one transition radius (8), wherein the impact device (1) has multiple impact heads (21) which are paired with the same transition radius (8).

The present invention discloses a portable multi-azimuth ultrasonic-assisted vibration rolling device and an application method thereof. The vibration rolling device includes an ultrasonic rolling unit, a hydraulic power unit, a pneumatic cooling unit, a main body frame and an indexing device; an amplitude transformer assembly at the ultrasonic rolling unit comes into rolling contact with the surface of a tooth space of a gear workpiece, the hydraulic power unit is articulated with the main body frame, and the hydraulic power unit is articulated with the horn assembly, the indexing device is provided at the main body frame, and the gear workpiece is mounted at the indexing device. The present invention has the advantages that the device is flexible and portable, enables a transducer to be cooled continuously, and facilitates fixation of a rolling steel ball and adjustment of a station of the gear workpiece.

The present invention discloses a portable multi-azimuth ultrasonic-assisted vibration rolling device and an application method thereof. The vibration rolling device includes an ultrasonic rolling unit, a hydraulic power unit, a pneumatic cooling unit, a main body frame and an indexing device; an amplitude transformer assembly at the ultrasonic rolling unit comes into rolling contact with the surface of a tooth space of a gear workpiece, the hydraulic power unit is articulated with the main body frame, and the hydraulic power unit is articulated with the horn assembly, the indexing device is provided at the main body frame, and the gear workpiece is mounted at the indexing device. The present invention has the advantages that the device is flexible and portable, enables a transducer to be cooled continuously, and facilitates fixation of a rolling steel ball and adjustment of a station of the gear workpiece.

A method for manufacturing a metal plate, the metal plate including a first surface and a second surface positioned on the opposite side of the first surface, may include a step of rolling a base metal having an iron alloy containing nickel to produce the metal plate. The metal plate may include particles containing as a main component an element other than iron and nickel. In a sample including the first surface and the second surface of the metal plate, the following conditions (1) and (2) regarding the particles may be satisfied: (1) The number of the particles having an equivalent circle diameter of 1 μm or more is 50 or more and 3000 or less per 1 mm.sup.3 in the sample, and (2) The number of the particles having an equivalent circle diameter of 3 μm or more is 50 or less per 1 mm.sup.3 in the sample.

In accordance with one aspect of the present disclosure a method of hardening an article of manganese steel is shown. The method includes applying an ultrasonic impact treatment (UIT) on a surface of the article of manganese steel, the ultrasonic impact treatment corresponding to operational parameters, the operational parameters may include an operating ultrasonic frequency, mechanical energy, treatment travel speed, applied force, pattern, or coverage percentage, and each of the operational parameters are independently controllable.

In accordance with one aspect of the present disclosure a method of hardening an article of manganese steel is shown. The method includes applying an ultrasonic impact treatment (UIT) on a surface of the article of manganese steel, the ultrasonic impact treatment corresponding to operational parameters, the operational parameters may include an operating ultrasonic frequency, mechanical energy, treatment travel speed, applied force, pattern, or coverage percentage, and each of the operational parameters are independently controllable.

A process for cold working of the inner surface of a bore in a centrifugal compressor wheel along only a fractional portion of the bore length (i.e., along less than a full axial length of the bore), thereby creating a zone of compressive residual hoop stress in the metal surrounding the bore where the wheel needs the beneficial residual stress. The process purposefully avoids cold working of the bore at locations adjacent to high-stress areas and features of the wheel, where cold working in such locations could negatively impact the wheel's overall life.