A method for processing corrosion resistant austenitic stainless steel includes: preparing a workpiece made of austenitic stainless steel; and applying compressive residual stress to a surface layer of the workpiece without subjecting the surface layer to plastic working.

A method for processing corrosion resistant austenitic stainless steel includes: preparing a workpiece made of austenitic stainless steel; and applying compressive residual stress to a surface layer of the workpiece without subjecting the surface layer to plastic working.

Provided is a hot-dip galvanized steel sheet to be used for home appliances, vehicles, and the like, and having excellent surface appearance and low-temperature bonding brittleness. The hot-dip galvanized steel sheet includes: a base steel sheet; and a hot-dip galvanized layer formed on the base steel sheet. A surface of the base steel sheet has a centerline average roughness (Ra) of 0.3 or more, a roughness skewness (Rsk) of −1 or less, and a roughness kurtosis (Rku) of 6 or more.

The present disclosure discloses a method for improving yield strength of one or more workpieces. The method includes positioning the one or more workpieces in a punch and die assembly and operating the punch and die assembly such that, a plurality of surface protrusions are formed on the one or more workpieces. The plurality of surface protrusions are formed by plastic deformation on the one or more workpieces, to improve yield strength of the one or more workpieces. The present disclosure also provides an apparatus to improve yield strength of the one or more workpieces. The present disclosure is configured to improve yield strength of the one or more workpieces, without altering its mechanical characteristics.

The present disclosure discloses a method for improving yield strength of one or more workpieces. The method includes positioning the one or more workpieces in a punch and die assembly and operating the punch and die assembly such that, a plurality of surface protrusions are formed on the one or more workpieces. The plurality of surface protrusions are formed by plastic deformation on the one or more workpieces, to improve yield strength of the one or more workpieces. The present disclosure also provides an apparatus to improve yield strength of the one or more workpieces. The present disclosure is configured to improve yield strength of the one or more workpieces, without altering its mechanical characteristics.

The invention relates to a method for the impact treatment of transition radii (8) of a crankshaft (4, 4′), in particular transition radii (8) between connecting rod bearing journals (5, 5′) and crank webs (7, 7′) and/or transition radii (8) between main bearing journals (6, 6′) and the crank webs (7, 7′) of the crankshaft (4, 4′). The crankshaft (4, 4′) is then rotated along a rotational direction into an impact position by means of a drive device (3, 3′). A locking device (12) is provided in order to lock the crankshaft (4, 4′) in the impact position, and an impact force is then introduced into at least one transition radius (8) by at least one impact tool (16, 16′).

A damper spring having an excellent fatigue limit is provided. A damper spring according to the present embodiment includes a nitrided layer formed in an outer layer, and a core portion that is further inward than the nitrided layer. The chemical composition of the core portion consists of, in mass%, C: 0.53 to 0.59%, Si: 2.51 to 2.90%, Mn: 0.70 to 0.85%, P: 0.020% or less, 5: 0.020% or less, Cr: 1.40 to 1.70%, Mo: 0.17 to 0.53%, V: 0.23 to 0.33%, Cu: 0.050% or less, Ni: 0.050% or less, Al: 0.0050% or less, Ti: 0.050% or less, N: 0.0070% or less, and Nb: 0 to 0.020%, with the balance being Fe and impurities. In the core portion, a number density of V-based precipitates having a maximum diameter ranging from 2 to 10 nm is 500 to 8000 pieces/μm.sup.2.

An amorphous alloy particle is an amorphous alloy particle formed of an iron-based alloy, and the particle contains a grain boundary layer.

An amorphous alloy particle is an amorphous alloy particle formed of an iron-based alloy, and the particle contains a grain boundary layer.

Provided is a hot-dip galvanized steel sheet to be used for home appliances, vehicles, and the like, and having excellent surface appearance and low-temperature bonding brittleness. The hot-dip galvanized steel sheet includes: a base steel sheet; and a hot-dip galvanized layer formed on the base steel sheet. A surface of the base steel sheet has a centerline average roughness (Ra) of 0.3 or more, a roughness skewness (Rsk) of −1 or less, and a roughness kurtosis (Rku) of 6 or more.