Methods of strengthening surface regions of high-strength transformation induced plasticity (TRIP) steel are provided. The method may comprise shot peening at least one region of an exposed surface of a hot-formed press-hardened component comprising a high-strength steel. Prior to shot peening, the component has a microstructure comprising ≧about 5% by volume retained austenite in a matrix of martensite. The shot peening is conducted at a temperature of <about 150° C. and forms at least one hardened surface region comprising ≦about 2% by volume austenite. The TRIP steel may be zinc-coated and having a surface coating comprising zinc and substantially free of liquid metal embrittlement (LME). Zinc-coated hot-formed press-hardened components, including automotive components, formed from such methods are also provided.

Methods of selectively cooling and quenching surface regions of high-strength transformation induced plasticity (TRIP) steel are provided. The method may comprise selectively cooling at least one region of an exposed surface of a hot-formed press-hardened component comprising a high-strength steel. Prior to selective cooling, the component has a microstructure comprising≧about 5% by volume retained austenite in a matrix of martensite. The selective cooling is conducted at a temperature of≦about −40° C. and forms at least one quenched region comprising≦about 2% by volume austenite. The TRIP steel may be zinc-coated and having a surface coating comprising zinc and substantially free of liquid metal embrittlement (LME). Zinc-coated hot-formed press-hardened components, including automotive components, formed from such methods are also provided.

A thermal shielding system for thermally shielding a batch space of high-temperature furnaces includes at least one shielding element. The shielding element has an encasing wall formed of refractory metal sheet(s) and a ceramic material accommodated in the wall. The ceramic material is present in a particulate and/or fibrous structure and it is based on zirconium oxide (ZrO.sub.2)

A thermal shielding system for thermally shielding a batch space of high-temperature furnaces includes at least one shielding element. The shielding element has an encasing wall formed of refractory metal sheet(s) and a ceramic material accommodated in the wall. The ceramic material is present in a particulate and/or fibrous structure and it is based on zirconium oxide (ZrO.sub.2)

A method for producing an Fe-based nanocrystalline alloy ribbon, the method including a step of supplying a molten Fe-based alloy onto a rotating chill roll, and rapidly solidifying the molten Fe-based alloy that has been supplied onto the chill roll, thereby obtaining an Fe-based amorphous alloy ribbon having a free solidified surface and a roll contact surface, and a step of heat-treating the Fe-based amorphous alloy ribbon, thereby obtaining an Fe-based nanocrystalline alloy ribbon; wherein an outer peripheral part of the chill roll is composed of a Cu alloy, and a thermal conductivity of the outer peripheral part is from 70 W/(m.Math.K) to 225 W/(m.Math.K).

Embodiments of the present disclosure provide a method of manufacturing an arcuate blade for a broadhead including: stamping a shape of a blade from a material, the blade having an inner and outer edge; grinding the inner edge of the blade to form a cutting edge; forming the blade into an arcuate shape; tempering the blade to harden the material; and electrolyzing the blade into a finished product.

An apparatus for heating a metal billet such as a billet of non-ferrous metal, includes a frame, a heating container having a longitudinal billet receiving inner space, and at least one heater element configured to heat the heating container. The heating container is divided along parting surfaces into parts. The parts are movable arranged with respect to each other. Each part has a contact surface facing the longitudinal billet receiving inner space. Each part has at least one heater element configured to heat the part.

To provide a turbine rotor which enables mass production with a low-cost apparatus and which capable of suppressing leaning of the rotor shaft after welding to improve the yield, while a turbine blade rotor 12 and the rotor shaft 14 are fit to each other with concave and convex portions 12a and 14a and are permitted to be rotated, laser beam L from a laser beam generating device 30 is applied to a joint face 16 along the circumferential direction to weld the welding portion. Then, laser beam L is polarized to temper a region X on the rotor shaft side containing the welding portion with laser beam L. In contrast to residual stress R.sub.1 having a local angular distribution generated during the welding, residual stress R.sub.2 is permitted to be generated over the entire circumference by tempering. Leaning of the rotor shaft 14 after cooling is thereby be suppressed.

A brazed joint having excellent tensile strength (TSS and CTS) and a method of production of the same are provided. A sheet combination 200 comprised of steel sheets 210, 220 between which a brazing filler metal 230 is clamped is heated at a temperature of the Ac3 point of the steel sheet (matrix material) or more. The Ar3 point of the regions near the brazing filler metal at the steel sheets is made higher than the Ar3 point of the steel sheets (matrix material), then the quenching start temperature X is made a temperature of the Ar3 point of the steel sheet (matrix material) or less and hot stamping is performed to produce a brazed joint.

A method for making a vehicle body component includes forming a generally flat plate of unhardened, hot-formable sheet steel with a marginal shape which corresponds essentially to the developed configuration of the finished vehicle body component. The formed plate is hot-formed and hardened in a single press tool to define a sheet profile which corresponds to the configuration of the finished vehicle body component, and a surface coating is applied to the sheet profile.