An example track shoe, cutting edge, or other component of a machine is formed in a heated process, such as hot-rolling followed by air-hardening. The air-hardening process involves cooling the component by flowing air over the component (e.g., air cooling), such that the component is cooled at a controlled rate. During the air-cooling process, such as in the range of about 250° C. to about 1100° C., the component may be machined, such as by shearing, punching, drilling, etc. The machining may form the final shape of the component. As the air-hardening process is completed, and the component approaches room temperature, the component may have at least 5% bainitic crystal composition, and as high as greater than 80% bainitic crystal composition, resulting in relatively high hardness and fracture toughness. The final track shoe may have a hardness between about 40 HRC and 55 HRC.

An assembly of an aluminum-based part and a press hardened steel part provided with an alloyed coating including in weight percent, 0.1 to 15.0% silicon, 15.0 to 70% of iron, 0.1 to 20.0% of zinc, 0.1 to 4.0% of magnesium, the balance being aluminum, on at least one of the surfaces thereof placed so as to be in contact with the aluminum-based part.

A vehicle body assembly is described herein, including a first structural component and a second structural component. The first structural component may be a roof component or a side panel, and include a first part including a first metal and a second part including a second metal different than the first metal. The second part is formed on a peripheral edge portion of the first part and defines a mounting flange for the first structural component. The second part is joined to the first part via an ultrasonic additive manufacturing (UAM) interface. The second structural component is including the second metal and is joined to the second part at the mounting flange via a resistance spot weld (RSW) joint.

This frame member includes a corner section extending along the longitudinal direction; a first wall section extending from an end portion of the corner section in a direction orthogonal to the longitudinal direction; and a second wall section extending from an opposite end portion of the corner section, wherein the corner section is formed with a deformation starting portion from which a deformation starts when a load is input to the frame member in the longitudinal direction, the deformation starting portion having a shape protruding to an inner bending side or an outer bending side of the corner section, and an average hardness value H.sub.(K1) at a first region is equal to or greater than 330 Hv in Vickers hardness, and a 3-sigma range of a standard deviation σ in a frequency distribution of the hardness at the first region is equal to or greater than 60, the first region being located at a portion outwardly apart from an end portion of the deformation starting portion in the longitudinal direction by 10 mm in the longitudinal direction, at a depth of ¼ thickness of the frame member from a surface.

Tunnel 1 for a motor vehicle 2 made of a single part and including a main tunnel portion 3 and at least one lateral reinforcement element 5 located on the side of the main tunnel portion 3, wherein the lateral reinforcement element 5 is equipped with a groove 19 to provide high stiffness and high crash resistance and wherein the groove 19 extends over at least part of an inflexion region 15 between the longitudinally oriented part of the tunnel 1 and the upward oriented part of the tunnel 1 and extends over at least part of the front portion of the longitudinally oriented part of the tunnel 1.

A tracked vehicle is provided. The tracked vehicle includes a frame, a driving mechanism installed in the frame, and two track wheels respectively arranged on the left and right sides of the frame. The driving mechanism drives the track wheels to rotate. The track wheel includes a track body, a first main support, a second main support and a third main support provided in the track body. The first main support, the second main support and the third main support are connected to the vehicle frame through the first, second and third connecting rods respectively. The second main support is provided with an auxiliary support frame having one end hinged to the second main support, and the other end of the auxiliary support frame is provided with a first roller contacting with the inner side of the track body.

This vehicle body structure includes a frame member with a first top section, a corner section, a vertical wall section, and a second top section, and a first support section and a second support section provided at the second top section. L/h≤6.7 is satisfied where the h represents a length between an outer surface of the first top section and an outer surface of the second top section, and the L represents a length between the first support section and the second support section.

Light-weight beam assembly and truck trailer using the same are disclosed herein. The light-weight beam assembly is a beam being a single unitary continuous piece comprising at least two cutouts cut through, at least one vertically extending supporting member and a plurality of reinforcement members. Two beams may be connected by a plurality of transversal members for use in a truck trailer.

The frame member has a flat sheet portion with a recessed portion having a pair of wall portions and a bottom portion extending between tip portions in an extending direction of the pair of wall portions, in which a Vickers hardness of a region of the flat sheet portion excluding the recessed portion is 330 Hv or more, a depth of the recessed portion is 5 mm or more, when a width of the recessed portion is L.sub.0 and a cross-sectional length of an inner peripheral wall of the recessed portion consisting of the pair of wall portions and the bottom portion is L.sub.1, a value of (L.sub.1−L.sub.0)/L.sub.0 is 0.18 or more and 2.8 or less, and a Vickers hardness of a ridgeline portion extending between the flat sheet portion and the recessed portion is 1.06 times or more and 1.20 times or less the Vickers hardness of the region of the flat sheet portion excluding the recessed portion.

There is provided an exterior panel including a steel sheet, the steel sheet including a flat portion, wherein in an outer-layer region of the flat portion, a microstructure contains, in volume fraction, ferrite of 80% or more, an average grain diameter of ferrite is 1.0 to 15.0 μm, an intensity ratio X.sub.ODF{001}/{111},S of ferrite is 0.30 or more to less than 3.50, when uEl.sub.1 denotes a uniform elongation measured with a tensile test specimen cut from the flat portion, and uEl.sub.2 denotes a theoretical uniform elongation that is derived from volume fractions, hardnesses, and average grain diameters of ferrite and martensite in a microstructure of an inside region of the flat portion, and a sheet thickness of the flat portion, uEl.sub.1/uEl.sub.2 is 0.44 to 0.80.