A system and apparatus for conducting a modified Jominy end-quench test of a metal composition having an Austenitizing temperature and a critical cooling rate may comprise a bar, comprising the metal composition, said bar having a hemispherical tip and a bar length. The system may also comprise a bar receptacle. The system may also comprise a quenchant. Additionally, the system may also comprise a quenchant discharge apparatus as a quenchant nozzle. In the system a portion of the hemispherical tip of the bar passes through a portion of the bar receptacle, exposing it to a quenchant exiting the quenchant nozzle with a gap existing between the quenchant nozzle and the hemispherical tip of the bar. This is useful in characterizing an alloy's hardenability and residual stresses for finite element analysis and part design.

A method for repairing break of a universal connecting rod of a universal coupling includes steps of: cleaning and detecting cracks, providing primary anneal, depositing alloys, providing secondary anneal, manually milling and controlling a quality; wherein depositing the alloys includes forming gradient in an order of a bonding layer, a transition layer, a working layer and a processing layer; wherein the bonding layer: S and P in the depositing area are diluted with an FGM-KM1.sup.# material, for removing or reducing the S and P, so as to avoid cold and hot cracks; the transition layer: which is formed by an FGM-KM2.sup.# material for improving impact toughness and evacuation stress, and appropriate increasing hardness; the working layer: which is formed by an FGM-KM3.sup.# material for improving heat resistance, wear resistance and load capacity; and the processing layer: an FGM-KM4.sup.# material is used to reduce surface hardness and improve processing performance.

A method for repairing break of a universal connecting rod of a universal coupling includes steps of: cleaning and detecting cracks, providing primary anneal, depositing alloys, providing secondary anneal, manually milling and controlling a quality; wherein depositing the alloys includes forming gradient in an order of a bonding layer, a transition layer, a working layer and a processing layer; wherein the bonding layer: S and P in the depositing area are diluted with an FGM-KM1.sup.# material, for removing or reducing the S and P, so as to avoid cold and hot cracks; the transition layer: which is formed by an FGM-KM2.sup.# material for improving impact toughness and evacuation stress, and appropriate increasing hardness; the working layer: which is formed by an FGM-KM3.sup.# material for improving heat resistance, wear resistance and load capacity; and the processing layer: an FGM-KM4.sup.# material is used to reduce surface hardness and improve processing performance.

A steel alloy composition is disclosed. The steel alloy composition may comprise 0.36% to 0.60% by weight carbon, 0.30% to 0.70% by weight manganese, between 0.001% to 0.017% by weight phosphorus, 0.15% to 0.60% by weight silicon, and 1.40% to 2.25% by weight nickel. The steel alloy composition may further comprise 0.85% to 1.60% by weight chromium, 0.70% to 1.10% by weight molybdenum, 0.010% to 0.030% by weight aluminum, 0.001% to 0.050% by weight zirconium, and a balance of iron.

The present invention refers to a method for repairing a component, in particular a component of an internal combustion engine, by heat treating, in particular tempering. The method comprises a step of obtaining a material specific reference parameter which has been determined based on at least one reference test carried out on a reference sample made of the same material as the component to be heat treated, wherein the reference parameter is indicative of a desired heat treating effect on the material of the component to be heat treated; a step of determining at least one of a heating temperature and heating duration in dependence on the obtained reference parameter; and a step of heat treating the component in accordance with at least one of the determined heating temperature and determined heating duration.

The present invention refers to a method for repairing a component, in particular a component of an internal combustion engine, by heat treating, in particular tempering. The method comprises a step of obtaining a material specific reference parameter which has been determined based on at least one reference test carried out on a reference sample made of the same material as the component to be heat treated, wherein the reference parameter is indicative of a desired heat treating effect on the material of the component to be heat treated; a step of determining at least one of a heating temperature and heating duration in dependence on the obtained reference parameter; and a step of heat treating the component in accordance with at least one of the determined heating temperature and determined heating duration.