4results about How to "Increase grain boundary area" patented technology

The application relates to the technical field of bolts, and discloses a heat treatment process for high-strength bolts, which comprises the following steps: obtaining high-strength bolts after vacuum air quenching, tempering and cooling of bolt blank materials; the bolt blank materials are composed of the following components in percentage by weight: C 0.1%-0.15%, Mn 0.4%-0.6%, Mo 0.25%-0.35%, W 0.05%-0.15%, Ti 0.2%-0.3%, Co 0.15%-0.25%, Yb 0.05%-0.1%, Mg 0.15%-0.25%, V 0.08%-0.12%, Eu 0.05%-0.15%, Se 0.03%-0.06%, and the balance is Fe and other inevitable impurities. Through the technical scheme, the problem of poor mechanical properties of bolts in the related art is solved.

The application belongs to the technical field of alloy forging preparation, and particularly relates to a 05Cr17Ni4Cu4Nb forging preparation method for high-strength and high-toughness sealing rings. The 05Cr17Ni4Cu4Nb forging preparation method for high-strength and high-toughness sealing rings improves the strength of the forging matrix, reduces the crack propagation ability of the material, improves the crack propagation work of the material, and improves the toughness of the forging matrix. The 05Cr17Ni4Cu4Nb forging preparation method for high-strength and high-toughness sealing rings has high operability, improves the high-strength and high-toughness of the 05Cr17Ni4Cu4Nb sealing ring forging after heat deformation, cooling and direct aging.

The application relates to the technical field of steel wires, and discloses a corrosion-resistant galvanized steel wire and a preparation method thereof. The corrosion-resistant galvanized steel wire is obtained by galvanizing a steel wire body through plating aid, and the steel wire body is composed of the following components in percentage by weight: C 0.15%-0.20%, Mn 0.28%-0.45%, Mo 0.15%-0.20%, Cu 0.12%-0.25%, W 0.05%-0.10%, Al 0.08%-0.12%, Ti 0.004%-0.016%, Sn 0.004%-0.015%, B 0.005%-0.01%, Y 0.005%-0.008%, S<=0.005%, P<=0.005%, and the balance is iron and inevitable impurities. Through the technical scheme, the problem that the tensile strength of the steel wire body in the galvanized steel wire needs to be improved in the related art is solved.

This invention belongs to the field of aluminum-copper alloy casting technology, and particularly relates to an in-situ particle-reinforced aluminum-copper alloy and its preparation method. The aluminum-copper alloy comprises the following components by weight percentage: 6.0% < Cu < 7.5%, 0.3% < Mn < 0.5%, 0.2% < Cd < 0.5%, 0.1% < Zr < 0.3%, 0.05% < Ti < 0.5%, 0 < V < 0.2%, 0.005 < B < 0.5%, 0 < Ce < 0.5%, with the balance being Al. This invention enhances the strength and plasticity of the alloy by adding a powder mixture of K2TiF6, KBF4, and CeO2 to form dispersed in-situ TiB2 particles; simultaneously, the addition of Ce disperses the TiB2 particles and other precipitated phases in the matrix, resulting in significant grain refinement and narrowing of the dendrite spacing.