10 results about "Cr element" patented technology

This invention discloses a high-elongation aluminum alloy for lightweight automotive components and its preparation method, relating to the field of aluminum alloy material technology. It features a hierarchical porous structure with surface micron-sized closed pores and a core nano-sized through-pore. The Ti and Mn elements synergistically form an Al-Ti-Mn martensitic phase transformation core region with Al, and the Cr element precisely controls the martensitic phase transformation initiation temperature to room temperature, ensuring stable triggering of the austenite-to-martensitic phase transformation and energy absorption during room-temperature collisions. This invention achieves initial impact buffering and gradual collapse energy absorption through a hierarchical porous structure with surface micron-sized closed pores and a core nano-sized through-pore. This dual energy absorption mechanism significantly improves the material's strength-ductility product, far exceeding that of traditional aluminum alloys.

This invention discloses a titanium alloy plate for marine engineering and its preparation method, belonging to the field of titanium alloy manufacturing technology. The invention introduces 1.5-2% Cr element into the titanium alloy, synergistically using Mo and Nb to regulate the stability and microstructure evolution of the β phase; employs forging to break the as-cast microstructure and refine the grains; combines 90° reversing hot rolling to break the texture inheritance; and improves the uniformity of the plate's thickness and suppresses edge cracks through cladding and stacking rolling; finally, a matched solution aging treatment is performed to achieve a synergistic improvement in strength, toughness, and microstructure uniformity. The resulting plate has a uniform microstructure, significantly weakened anisotropy, and excellent balanced mechanical properties, meeting the performance requirements of marine load-bearing components. It is suitable for deep-sea equipment, ships, and offshore platform structural components, with broad application prospects.

The present application relates to a kind of manganese cobalt spinel coating and its preparation method and application, belong to solid oxide fuel cell material technical field.The manganese cobalt spinel coating described in the present application is coated on the substrate containing Cr element, including the binding layer on substrate and the structural layer on the binding layer;The binding layer includes the following components: manganese cobalt spinel material, MnCr2O4, Cr2O3;The structural layer is manganese cobalt spinel material;The chemical formula of the manganese cobalt spinel material is Mn 1+ x Co 2‑x O4, wherein, -1

The application provides a brazing process of an aluminum alloy material for brazing. The material of a runner plate used in the brazing process is an aluminum rare earth material, which comprises, in percentage by mass, 7.0-9.0% of a rare earth metal element RE, 0.4-0.6% of an Fe element, 0.6-1.2% of an Mn element, 0.3-0.5% of a Cr element, 0.02-0.15% of an Mg element, 0.1-0.2% of a Ti element, 0.02-0.2% of a V element, 0.02-0.1% of a B element, ≤0.1% of an Si element, ≤0.01% of a Cu element, the balance of an Al element and inevitable impurities, and ≤0.05% of a single impurity element. After brazing by the brazing process, the weld is full and has high strength, and the brazing process is suitable for brazing of runner plates with various complex structures.

The application belongs to the technical field of alloy material preparation, and particularly relates to a method for improving corrosion resistance of eutectic high-entropy alloy. The method comprises the following steps: homogenization annealing treatment, quenching treatment, cold rolling treatment, low-temperature short-time annealing treatment and quenching treatment. Through the method, fine FCC phase rich in Cr element is precipitated in B2 lamella of the eutectic high-entropy alloy, and structural defects such as dislocation, subgrain boundary, small-angle and large-angle grain boundary and twin boundary are introduced into the alloy. The above-mentioned microstructure characteristics promote the nucleation and growth of corrosion-resistant passivation film on the surface of the eutectic high-entropy alloy, thereby improving the corrosion resistance of the eutectic high-entropy alloy in a corrosive medium. The method is simple and easy to implement, low in cost, and very suitable for industrialized production and application of high-performance eutectic high-entropy alloy.

The application belongs to the field of metal material high-temperature alloy, and discloses a low-density cobalt-based high-temperature alloy with high elongation and high oxidation resistance and a preparation method. The cobalt-based high-temperature alloy comprises Co, Ni, Al, Ti, Ta, Cr, B, Zr and inevitable impurity elements; the atomic percentage of each element is as follows: 20-40% of Ni, 5-15% of Al, 1-15% of Ta, 0-2% of Ti, 5-12% of Cr, 0-1% of B, 0-1% of Zr, and the rest is Co and inevitable impurity elements. The application significantly improves the plasticity and oxidation resistance of the alloy by adding micro-alloying elements and corrosion-resistant Cr elements, and reduces the density of the alloy by removing the W element in the gamma'-Co3(Al, W) phase.

The application belongs to the technical field of non-ferrous metal processing, and particularly relates to a high-toughness and high-tensile Zn4Al die-casting zinc alloy added with Cr element and a preparation method thereof. The Zn4Al die-casting zinc alloy is composed of Al: 3.8-4%, Cr: 0-0.02% and not 0, and the balance of Zn and inevitable impurities; wherein, Fe<=0.005%, Mg<=0.0005%, Pb<=0.0005%. The Zn4Al die-casting zinc alloy has a tensile strength of 300 MPa, an elongation after fracture of 4%, and an impact toughness of 125.35 J / cm 2 After natural aging for 3000 h, the tensile strength only decreases by 2%, the elongation increases to 15%, and the anti-aging property is relatively strong.

This invention discloses a Ti-Al-Cr titanium alloy and its preparation method, belonging to the field of metallic materials technology. The preparation method includes the following steps: first, titanium, aluminum, and chromium raw materials are pre-melted, melted, and refined sequentially using a vacuum arc melting method; then, they are cast into shape and melted repeatedly; finally, after heat treatment, they are cooled to room temperature with ice water to obtain the alloy. This invention provides a method that can precisely control the amount of Cr added and ensure its uniform distribution, realizing the preparation of Ti-Al-Cr titanium alloy. By combining Cr element modification with heat treatment, based on solid solution strengthening effect and grain boundary strengthening mechanisms, the strength and toughness of the titanium alloy are improved simultaneously. This achieves directional control of the mechanical properties of the titanium alloy, solving the problems of difficulty in controlling the uniformity of Cr distribution and easy formation of harmful brittle phases in the preparation of Cr element modified titanium alloys in the prior art.

The present application relates to a kind of high toughness high thermal conductivity hot work die steel and its production method, belong to die steel production technical field.The present application is based on H11 steel and H13 steel, fine-tune chemical composition, reduce the content of silicon element and slightly improve Cr element content to ensure the oxidation resistance while improving thermal conductivity, by adding a small amount of Nb element content further refine grain, by adding trace rare earth Ce element to modify inclusion.The method is obtained by vacuum induction melting, vacuum consumable melting, high temperature homogenization and forging, ultra-fine and spheroidizing annealing and quenching and tempering treatment high thermal conductivity, inclusion number density≤1 / mm 2 ;And transverse V-shaped notch Charpy impact energy is improved to about 45J hot work die steel.The thermal conductivity and impact toughness of existing die steel cannot meet the service life requirement of body integration die casting die.