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Forming method for cobalt-chromium-molybdenum superalloy bar

A forming method and superalloy technology, which is applied in the forming field of cobalt-chromium-molybdenum superalloy rods, can solve the problems of coarse grains, unevenness, and poor mechanical properties of the rods, and achieve uniform alloy composition, high yield, and easy processing The effect of large deformation rate

Active Publication Date: 2017-05-17
JIANGSU LONGDA SUPERALLOY MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a cobalt-chromium-molybdenum superalloy ingot with a simple preparation method to solve the problems that the cobalt-chromium-molybdenum superalloy ingot is easy to crack and the grain of the cast-formed bar is relatively coarse, uneven, and poor in mechanical properties during conventional free forging. Forming method of molybdenum superalloy rod

Method used

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  • Forming method for cobalt-chromium-molybdenum superalloy bar

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Embodiment 1

[0020] A method for forming a cobalt-chromium-molybdenum superalloy rod: comprising the following steps

[0021] Using 250kg vacuum induction melting furnace, at 10 -1 Under the condition of vacuum degree above Pa, electrolytic cobalt, electrolytic chromium, and metal molybdenum are smelted into Φ180mm electrode ingots, and remelted in a 300kg electroslag furnace for the second time, and slag electroslag is added to form Φ260mm electroslag ingots, and argon gas protection is used. The components in the slag are calculated by mass percentage: CaF2: 55%, Al2O3: 20%, CaO: 20%, TiO2: 5%;

[0022] The electroslag ingot is homogenized in the electric furnace, and the temperature is raised to 1160±10°C with the furnace, kept for 16 hours, and air-cooled after being released from the furnace;

[0023] Heat the homogenized ingot to 1180±10°C for 150 minutes, then directly open the billet on the GFM-SX-32 precision forging machine, the initial forging temperature is about 1150°C, and t...

Embodiment 2

[0027] A method for forming a cobalt-chromium-molybdenum superalloy rod: comprising the following steps

[0028] The preparation method of the cobalt-chromium-molybdenum superalloy ingot is the same as above. The ingot of Φ260 is homogenized in the electric furnace, and the temperature is raised to 1200±10°C with the furnace, kept for 12 hours, and air-cooled after being released from the furnace.

[0029] Heat the homogenized ingot to 1180±10°C for 150 minutes, and then directly forge the billet on the GFM-SX-32 precision forging machine. The initial forging temperature is about 1150°C, and the final forging temperature is about 1000°C; the billet size is Φ80*L.

[0030] The precision forged billet is surface treated with a lathe or grinder to remove surface defects, heated to 1160±10°C, kept for 90 minutes, and then rolled in a 430 rolling mill. The initial rolling temperature is about 1130°C and the final rolling temperature is about 960°C ; Bar size Φ32*L.

[0031] Depe...

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Abstract

The invention relates to a forming method for a cobalt-chromium-molybdenum superalloy bar. Metal cobalt, metal chromium and metal molybdenum are adopted as raw materials, and the cobalt-chromium-molybdenum superalloy bar is finally prepared and obtained sequentially through vacuum smelting, electroslag remelting, homogenization treatment, finish forge cogging and rolling forming. The preparing method is simple, steps are easy to operate, cast ingot alloy components can be more uniform through the homogenization treatment in the preparing technology, during cogging, a finish forging device is used for cogging, the stress of the cast ingot alloy in the circumferential direction is uniform and consistent, deformation is uniform, and cracking of the alloy due to uneven stress or temperature difference is avoided; rolling is conducted after the blank surface is treated, the rolling time is short, the machining deformation rate is large, and efficiency is high; and meanwhile, the bar machined through the method is high in size precision and high in yield, grain is fine and uniform, and the mechanical performance is excellent.

Description

technical field [0001] The invention relates to a forming method of a cobalt-chromium-molybdenum superalloy rod, belonging to the technical field of material forming. Background technique [0002] Due to the increasing aging of human beings, the market for bone and joint prostheses is growing at a rate of 20%. Artificial joint products have become the most promising new technology and new industry in the early 21st century. Cobalt-chromium-molybdenum superalloys have excellent mechanical properties, corrosion resistance and biocompatibility, and are important materials for orthopedic metal implants. It can be used in the field of human bone joint prosthesis such as hip joint handle and knee joint, and is irreplaceable. However, cobalt-chromium-molybdenum superalloys are intermetallic compound materials with high chromium content, brittle and hard properties, poor plasticity, and difficult material processing, which limits the production of cobalt-chromium-molybdenum superal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/10C22C19/07
CPCC22C19/07C22F1/10
Inventor 王耕春周向东浦益龙王颜臣吕斌
Owner JIANGSU LONGDA SUPERALLOY MATERIAL CO LTD
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