Ti-Al-Cr-Mo alloy and preparation method of plate thereof

Abstract

The invention relates to a Ti-Al-Cr-Mo alloy and a preparation method of a plate thereof. The alloy comprises the following components in percentage by weight: 45-49 Ti, 0.5-5 Al, 0.1-0.3 Cr, and the balance of Mo; and the preparation method of the plate of the alloy comprises the following steps of: 1 preparing the Ti-Al-Cr-Mo alloy by adopting an HIP (Hot Isostatic Pressing) method; 2 cutting to obtain a blank required by rolling from the alloy prepared by adopting the HIP method; 3 putting the blank obtained in the step 2 into a pure titanium plate sheath; 4 putting the Ti-Al-Cr-Mo alloy with the sheath into a heating furnace and preheating; and 5 carrying out multi-pass rolling at small pass and low deformation speed on the Ti-Al-Cr-Mo alloy with the sheath, then putting into an electric furnace and cooling with the furnace; and removing the sheath to obtain the Ti-Al-Cr-Mo alloy plate. The invention solves the difficult problems that the Ti-Al-Cr-Mo alloy is more brittle and difficult to deform at high temperature and prepare the Ti-Al-Cr-Mo alloy plate in a rolling manner. The invention has simple process and method as well as reasonable process parameters; an alloy ingot blank prepared by adopting the HIP method is directly rolled by adopting the sheath; the plate prepared by adopting the rolling manner has even deformation; and the rolled alloy has even and tiny tissue, no edge crack and surface crack and good surface quality and is suitable for industrialized production.

Description

technical field [0001] The invention discloses a Ti-Al-Cr-Mo alloy and a preparation method thereof, and belongs to the technical field of powder metallurgy material preparation and thermal deformation thereof. Background technique [0002] TiAl-based alloy has high specific strength, high specific stiffness, low density, good flame retardancy, high temperature oxidation resistance and creep resistance. It is a very potential light-weight high-temperature structural material. It has broad application prospects. However, TiAl-based alloys are brittle and are difficult to deform. It is difficult to process deformation at room temperature and high temperature, especially the rolling deformation of plates. Plate preparation technology is one of the important research directions of TiAl-based alloys. Scholars at home and abroad have achieved certain results in the research on TiAl-based alloy sheet rolling. For example, in the late 1980s, Japan's isothermal rolling and the Unit...

AI Technical Summary

Problems solved by technology

However, the TiAl-based alloy sheets prepared by the above two methods have the following disadvantages: (1) the blanks used by Junpinlin et al. before rolling are forged hot isodiametric pressing (HIP), and the forging process has a large material loss and complicated process; ( 2) The billet before rolling used by Chen Yuyong et al. is the ingot prepared by the melting casting method. When the TiAl-based alloy ingot is prepared by the melting casting method, the melting and casting process requires high equipment, and the large-sized billet is easy to crack and is very difficult to prepare. Therefore, the ingot The size is small, and it is impossible to prepare large-size alloy sheets

At present, there is no relevant literature report on the process of directly rolling the Ti-Al-Cr-Mo alloy billet prepared by powder metallurgy without forging

Images