Over-9-ton extra-large-specification high-impact-toughness Ti80 titanium alloy forging stock and manufacturing method thereof

Through the comprehensive process of open forging, intermediate forging and finished product forging, combined with the control of upsetting and cooling methods, the problems of uneven structure and insufficient impact toughness of the ultra-large-spec Ti80 titanium alloy forging blanks are solved, and the effect of efficient preparation of high-performance forging blanks is achieved.

CN119839210AActive Publication Date: 2025-04-18宝武特种冶金有限公司
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Patent Information

Application Number
CN202510315193.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-03-18
Publication Date
2025-04-18
Estimated Expiration
2045-03-18

AI Technical Summary

Technical Problem

It is difficult to effectively prepare Ti80 titanium alloy forging forged in titanium alloy of 9 tons or above in the prior art, and there are problems such as uneven structure, poor forging permeability of the core part of the material, and insufficient impact toughness.

Method used

The comprehensive process of open forging, intermediate forging and finished product forging is adopted. By controlling the upsetting method, deformation amount, cooling method, etc., it ensures that the deformation amount per fire is 30~55%, and the total deformation amount is ≥50%. The air-cooling treatment is carried out in the single-phase area to refine the precipitated sheet structure.

Benefits of technology

The structure uniformity and impact toughness of the Ti80 titanium alloy forging billet of extra-large specifications of 9 tons have been improved, which avoids material cracking and improves the yield rate. The tensile strength, yield strength, elongation and impact work of the forging billet have reached high standards.

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Abstract

The invention discloses a high-impact-toughness Ti80 titanium alloy forging stock with the extra-large specification of more than 9 tons and a manufacturing method. The manufacturing method comprises the following steps: S1) adopting a Ti80 titanium alloy cast ingot with the diameter of 960-1060 mm and the weight of 9-17 tons; (S2) cogging and forging are conducted, the cast ingot is subjected to upsetting and drawing for 2-5 heating numbers in a beta-phase region, and the upsetting and drawing deformation of each heating number is 30-55%; (S3) intermediate forging is conducted, specifically, the blank is subjected to 3-4 heating number upsetting and drawing in a beta-phase region, the upsetting and drawing deformation of each heating number is 30-55%, and air cooling is conducted after upsetting and drawing; and (S4) finished product forging is conducted, 3-5 heating number drawing is conducted at the temperature 30-60 DEG C below the phase transformation point, the deformation of each heating number is 10-30%, and the total deformation is larger than or equal to 50%. The thickness of the obtained forging stock is 200-500 mm, the width is 1000-2500 mm, the length is 2000-4000 mm, and after the forging stock is annealed, the tensile strength of each position is larger than or equal to 840 MPa, the yield strength is larger than or equal to 740 MPa, the ductility is larger than or equal to 10%, and the impact energy is larger than 60 J. And the obtained forging stock is uniform in structure, the material is not cracked in the forging process, and the yield and the impact toughness after annealing are improved.
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