Effect of Resistance Hot Rolling on HCF Properties of TC17 Titanium Alloy Repaired Zone

LI Xiang; JIANG Lili; YU Huishu; YOU Jiaqing

doi:10.3969/j.issn.1674-6457.2026.01.013

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Journal of Netshape Forming Engineering ›› 2026, Vol. 18 ›› Issue (1) : 140-148. DOI: 10.3969/j.issn.1674-6457.2026.01.013

Advanced Joining Technology

Effect of Resistance Hot Rolling on HCF Properties of TC17 Titanium Alloy Repaired Zone

LI Xiang, JIANG Lili, YU Huishu, YOU Jiaqing^*

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Abstract

The work aims to study the key technical issues of TC17 alloy blisk repair. The resistance hot rolling with different parameters was used to impact the TC17 titanium alloy repaired zone and the effectiveness of the resistance hot rolling process to eliminate defects and improve high cycle fatigue performance was verified with X-ray three-dimensional imaging test, microstructure analysis and high cycle fatigue test. The results of X-ray three-dimensional imaging test showed that the elimination rate of defects such as pores in the distinguishable range was 100% under 6 000 A and 7 000 A current parameters. The results of SEM showed that there was a “trigeminal stick” at the bottom of the pores, which was related to extrusion, diffusion and recrystallization. The results of rotary bending fatigue test showed that after resistance hot rolling, the rotary bending fatigue life of the TC17 alloy repaired zone was significantly improved, with a median fatigue limit of 586 MPa, reaching 178.8% of the median fatigue limit of the original weld repaired zone and 104.8% of that of the TC17 alloy base material. Treating the TC17 alloy surfacing repair area through the resistance hot rolling process can eliminate the pores inside the workpiece and greatly improve the fatigue properties of the surfacing area and TC17 alloy base material. This study provides process support and theoretical basis for the overall blisk repair of aeroengines.

Key words

resistance hot rolling / repairing of blisks / elimination rates of pores / high cycle fatigue / microstructures

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LI Xiang, JIANG Lili, YU Huishu, YOU Jiaqing. Effect of Resistance Hot Rolling on HCF Properties of TC17 Titanium Alloy Repaired Zone[J]. Journal of Netshape Forming Engineering. 2026, 18(1): 140-148 https://doi.org/10.3969/j.issn.1674-6457.2026.01.013

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