Cryogenic turning of Ti-15Mo alloy

Author(s)

Rubio, Juan C. C. ; Ricci, Virgilio P. ; Rodrigues, Alessandro R. ; Kliauga, Andrea M. ; Ventura, Carlos E. H.

• Document type: Journal article
• Source: INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY; v. 137, n. 7-8, p. 13-pg., 2025-03-24.

Abstract

Titanium alloys face challenges in machinability due to intrinsic properties such as high hardness (even at elevated temperatures), chemical affinity with various tool materials, and low thermal conductivity. Research has been mainly focused on improving the machining processes of titanium and its alloys in terms of tool life, surface quality, and productivity. Therefore, this study determines and explains the influence of the lubri-cooling environment on tool performance and surface characteristics in turning Ti-15Mo alloy at different cutting speeds. Not only wear types and mechanisms were assessed, but also the workpiece surface roughness and hardness. Cutting experiments were conducted in dry, wet, and cryogenic environments for comparison purposes. Results showed that liquid nitrogen delays tool wear more effectively than flood coolant. Additionally, material adhesion from the workpiece to the tool surface was observed in all cases, which, depending on the cutting speed, tended to either preserve or accelerate insert wear, potentially causing tool failure. Regarding the workpiece material characteristics, strain hardening occurred indistinctly for all cutting conditions, due to the occurrence of mechanical twinning. (AU)

• FAPESP's process: 15/15622-2 - Influence of grinding parameters in the manufacturing of cemented tungsten carbide inserts on their performance in turning of a titanium alloy
• Grantee: Carlos Eiji Hirata Ventura
• Support Opportunities: Research Grants - Young Investigators Grants
• FAPESP's process: 17/12304-5 - Multi-user equipment approved in grant 15/15622-2: CNC grinding machine for cutting insert preparation
• Grantee: Carlos Eiji Hirata Ventura
• Support Opportunities: Multi-user Equipment Program
• FAPESP's process: 17/12309-7 - Multi-user equipment approved in grant 15/15622-2: microscope for three-dimensional image analysis
• Grantee: Carlos Eiji Hirata Ventura
• Support Opportunities: Multi-user Equipment Program
• FAPESP's process: 18/24614-1 - Plan of Implementation of the Year 2018 Technical Reserve Parcel (Base 2017) for Infrastructure Institutional Costs Center for Physical Sciences and Technology (CCET) UFSCAR
• Grantee: Luiz Fernando de Oriani e Paulillo
• Support Opportunities: Research Grants - Technical Reserve for Institutional Research Infrastructure