Abstract
Titanium alloy Ti1023 is a typical difficult-to-cut material. Tool wear is easy to occur in machining Ti1023, which has a significant negative effect on surface integrity. Turning is one of the common methods to machine Ti1023 parts and machined surface integrity has a direct influence on the fatigue life of parts. To control surface integrity and improve anti-fatigue behavior of Ti1023 parts, it has an important significance to study the influence of tool wear on the surface integrity and fatigue life of Ti1023 in turning. Therefore, the effect of tool wear on the surface roughness, microhardness, residual stress, and plastic deformation layer of Ti1023 workpieces by turning and low-cycle fatigue tests were studied. Meanwhile, the influence mechanism of surface integrity on anti-fatigue behavior also was analyzed. The experimental results show that the change of surface roughness caused by worn tools has the most influence on anti-fatigue behavior when the tool wear VB is from 0.05 to 0.25 mm. On the other hand, the plastic deformation layer on the machined surface could properly improve the anti-fatigue behavior of specimens that were proved in the experiments. However, the higher surface roughness and significant surface defects on surface machined utilizing the worn tool with VB = 0.30 mm, which leads the anti-fatigue behavior of specimens to decrease sharply. Therefore, to ensure the anti-fatigue behavior of parts, the value of turning tool wear VB must be rigorously controlled under 0.30 mm during finishing machining of titanium alloy Ti1023.
Highlights
Titanium alloy Ti1023 has been widely used in the aviation and aerospace manufacturing field due to it has the indicators of high strength, low density, and corrosion resistance
Ti1023 is a typical difficult-to-cut material, the tool wear is an unavoidable phenomenon occurring in the machining process, which has a significant influence on machined surface integrity of parts.[1,2]
From the analysis of the influence of surface integrity on anti-fatigue behavior of specimens which machine by different worn tools, the conclusion that plastic deformation layer on the machined surface is beneficial to improve anti-fatigue behavior of specimens is obtained in the experiments
Summary
Titanium alloy Ti1023 has been widely used in the aviation and aerospace manufacturing field due to it has the indicators of high strength, low density, and corrosion resistance. The increased cutting temperature leads to Ti1023 appearing micro-melting states, which enhances the effects of rubbing and ironing between tool and workpiece, and causes the surface roughness to decrease.
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