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<p>Correlation dependences between diamond ball burnishing parameters (load and number of passes) and surface characteristics (surface topography, microhardness, roughness, depth and structure of the deformed surface layer) of high-strength VT22 (Ti–5Al–5Mo–5V–1.5Cr–Fe) titanium alloy were investigated. A&#xa0;high-strength titanium alloy with different initial structures (single-phase&#xa0;β- and two-phase (α+β)-lamellar and globular structures) was studied. It was shown that the load during ball burnishing, regardless of the alloy structural state, should not exceed 400&#xa0;N due to the decrease in surface quality caused by the delamination of the surface layers. When the ball burnishing load grows from 100 to 400&#xa0;N, the surface microhardness of the alloy with the initial two-phase structure increases due to the decrease in the grain size of the α‑phase in the surface layer. On the other hand, the alloy with the initial single β‑structure is less suitable for such treatment. As for the influence of the number of passes, when they were increased, regardless of the initial structural state, the micro-relief of the titanium alloy surface improved due to the increased smoothing of grooves, but this had little effect on the surface hardening.</p>

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The influence of the initial structure of high-strength titanium alloy on surface hardening and roughness after ball burnishing

  • 期刊论文

  • 发表日期：

    2025年5月1日

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  • S. M. Lavrys,
  • I. M. Pohrelyuk,
  • S. Ye. Sheykin,
  • I. Yu. Rostotskyi

摘要

Correlation dependences between diamond ball burnishing parameters (load and number of passes) and surface characteristics (surface topography, microhardness, roughness, depth and structure of the deformed surface layer) of high-strength VT22 (Ti–5Al–5Mo–5V–1.5Cr–Fe) titanium alloy were investigated. A high-strength titanium alloy with different initial structures (single-phase β- and two-phase (α+β)-lamellar and globular structures) was studied. It was shown that the load during ball burnishing, regardless of the alloy structural state, should not exceed 400 N due to the decrease in surface quality caused by the delamination of the surface layers. When the ball burnishing load grows from 100 to 400 N, the surface microhardness of the alloy with the initial two-phase structure increases due to the decrease in the grain size of the α‑phase in the surface layer. On the other hand, the alloy with the initial single β‑structure is less suitable for such treatment. As for the influence of the number of passes, when they were increased, regardless of the initial structural state, the micro-relief of the titanium alloy surface improved due to the increased smoothing of grooves, but this had little effect on the surface hardening.