Effect of Equal Channel Angular Pressing on the Dynamic Softening Behavior of Ti-6Al-4V Alloy in the Hot Deformation Process
To investigate the effect of equal channel angular pressing (ECAP) on the deformation of Ti-6Al-4V alloy at a higher temperature, hot compression tests were conducted on alloys having two different initial microstructures (the original alloy (Pre-ECAP) and ECAP-deformed alloy (Post-ECAP)). Post-ECAP...
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| author | Zhiyong Zhao Jun Gao Yaoqi Wang Yanling Zhang Hongliang Hou |
| author_facet | Zhiyong Zhao Jun Gao Yaoqi Wang Yanling Zhang Hongliang Hou |
| author_sort | Zhiyong Zhao |
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| description | To investigate the effect of equal channel angular pressing (ECAP) on the deformation of Ti-6Al-4V alloy at a higher temperature, hot compression tests were conducted on alloys having two different initial microstructures (the original alloy (Pre-ECAP) and ECAP-deformed alloy (Post-ECAP)). Post-ECAP, the alloy showed a higher degree of dynamic softening during the hot deformation process due to its finer grain size and higher distortion energy. The flow stress of Post-ECAP alloy was higher than the Pre-ECAP alloy at 500 °C when <inline-formula><math display="inline"><semantics><mrow><mover accent="true"><mi>ε</mi><mo>˙</mo></mover><mo>=</mo><mtext> </mtext><mn>0.003</mn><msup><mrow><mrow><mo> </mo><mi mathvariant="normal">s</mi></mrow></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></mrow></semantics></math></inline-formula>. However, the stress of the Post-ECAP alloy decreased rapidly with increasing temperature and strain rate, until the stress value was much lower than that of Pre-ECAP at 700 °C when <inline-formula><math display="inline"><semantics><mrow><mover accent="true"><mi>ε</mi><mo>˙</mo></mover><mo>=</mo><mo> </mo><mn>0.03</mn><mo> </mo><msup><mi mathvariant="normal">s</mi><mrow><mo>−</mo><mn>1</mn></mrow></msup></mrow></semantics></math></inline-formula>. The value of the dynamic softening coefficient revealed that the dynamic softening behavior of Post-ECAP was more pronounced than that of Pre-ECAP in the hot compression deformation process. The main dynamic softening mechanism of Pre-ECAP is dynamic recovery, while the dynamic recrystallization process plays a more important role in the deformation process of Post-ECAP alloy. The microstructures observation results showed that dynamic recrystallization was more likely to occur to Post-ECAP alloys under the same deformation condition. Almost fully dynamic recrystallization had occurred in the deformation process of Post-ECAP at 700 °C and a strain rate of <inline-formula><math display="inline"><semantics><mrow><mover accent="true"><mi>ε</mi><mo>˙</mo></mover><mo>=</mo><mo> </mo><mn>0.01</mn><mo> </mo><msup><mi mathvariant="normal">s</mi><mrow><mo>−</mo><mn>1</mn></mrow></msup></mrow></semantics></math></inline-formula>. The grains of Post-ECAP alloys were further refined. The Post-ECAP alloy exhibits better plastic deformation at temperatures higher than 600 °C due to its significant dynamic recrystallization. |
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| spelling | doaj.art-a617c0d022c6413e818d47d12f0acdc02023-11-21T08:34:34ZengMDPI AGMaterials1996-19442021-01-0114123210.3390/ma14010232Effect of Equal Channel Angular Pressing on the Dynamic Softening Behavior of Ti-6Al-4V Alloy in the Hot Deformation ProcessZhiyong Zhao0Jun Gao1Yaoqi Wang2Yanling Zhang3Hongliang Hou4School of Mechanical, Electrical and Information Engineering, Shandong University (Weihai), Weihai 264209, ChinaSchool of Mechanical, Electrical and Information Engineering, Shandong University (Weihai), Weihai 264209, ChinaAVIC Manufacturing Technology Institute, Beijing 100024, ChinaAVIC Manufacturing Technology Institute, Beijing 100024, ChinaAVIC Manufacturing Technology Institute, Beijing 100024, ChinaTo investigate the effect of equal channel angular pressing (ECAP) on the deformation of Ti-6Al-4V alloy at a higher temperature, hot compression tests were conducted on alloys having two different initial microstructures (the original alloy (Pre-ECAP) and ECAP-deformed alloy (Post-ECAP)). Post-ECAP, the alloy showed a higher degree of dynamic softening during the hot deformation process due to its finer grain size and higher distortion energy. The flow stress of Post-ECAP alloy was higher than the Pre-ECAP alloy at 500 °C when <inline-formula><math display="inline"><semantics><mrow><mover accent="true"><mi>ε</mi><mo>˙</mo></mover><mo>=</mo><mtext> </mtext><mn>0.003</mn><msup><mrow><mrow><mo> </mo><mi mathvariant="normal">s</mi></mrow></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></mrow></semantics></math></inline-formula>. However, the stress of the Post-ECAP alloy decreased rapidly with increasing temperature and strain rate, until the stress value was much lower than that of Pre-ECAP at 700 °C when <inline-formula><math display="inline"><semantics><mrow><mover accent="true"><mi>ε</mi><mo>˙</mo></mover><mo>=</mo><mo> </mo><mn>0.03</mn><mo> </mo><msup><mi mathvariant="normal">s</mi><mrow><mo>−</mo><mn>1</mn></mrow></msup></mrow></semantics></math></inline-formula>. The value of the dynamic softening coefficient revealed that the dynamic softening behavior of Post-ECAP was more pronounced than that of Pre-ECAP in the hot compression deformation process. The main dynamic softening mechanism of Pre-ECAP is dynamic recovery, while the dynamic recrystallization process plays a more important role in the deformation process of Post-ECAP alloy. The microstructures observation results showed that dynamic recrystallization was more likely to occur to Post-ECAP alloys under the same deformation condition. Almost fully dynamic recrystallization had occurred in the deformation process of Post-ECAP at 700 °C and a strain rate of <inline-formula><math display="inline"><semantics><mrow><mover accent="true"><mi>ε</mi><mo>˙</mo></mover><mo>=</mo><mo> </mo><mn>0.01</mn><mo> </mo><msup><mi mathvariant="normal">s</mi><mrow><mo>−</mo><mn>1</mn></mrow></msup></mrow></semantics></math></inline-formula>. The grains of Post-ECAP alloys were further refined. The Post-ECAP alloy exhibits better plastic deformation at temperatures higher than 600 °C due to its significant dynamic recrystallization.https://www.mdpi.com/1996-1944/14/1/232titanium alloyequal channel angular pressinghot deformation behaviordynamic softening |
| spellingShingle | Zhiyong Zhao Jun Gao Yaoqi Wang Yanling Zhang Hongliang Hou Effect of Equal Channel Angular Pressing on the Dynamic Softening Behavior of Ti-6Al-4V Alloy in the Hot Deformation Process Materials titanium alloy equal channel angular pressing hot deformation behavior dynamic softening |
| title | Effect of Equal Channel Angular Pressing on the Dynamic Softening Behavior of Ti-6Al-4V Alloy in the Hot Deformation Process |
| title_full | Effect of Equal Channel Angular Pressing on the Dynamic Softening Behavior of Ti-6Al-4V Alloy in the Hot Deformation Process |
| title_fullStr | Effect of Equal Channel Angular Pressing on the Dynamic Softening Behavior of Ti-6Al-4V Alloy in the Hot Deformation Process |
| title_full_unstemmed | Effect of Equal Channel Angular Pressing on the Dynamic Softening Behavior of Ti-6Al-4V Alloy in the Hot Deformation Process |
| title_short | Effect of Equal Channel Angular Pressing on the Dynamic Softening Behavior of Ti-6Al-4V Alloy in the Hot Deformation Process |
| title_sort | effect of equal channel angular pressing on the dynamic softening behavior of ti 6al 4v alloy in the hot deformation process |
| topic | titanium alloy equal channel angular pressing hot deformation behavior dynamic softening |
| url | https://www.mdpi.com/1996-1944/14/1/232 |
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