مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

اثر پیرسازی تک‌مرحله‌ای و دومرحله‌ای بر ریزساختار و خواص مکانیکی آلیاژ نوین Ti-3Al-8Mo-7V-3Cr

نوع مقاله : پژوهشی اصیل

نویسندگان
مریم مرکباتی 1
حسین ساکی 2
رشید مهدوی 3
1 دانشیار دانشگاه صنعتی مالک اشتر
2 دانشجو دانشگاه صنعتی مالک اشتر
3 محقق دانشگاه صنعتی مالک اشتر
10.52547/mme.23.3.199
چکیده
آلیاژهای تیتانیوم شبه‌پایدار بتا به دلیل دارا بودن استحکام بالا و انعطاف‌پذیری مناسب و همچنین نسبت استحکام به وزن بالا جهت کاربرد در صنعت هوافضا مناسب می‌باشند. هدف از پژوهش حاضر بررسی ریزساختار و خواص کششی حاصل از پیرسازی تک‌مرحله‌ای و دومرحله‌ای پس از چرخه های مکانیکی حرارتی آنیل تک‌فاز β و آنیل دوفاز α+β در آلیاژ نوین Ti-3Al-8Mo-7V-3Cr است. به این منظور، روی یک تسمه از این آلیاژ، عملیات‌ حرارتی آنیل انحلالی در منطقه تک‌فاز β، نورد سرد و تبلورمجدد و بر روی تسمه دیگر، عملیات‌ حرارتی آنیل انحلالی در منطقه دو‌فاز α+β انجام شد. سپس، نمونه‌هایی از این تسمه‌ها در دمای 550 درجه سانتی گراد تحت عملیات پیرسازی تک‌ مرحله‌ای قرار گرفت. همچنین جهت انجام عملیات‌ پیرسازی دو‌مرحله‌ای، نمونه‌هایی در دمای 300 و 550 درجه سانتی‌گراد به ترتیب جهت پیرسازی اولیه و ثانویه تحت عملیات حرارتی قرار گرفتند. پس‌از آن، تحولات ساختاری آلیاژ بوسیله‌ی میکروسکوپ الکترونی روبشی و تفرق اشعه‌ی ایکس و خواص کششی بوسیله‌ی آزمایش کشش سرد ‌مورد بررسی قرار گرفت. نتایج نشان داد، سیکل بهینه عملیات حرارتی آلیاژ Ti-3873، پیرسازی دومرحله‌ای پس از آنیل در منطقه دوفاز α+β است که منجر به دستیابی به استحکام تسلیم 1190 مگاپاسکال و ازدیادطول 7/14% شد. در این حالت، ساختار بدست آمده فاقد آلفای مرزدانه‌ای بوده و آلفای ثانویه تشکیل شده دارای طول کمتر از 5/0 میکرومتر و میانگین ضخامت آن 15/0 میکرومتر می‌باشد.
کلیدواژه‌ها
آلیاژ Ti-3Al-8Mo-7V-3Cr
آنیل تک‌فاز β
آنیل دوفاز α+β
پیرسازی دومرحله‌ای
ریزساختار
خواص کششی

موضوعات

عنوان مقاله English

The effect of single-step and two-step aging on the microstructure and mechanical properties of the novel Ti-3Al-8Mo-7V-3Cr alloy

نویسندگان English

Maryam Morakabati 1
H. Saki 2
R. Mahdavi 3
1 Associate Professor
2 Student
3 Researcher
چکیده English

Metastable beta titanium alloys are suitable for use in the aerospace industry due to their high strength and good ductility, as well as their high strength-to-weight ratio. The aim of the current research is to investigate the microstructure and tensile properties of the alloy after single-step and two-step aging following thermal-mechanical cycles of single-phase β annealing and two-phase α+β annealing. For this purpose, on one strip of the alloy, solution annealing heat treatment in the single-phase β region, cold rolling and recrystallization and on the other strip, solution annealing heat treatment in the two-phase α+β region was performed. Afterwards, the specimens from the strips were subjected to single-step aging at 550⸰C. In addition, in order to perform two-step aging, specimens were subjected to heat treatment at 300 and 550⸰C for primary and secondary aging, respectively. Then the structural evolution of the alloy was investigated by SEM and X-ray diffraction pattern and the tensile properties of it by tensile test. It was found that the optimum heat treatment cycle of the Ti-3873 alloy was two-step aging after α+β solution treatment leading to 1190 MPa yield strength and 14.7% elongation. In this case, the obtained structure has no grain boundary alpha and the formed secondary alpha has a length of less than 0.5 µm and its average thickness is 0.15 µm.

کلیدواژه‌ها English

Ti-3Al-8Mo-7V-3Cr alloy
Single-phase β annealing
Two-phase α+β annealing
Two-step aging
Microstructure
Tensile properties
[1] Cotton JD, Briggs RD, Boyer RR, Tamirisakandala S, Russo P, Shchetnikov N, Fanning JC. State of the art in beta titanium alloys for airframe applications. Jom. 2015 Jun;67(6):1281-303. [DOI:10.1007/s11837-015-1442-4]
[1] Cotton JD, Briggs RD, Boyer RR, Tamirisakandala S, Russo P, Shchetnikov N, Fanning JC. State of the art in beta titanium alloys for airframe applications. Jom. 2015 Jun;67(6):1281-303. [DOI:10.1007/s11837-015-1442-4]
[2] Froes FH, Yolton CF, Capenos JM, Wells MG, Williams JC. The relationship between microstructure and age hardening response in the metastable beta titanium alloy Ti-11.5 Mo-6 Zr-4.5 Sn (beta III). Metallurgical and Materials Transactions A. 1980 Dec;11(1):21-31. [DOI:10.1007/BF02700435]
[2] Froes FH, Yolton CF, Capenos JM, Wells MG, Williams JC. The relationship between microstructure and age hardening response in the metastable beta titanium alloy Ti-11.5 Mo-6 Zr-4.5 Sn (beta III). Metallurgical and Materials Transactions A. 1980 Dec;11(1):21-31. [DOI:10.1007/BF02700435]
[3] Ivasishin OM, Markovsky PE, Matviychuk YV, Semiatin SL. Precipitation and recrystallization behavior of beta titanium alloys during continuous heat treatment. Metallurgical and Materials Transactions A. 2003 Jan;34(1):147-58. [DOI:10.1007/s11661-003-0216-8]
[3] Ivasishin OM, Markovsky PE, Matviychuk YV, Semiatin SL. Precipitation and recrystallization behavior of beta titanium alloys during continuous heat treatment. Metallurgical and Materials Transactions A. 2003 Jan;34(1):147-58. [DOI:10.1007/s11661-003-0216-8]
[4] Santhosh R, Geetha M, Nageswara Rao M. Recent developments in heat treatment of beta titanium alloys for aerospace applications. Transactions of the Indian Institute of Metals. 2017 Sep;70(7):1681-8. [DOI:10.1007/s12666-016-0985-6]
[4] Santhosh R, Geetha M, Nageswara Rao M. Recent developments in heat treatment of beta titanium alloys for aerospace applications. Transactions of the Indian Institute of Metals. 2017 Sep;70(7):1681-8. [DOI:10.1007/s12666-016-0985-6]
[5] Lütjering G, Williams JC. Beta alloys. Titanium. 2007:283-336. [DOI:10.1002/3527607285.ch48]
[5] Lütjering G, Williams JC. Beta alloys. Titanium. 2007:283-336. [DOI:10.1002/3527607285.ch48]
[6] Weiss I, Semiatin SL. Thermomechanical processing of beta titanium alloys-an overview. Materials Science and Engineering: A. 1998 Mar 15;243(1-2):46-65. [DOI:10.1016/S0921-5093(97)00783-1]
[6] Weiss I, Semiatin SL. Thermomechanical processing of beta titanium alloys-an overview. Materials Science and Engineering: A. 1998 Mar 15;243(1-2):46-65. [DOI:10.1016/S0921-5093(97)00783-1]
[7] Ivasishin OM, Markovsky PE, Matviychuk YV, Semiatin SL, Ward CH, Fox S. A comparative study of the mechanical properties of high-strength β-titanium alloys. Journal of alloys and compounds. 2008 Jun 12;457(1-2):296-309. [DOI:10.1016/j.jallcom.2007.03.070]
[7] Ivasishin OM, Markovsky PE, Matviychuk YV, Semiatin SL, Ward CH, Fox S. A comparative study of the mechanical properties of high-strength β-titanium alloys. Journal of alloys and compounds. 2008 Jun 12;457(1-2):296-309. [DOI:10.1016/j.jallcom.2007.03.070]
[8] Nyakana SL, Fanning JC, Boyer RR. Quick reference guide for β titanium alloys in the 00s. Journal of Materials Engineering and Performance. 2005 Dec;14(6):799-811. [DOI:10.1361/105994905X75646]
[8] Nyakana SL, Fanning JC, Boyer RR. Quick reference guide for β titanium alloys in the 00s. Journal of Materials Engineering and Performance. 2005 Dec;14(6):799-811. [DOI:10.1361/105994905X75646]
[9] Sadeghpour S, Abbasi SM, Morakabati M. Design of a new multi-element beta titanium alloy based on d-electron method. InTMS Annual Meeting & Exhibition 2018 Mar 11 (pp. 377-386). Springer, Cham. [DOI:10.1007/978-3-319-72526-0_36]
[9] Sadeghpour S, Abbasi SM, Morakabati M. Design of a new multi-element beta titanium alloy based on d-electron method. InTMS Annual Meeting & Exhibition 2018 Mar 11 (pp. 377-386). Springer, Cham. [DOI:10.1007/978-3-319-72526-0_36]
[10] Sadeghpour S, Abbasi SM, Morakabati M, Kisko A, Karjalainen LP, Porter DA. On the compressive deformation behavior of new beta titanium alloys designed by d-electron method. Journal of Alloys and Compounds. 2018 May 25;746:206-17. [DOI:10.1016/j.jallcom.2018.02.212]
[10] Sadeghpour S, Abbasi SM, Morakabati M, Kisko A, Karjalainen LP, Porter DA. On the compressive deformation behavior of new beta titanium alloys designed by d-electron method. Journal of Alloys and Compounds. 2018 May 25;746:206-17. [DOI:10.1016/j.jallcom.2018.02.212]
[11] Saki H, Morakabati M, Mahdavi R. "Investigating the effect of cold rolling and heat treatment on the recrystallization behavior and mechanical properties of the novel metastable beta titanium alloy Ti-3Al-8Mo-7V-3Cr," presented at the 9th International Conference & Exhibition on Materials science & Metallurgical engineering, 2020. Available: https://civilica.com/doc/1133578
[11] Saki H, Morakabati M, Mahdavi R. "Investigating the effect of cold rolling and heat treatment on the recrystallization behavior and mechanical properties of the novel metastable beta titanium alloy Ti-3Al-8Mo-7V-3Cr," presented at the 9th International Conference & Exhibition on Materials science & Metallurgical engineering, 2020. Available: https://civilica.com/doc/1133578
[12] Gammon LM, Briggs RD, Packard JM, Batson KW, Boyer R, Domby CW. Metallography and microstructures of titanium and its alloys. ASM handbook. 2004;9:899-917. [DOI:10.31399/asm.hb.v09.a0003779]
[12] Gammon LM, Briggs RD, Packard JM, Batson KW, Boyer R, Domby CW. Metallography and microstructures of titanium and its alloys. ASM handbook. 2004;9:899-917. [DOI:10.31399/asm.hb.v09.a0003779]
[13] ASTM E. 8M. Standard Test Methods of Tension Testing of Metallic Materials (Metric), Annual Book of ASTM Standards. InAm Soc Testing Mater 1999 (Vol. 3, p. 01).
[13] ASTM E. 8M. Standard Test Methods of Tension Testing of Metallic Materials (Metric), Annual Book of ASTM Standards. InAm Soc Testing Mater 1999 (Vol. 3, p. 01).
[14] He T, Feng Y, Luo W, He Y, Tian L, Lai Y. Microstructural evolution of ω assisted α precipitates in β-CEZ alloy during ageing process. Materials Characterization. 2018 Apr 1;138:19-25. [DOI:10.1016/j.matchar.2018.01.056]
[14] He T, Feng Y, Luo W, He Y, Tian L, Lai Y. Microstructural evolution of ω assisted α precipitates in β-CEZ alloy during ageing process. Materials Characterization. 2018 Apr 1;138:19-25. [DOI:10.1016/j.matchar.2018.01.056]
[15] Porter DA, Easterling KE. Phase transformations in metals and alloys (revised reprint). CRC press; 2009 Feb 10. [DOI:10.1201/9781439883570]
[15] Porter DA, Easterling KE. Phase transformations in metals and alloys (revised reprint). CRC press; 2009 Feb 10. [DOI:10.1201/9781439883570]
[16] Shewmon P, editor. Diffusion in solids. Springer; 2016 Dec 6. [DOI:10.1007/978-3-319-48206-4]
[16] Shewmon P, editor. Diffusion in solids. Springer; 2016 Dec 6. [DOI:10.1007/978-3-319-48206-4]
[17] Yolton CF, Froes FH, Malone RF. Alloying element effects in metastable beta titanium alloys. Metallurgical Transactions A. 1979 Jan;10(1):132-4. [DOI:10.1007/BF02686421]
[17] Yolton CF, Froes FH, Malone RF. Alloying element effects in metastable beta titanium alloys. Metallurgical Transactions A. 1979 Jan;10(1):132-4. [DOI:10.1007/BF02686421]
[18] Sadeghpour S, Abbasi SM, Morakabati M, Bruschi S. Correlation between alpha phase morphology and tensile properties of a new beta titanium alloy. Materials & Design. 2017 May 5;121:24-35. [DOI:10.1016/j.matdes.2017.02.043]
[18] Sadeghpour S, Abbasi SM, Morakabati M, Bruschi S. Correlation between alpha phase morphology and tensile properties of a new beta titanium alloy. Materials & Design. 2017 May 5;121:24-35. [DOI:10.1016/j.matdes.2017.02.043]
[19] Saki H, Morakabati M, Mahdavi R. EFFECT OF THE TWO-PHASE SOLUTION ANNEALING AND AGING ON ALPHA PRECIPITATES AND TENSILE PROPERTIES OF Ti-3Al-8Mo-7V-3Cr ALLOY. Journal of Advanced Materials in Engineering (Esteghlal). 2021 Nov 10;40(3):43-59. [DOI:10.47176/jame.40.3.22124]
[19] Saki H, Morakabati M, Mahdavi R. EFFECT OF THE TWO-PHASE SOLUTION ANNEALING AND AGING ON ALPHA PRECIPITATES AND TENSILE PROPERTIES OF Ti-3Al-8Mo-7V-3Cr ALLOY. Journal of Advanced Materials in Engineering (Esteghlal). 2021 Nov 10;40(3):43-59. [DOI:10.47176/jame.40.3.22124]
[20] Dieter GE. Mechanical Metallurgy, Mc Graw Hill Book. New York (1988). 1986.
[20] Dieter GE. Mechanical Metallurgy, Mc Graw Hill Book. New York (1988). 1986.
[21] Song, Z.Y., Sun, Q.Y., Xiao, L., Liu, L. and Sun, J. Effect of prestrain and aging treatment on microstructures and tensile properties of Ti-10Mo-8V-1Fe-3.5 Al alloy. Materials Science and Engineering: A. 2010 Jan 15;527(3):691-8. [DOI:10.1016/j.msea.2009.09.046]
[21] Song, Z.Y., Sun, Q.Y., Xiao, L., Liu, L. and Sun, J. Effect of prestrain and aging treatment on microstructures and tensile properties of Ti-10Mo-8V-1Fe-3.5 Al alloy. Materials Science and Engineering: A. 2010 Jan 15;527(3):691-8. [DOI:10.1016/j.msea.2009.09.046]
مهندسی مکانیک مدرس
دوره 23، شماره 3
اسفند 1401
صفحه 199-208