تأثیر فرایند کوئنچ و پارتیشن‌بندی بر ساختار و خواص مکانیکی فولاد AISI 4130

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی مواد، دانشگاه صنعتی مالک ‌اشتر، ایران

چکیده

در پژوهش حاضر تأثیر عملیات حرارتی کوئنچ و پارتیشن‌بندی بر ریزساختار و خواص مکانیکی فولاد AISI 4130 مورد بررسی قرار گرفته است. فرایند مورد بحث در دمای کوئنچ 270 درجه سانتی‌گراد و سه دمای پارتیشن‌بندی 270، 330 و 380 درجه سانتی‌گراد دنبال شد. مشخصه‌یابی ساختار فازی نمونه‌های حاصل توسط آزمون‌های پراش‌سنج پرتو ایکس و میکروسکوپی الکترونی روبشی انجام شد. خواص مکانیکی نمونه‌ها نیز توسط آزمون سختی‌سنجی و آزمون کشش طبق استاندارد  ASTM E8 دنبال شد. نتایج حاصل نشان داد که با انجام فرایند کوئنچ و پارتیشن‌بندی در فولاد AISI 4130 با حفظ درصد ازدیاد طول (در حدود 9/6 درصد)، استحکام کششی تا حدود 1450 مگاپاسکال قابل افزایش است. این مقدار افزایش، در حدود 20 درصد بیشتر از استحکام حاصل از فرایند معمول کوئنچ و تمپر در مورد این فولاد است. شرایط بهینه عملیات کوئنچ و پارتیشن‌بندی، دمای پارتیشن‌بندی 330 درجه سانتی‌گراد و زمان 120 دقیقه تعیین شد. انجام پارتیشن‌بندی در دماهای پایین‌تر قادر به پایدارسازی فاز آستنیت نبوده، پارتیشن‌بندی در دماهای بالاتر تجزیه آستنیت و رسوب کاربید را به دنبال دارد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

The Effect of Quenching and Partitioning (Q&P) Process on the Structural and Mechanical Properties of AISI 4130 Steel

نویسندگان [English]

  • S. Hossain Reza
  • M. Tavoosi
  • M.R. Dehnavi
Department of Materials Engineering, Malek- Ashtar University of Technology, Shahin-Shahr, Isfahan, Iran
چکیده [English]

In this study, the effect of quenching and partitioning (Q&P) heat treatment on the structural and mechanical properties of AISI 4130 steel was investigated. The Q&P process was followed at a quench temperature of 270 oC and three different partitioning temperatures of 270, 330, and 380 oC. The phase and structural characterization of the prepared spicimens were done using X-ray diffractometer (XRD) and scanning electron microscopy (SEM), respectively. The mechanical properties of the samples were also monitored by hardness and tensile test according to ASTM E8 standard. The results showed that the tensile strength can be increased up to 1450 MPa while maintaining the elongation percentage (about 9.6%) by performing the Q&P process on the AISI 4130 steel. This strength is about 20% greater than that of obtained by the usual quench and tempering process in this steel. Optimum partitioning temperature and time for AISI 4130 steel were determined to be 330 °C and 120 minutes, respectivly. Partitioning at lower temperatures could not stabilize the austenite phase, while partitioning at higher temperatures caused the decomposition of the austenite phase and carbide precipitation.

کلیدواژه‌ها [English]

  • Quenching and partitioning
  • AISI 4130 steel
  • Mechanical properties
  • Microtructure
  • Austenite
  1. Nguyen MT, Santofimia MJ, Sietsma J, Zhao L. Quenching and partitioning of low alloyed steels. Master Thesis; Technische Universiteit Delft 2008.
  2. Bigg TD. Quenching and partitioning a new steel heat treatment concept. Phd Thesis; University of Leeds 2011.
  3. Cooman BD, Speer JG. Quench and partitioning steel: a new AHSS concept for automotive anti-intrusion applications. Steel Research International 2006; 77: 634-640.
  4. Speer J, Matlock DK, De Cooman BS, Schroth JG. Carbon partitioning into austenite after martensite transformation. Acta Materialia 2003; 51: 2611-2622.
  5. Calderón D, Sabirov I, Molina-Aldareguia JM. Mechanical properties of advanced high-strength steels produced via quenching and partitioning. Phd Thesis; Universidad Carlos III de Madrid 2015.
  6. Shirali A., Honarbakhsh Raof A, Bazaz Banaie S, Hasani MA, Karam Abian M. Effect of Partitioning Time and Temperature during Q&P Process on Mechanical Properties of 1.5142 Steel. Journal of Advanced Materials and Technologies 1393; 3: 1-8 (In Persian).
  7. Vardhan AK, Shubhanyu V, Kumar U, Abhishek D. Effect of quenching and partitioning process in carbon steels. International Journal of Current Engineering and Technology 2017; 7: 831-834.
  8. Speer JG, Rizzo FC, Matlock DK, Edmonds D. The quenching and partitioning process: background and recent progress. Materials Research 2005; 8: 417-423.
  9. Jatczak CF. Retained austenite and its measurement by X-ray diffraction. SAE Transactions 1980; 89: 1657-1676.
  10. Bohemen SMC. Bainite and martensite start temperature calculated with exponential carbon dependence. Materials Science and Technology 2012; 28: 487-495.
  11. Clarke AJ, Speer JG, Matlock DK, Rizzo FC, Edmonds DV, Santofimia MJ. Influence of carbon partitioning kinetics on final austenite fraction during quenching and partitioning. Scripta Materialia 2009; 61: 149-152.
  12. Santofimia MJ, Petrov RH, Zhao L, Sietsma J. Microstructural analysis of martensite constituents in quenching and partitioning steels. Materials Characterization 2014; 92: 91-95.
  13. Speer JG, Edmonds DV, Rizzo FC, Matlock DK. Partitioning of carbon from supersaturated plates of ferrite, with application to steel processing and fundamentals of the bainite transformation. Solid State and Materials Science 2004; 8: 219-237.
  14. Zhang J, Ding H, Wang C, Zhao J, Ding T. Work hardening behaviors of a low carbon Nb microalloyed Si-Mn quenching-partitioning steel with diffrent cooling styles aftr partitioning. Materials Science & Engineering 2013; 585: 132-138.
  15. Santofimia MJ, Zhao L, Petrov R, Kwakernaak C, Sloof WG, Sietsma J. Microstructural development during the quenching and partitioning process in a newly designed low-carbon steel. Acta Materialia 2011; 59: 6059-6068.
  16. Feng J, Frankenbach T, Wettlaufer M. Strengthening 42CrMo4 steel by isothermal transformation below martensite start temperature. Materials Science & Engineering A 2017; 683: 110-115.
  17. Dlouhý HJ, Nový Z. Influence of parameters of q-p process on properties and microstructure of CMnSiMo steel. 19th International Conference on Metallurgy and Materials Hotel Relax; Roznov pod Radhostem: Czech Republic 2010.
  18. Navarro-López A, Hidalgo J, Sietsma J, Santofimia MJ. Influence of the prior athermal martensite on the mechanical response of Influence of the prior athermal martensite on the mechanical response of advanced bainitic steel. Materials Science & Engineering A 2018; 735: 343-353.
  19. Feng J, Frankenbach T, Wettlaufer M. Strengthening 42CrMo4 steel by isothermal transformation below martensite start temperature. Materials Science & Engineering A 2017; 683: 110-115.

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