بررسی تجربی و تحلیلی تاثیر شرایط عملیات حرارتی رسوب سختی بر ریزساختار، خواص مکانیکی و هدایت الکتریکی آلیاژ مس- 4/0 % کروم

نوع مقاله : علمی و پژوهشی

نویسندگان

1 گروه مکانیک، دانشکده مهندسی مکانیک، دانشگاه صنعتی جندی شاپور دزفول، دزفول، ایران.

2 مجتمع دانشگاهی مواد و فناوریهای ساخت، دانشگاه صنعتی مالک اشتر، تهران، ایران.

چکیده

در این مقاله تاثیر دمای پیرسختی بر ریزساختار، خواص مکانیکی و الکتریکی آلیاژ مس- 4/0 % کروم مورد بررسی قرار گرفته است. فرآیند محلول‌سازی در دمای 950 درجه سانتیگراد به مدت یک ساعت و پیرسازی در دماهای مختلف 200، 300، 400، 500 و 600 درجه سانتی‌گراد به مدت 5 انجام گرفت. ریزساختار نمونهها توسط میکروسکوپ الکترونی گسیل میدانی بررسی گردید. علاوه بر این، یک مدل تحلیلی جهت تعیین میزان رسوب عناصر آلیاژی و استحکام تسلیم نمونه‌ها بکمک آنالیز کمی تصاویر ریزساختار و هدایت الکترکی آنها ارایه شده است. با افزایش دمای رسوب سختی تا 500 درجه سانتی‌گراد تعداد رسوبات افزایش و اندازه آنها کاهش می‌یابد. استحکام تسلیم، استحکام کششی و توان کارسختی در دماهای 200 و 300 درجه سانتی گراد نسبت به نمونه محلول‌سازی شده کاهش، در دمای 400 و 500 درجه سانتی‌گراد افزایش و مجددا در دماهای بالاتر کاهش می‌یابند. استحکام کششی و استحکام تسلیم در شرایط بهینه رسوب سختی نسبت به نمونه محلولسازی شده به ترتیب 7/21 و 7/51 % افزایش داشته‌اند. با افزایش دمای رسوب سختی تا دمای 500 درجه سانتیگراد هدایت الکتریکی بطور پیوسته افزایش یافته و در دمای بالاتر از 500 درجه تقریبا ثابت می‌ماند. همچنین مقایسه نتایج تست کشش با نتایج مدل نشان داد که مدل ارایه شده در این مقاله با دقت خوبی قادر به پیش‌بینی تنش تسلیم نمونه‌های پیر سخت شده است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Effects of precipitation hardening heat treatment conditions on the microstructure, mechanical properties, and electrical conductivity of Cu - 0.4%Cr alloy

نویسندگان [English]

  • Vahid Norouzifard 1
  • amir talebi 2
1 Department of mechanical engineering, Jundi-shapur University of technology, Dezful, Iran.
2 Faculty of Materials & Manufacturing Technologies, Malek Ashtar University of Technology, Tehran, Iran
چکیده [English]

In this paper, the effects of the aging temperature on the microstructure, mechanical properties, and electrical conductivity of Cu-0.4% Cr are investigated. The solid solution treatment was performed at 950 ᵒC for 1 hour. Then the samples were aged 5 hours at 200, 300, 400, 500, and 600 ᵒC. The microstructure of the samples was surveyed using FESEM. An analytical model is also developed to predict the age-hardened samples yield stress and the precipitation of the alloying elements based on the microstructure images analysis and electrical conductivity of the samples. Increasing the aging temperature up to 500 ᵒC, the number of precipitates increases and their size decreases. Yield strength, tensile strength, and work hardening exponent at aging temperatures of 200 and 300 ᵒC decreases a little and increases at 400 and 500 ᵒC and then decreases at higher temperatures. In optimum precipitation hardening conditions, the yield strength and tensile strength are higher 51.7 and 21.7% than solid solution treatment, respectively. Electrical conductivity increases by the aging temperature increasing up to 500 ᵒC and then remains almost constant at higher temperatures. Comparison between the tensile test and the present model results shows that the model is capable to predict the yield strength of the age hardened samples by good accuracy.

کلیدواژه‌ها [English]

  • Precipitation hardening
  • Microstructure
  • Mechanical properties
  • Analytical model
  • Electrical Conductivity

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