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ارزیابی خواص اتصال غیر مشابه فولاد زنگ نزن سوپر دوفازی UNS S32750 به فولاد کم آلیاژ استحکام بالای API X65 | ||
| نشریه مهندسی مکانیک امیرکبیر | ||
| مقاله 5، دوره 46، شماره 2، اسفند 1393، صفحه 45-55 اصل مقاله (1.44 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/mej.2015.349 | ||
| نویسندگان | ||
| مجید صادقیان1؛ مرتضی شمعانیان* 2؛ علی شفیعی3 | ||
| 1کارشناسی ارشد، دانشکده مهندسی مواد، دانشگاه صنعتی اصفهان | ||
| 2استاد، دانشکده مهندسی مواد، دانشگاه صنعتی اصفهان | ||
| 3دانشیار، دانشکده مهندسی مواد، دانشگاه صنعتی اصفهان | ||
| چکیده | ||
| خواص عالی فولادهای زنگنزن سوپر دوفازی مدیون بالانس ریزساختار دوگانه فریتی - آستنیتی آنهاست در حالیکه در طی جوشکاری این فولادها ، نسبت مطلوب آستنیت – فریت از بین می‌رود و فازهای مضری نیز تشکیل می‌شود. در این پژوهش فولاد زنگ نزن سوپر دوفازی UNS 32750 به فولاد کم آلیاژ استحکام بالای API X65 به روش جوشکاری قوسی تنگستن - گاز اتصال داده شد و به منظور ارزیابی خواص فلز جوش، از آزمون‌های استحکام ضربهای، پلاریزاسیون پتانسیودینامیک و سیکلی استفاده شد. همچنین رفتار خوردگی گالوانیکی بین زوج گالوانیکی فلز جوش و فولاد کم آلیاژ استحکام بالا به کمک تکنیک ZRA تعیین شد. نتایج نشان داد که میزان آستنیت فلز جوش بیشتر از فلز پایه و فاز مضری در آن به وجود نیامده است. استحکام ضربهای فلز جوش بیشتر از فلزات پایه است، همچنین رفتار خوردگی فلز جوش شبیه به فلز پایه زنگ نزن سوپر دوفازی و بسیار بهتر از فولاد کم آلیاژ استحکام بالا بود. نتایج آزمون ZRA نیز نشان داد که در زوج گالوانیکی فلز جوش - فولاد کم آلیاژ استحکام بالا، فولاد کم آلیاژ استحکام بالا دچار خوردگی می‌شود و مکانیزم آن از نوع خوردگی حفره‌ای است. | ||
| کلیدواژه‌ها | ||
| فولاد زنگ نزن سوپر دوفازی؛ فولاد کم آلیاژ استحکام بالا؛ جوشکاری؛ استحکام ضربهای؛ رفتار خوردگی | ||
| عنوان مقاله [English] | ||
| Evaluation of dissimilar joint properties between UNS S32750 and API X65 | ||
| نویسندگان [English] | ||
| Majid Sadeghian1؛ Morteza Shamanian2؛ ALI SHAFYEI3 | ||
| چکیده [English] | ||
| The excellent properties of super duplex stainless steels (SDSS) are mainly due to their balance of ferrite - austenite since this balance is highly likely to change during welding and undesirable phases can create. In this work gas tungsten arc welding (GTAW) process was used to join UNS S32750 SDSS to API X65 high strength low alloy (HSLA) steel. The properties of weldments were investigated by impact test, potentiodunamic and cyclic polarization tests. Zero resistance ammeter (ZRA) tests also were used for investigation of behavior of galvanic corrosion on weld metal – HSLA base metal. Results indicated that amount of austenite in weld metal was higher than SDSS base metal and did not created undesirable phases. Toughness of weldment was higher than base metals and corrosion behavior of weld metal was alike SDSS base metal and presented excellent corrosion resistance comparing HSLA base metal. The results of ZRA showed that HSLA eroded in galvanic couple weld metal – HSLA and mechanism of corrosion was pitting corrosion. | ||
| کلیدواژه‌ها [English] | ||
| Super duplex stainless steel, high strength low alloy steel, Welding, Toughness, corrosion behavior | ||
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| مراجع | ||
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