تأثیر فلز پرکننده بر خواص اتصال غیرمشابه فولاد 4130 به فولاد زنگ‌نزن 316 L

نویسندگان

1 1- مرکز تحقیقات مواد پیشرفته، دانشکده مهندسی مواد، واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران

2 1- مرکز تحقیقات مواد پیشرفته، دانشکده مهندسی مواد، واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران , 2- گروه مهندسی مواد و متالورژی، دانشکده فنی و مهندسی، دانشگاه اراک

چکیده

در این پژوهش، اتصال غیر‌مشابه فولاد کم آلیاژ 4130 به فولاد زنگ‌نزن آستنیتی ‌L316 به‌روش جوشکاری قوسی تنگستن- گاز مورد بررسی قرار گرفت. از دو فلز پرکننده ERNiCr-3 و فولاد زنگ‌نزن ER309L بـه ایـن منظـور اسـتفاده شـد. پـس از جوشـکاری، ریزساختار مناطق مختلف هر اتصال شامل فلز جوش، مناطق متأثر از حرارت و فصل مشترک‌ها با استفاده از میکروسکوپ نوری و میکروسکوپ الکترونی روبشی (SEM) مورد بررسی قرار گرفت. جهت بررسی خواص مکانیکی اتصال از آزمون‌های ضربه و کشش استفاده شد. مشاهدات انجام شده توسط SEM نشان داد که در آزمون ضربه، شکست نمونه‌ها به‌صورت نرم می‌باشد. در آزمون کشش نمونه جوش داده شده با سیم جوش ER309L از فولاد پایه L‌316 دچار شکست شد، اما نمونه جوش داده شده با سیم جوش ERNiCr-3 از محل جوش دچار شکست شد. بررسی‌ها نشان‌دهنده وجود سـاختار دندریتی در فلزات جوش پایه نیکلی بود. ریزساختار فلـز پرکننده فولاد ER309L به‌صورت سلولی- دندریتی بوده و به‌دلیل وجـود فاز فریـت دلتـا در نـواحی بـین دنـدریتی آستنیت زمینه، هیچ‌گونه ترکی در این اتصال مشاهده نشد.
 

کلیدواژه‌ها


عنوان مقاله [English]

The Effect of Filler Metal on Properties of AISI 4130 to AISI 316L Dissimilar Joint

نویسندگان [English]

  • M. Poorkabirian 1
  • H. Mostaan 2
  • M. Rafiei 1
1 1. Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran
2 1. Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran, 2. Department of Materials and Metallurgical Engineering, Faculty of Engineering, Arak University, Arak, Iran
چکیده [English]

In this research, dissimilar welding between 4130 low alloy steel and austenitic stainless steel 316L has been investigated using Gas Tungsten Arc Welding (GTAW). Two types of filler metals, including ERNiCr-3 and ER309L, were used for this purpose. Moreover, the joint microstructures including the weld metals, heat affected zones and interfaces were characterized by optical and Scanning Electron Microscopy (SEM). The mechanical behavior of the joint was tested by impact and tension tests. Observations by SEM showed that in impact test, the fracture is soft. In the tensile test, the welded sample by ER309L filler metal was fractured from 316L base metal, but welded specimen with ERNiCr-3 was fractured from welded zone. Also, the results showed a dendritic structure in the nickel-based weld metal. No crack was found in the cellular-dendritic microstructure of ER309L weld metal due to the existance of delta ferrite between them.
 

کلیدواژه‌ها [English]

  • Dissimilar joint
  • Gas Tungsten Arc Welding (GTAW)
  • 316 Austenitic Stainless Steel
  • 4130 Low Alloy Steel
  • Inconel 82
  • mechanical properties
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