بوردهی سوپرآلیاژ In-738 به‌روش جعبه سمانتاسیون و بررسی سینتیک تشکیل لایه بورای

نویسندگان

1 1. دانشکده فنی و مهندسی، گروه مهندسی مواد، دانشگاه بوعلی سینا همدان

2 2. پژوهشگاه نیرو، گروه پژوهشی مواد غیرفلزی

چکیده

در این مطالعه، مکانیزم تشکیل پوشش بورایدی و سینتیک تشکیل آن روی سوپر آلیاژIn–738  به‌روش نفوذی جعبه سمانتاسیون مورد بررسی قرار گرفت. فرایند بوردهی در دمای 900 درجه سانتی­گراد و در زمان‌های مختلف کوتاه (5، 15، 45 و 60 دقیقه) انجام شد. فاز‌شناسی سطح نمونه ­ها به‌کمک الگوی پراش پرتو ایکس (XRD) پس از بوردهی نشان داد علاوه بر فاز Ni3B ابتدا بورایدهایی مانند Cr5B3، AlB2 و W2B و سپس در زمان­های بیشتر بوردهی ترکیبات مانند MoB2، VB، TiB، Ni6Si2B وMo2NiB2  تشکیل شدند. با بررسی تصاویر میکروسکوپی الکترونی روبشی (SEM) مشخص شد که با افزایش زمان بوردهی علاوه بر افزایش ضخامت پوشش بورایدی، منطقه تحتانی پوشش تحت نفوذ (IDZ) و مهاجرت عناصر آلیاژی رشد کرد. بررسی سینتیک فرایند بوردهی با اصول تئوری نفوذ در انطباق بود و تأیید کرد که مکانیزم نفوذ در منطقه تحتانی پوشش تحت نفوذ در دو بازه زمانی تغییر می­کند. ضخامت پوشش بورایدی و سختی سطح نمونه بوردهی شده پس از 60 دقیقه به‌ترتیب برابر 8/27 میکرومتر و 853 ویکرز بود.

کلیدواژه‌ها

عنوان مقاله [English]

Boriding of In-738 Superalloy via the Pack Cementation Method and the Study of the Kinetic of Boride Layer Formation

نویسندگان [English]

  • H. Esfahani 1
  • M. Rasouli Samar 1
  • F. Dabir 2
  • A. Abdollahzadeh 1
1 1. Department of Materials Engineering, Bu-Ali Sina University, Hamedan, Iran.
2 2. Non Metallic Materials Research Department, Niroo Research Institute (NRI), Tehran, Iran.
چکیده [English]

In this study, mechanism and kinetic of formation of boride layer on In-738 superalloy were investigated via diffusion pack cementation method. Boriding was carried out at 900 °C for several short times (5, 15, 45 and 60 min). Phase study by means of X Ray defragtion (XRD) indicated that in addition to Ni3B, other phases such as Cr5B3, AlB2, and W2B were formed at the first period of process, and other compounds such as MoB2, VB, TiB, Ni6Si2B, and Mo2NiB2 were generated in the more prolonged time. SEM study also showed that not only the thickness of boride coating was increased, but also an interdiffusion zone (IDZ) was formed under the coating and it was grown by the upward diffusion of alloy elements. The kinetic study was good according to diffusion theory, confirming the two diffusion steps for IDZ. Thickness and hardness of the boride coating over 60 min process were 27.8 µm and 853 HV, respectively.

کلیدواژه‌ها [English]

  • Boriding
  • diffusion
  • Hardness
  • Kinetic
  • Superalloy

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مواد پیشرفته در مهندسی
دوره 38، شماره 1
خرداد 1398
صفحه 76-86

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