fa نیتروژن­دهی فولاد در محیط پلاسما و بررسی لایه سخت شده پژوهشي Research <p align="right"><span lang="AR-SA" dir="rtl" style="FONT-SIZE: 12pt COLOR: black FONT-FAMILY: Nazanin mso-fareast-font-family: 'Times New Roman' mso-ansi-language: EN-US mso-fareast-language: EN-US mso-bidi-language: AR-SA mso-ascii-font-family: 'Times New Roman' mso-hansi-font-family: 'Times New Roman'">در این طرح پس از ساخت سیستم مناسب برای ایجاد پلاسما در رژیم تخلیه تابان و تهیه نمونه­ها و انجام تحلیل­های سختی سنجی و </span><span style="FONT-SIZE: 12pt COLOR: black FONT-FAMILY: "Times New Roman" mso-fareast-font-family: 'Times New Roman' mso-bidi-font-family: Nazanin mso-ansi-language: EN-US mso-fareast-language: EN-US mso-bidi-language: AR-SA">PIXE</span><span dir="rtl"></span><span lang="AR-SA" dir="rtl" style="FONT-SIZE: 12pt COLOR: black FONT-FAMILY: Nazanin mso-fareast-font-family: 'Times New Roman' mso-ansi-language: EN-US mso-fareast-language: EN-US mso-bidi-language: AR-SA mso-ascii-font-family: 'Times New Roman' mso-hansi-font-family: 'Times New Roman'"><span dir="rtl"></span>، طی مراحل مختلف، فرآیند نیتروژن­دهی در شرایط متفاوت انجام شد. پس از پایان نیتروژن­دهی نمونه­ها، تحلیل­های سختی سنجی و </span><span style="FONT-SIZE: 11pt COLOR: black FONT-FAMILY: "Times New Roman" mso-fareast-font-family: 'Times New Roman' mso-bidi-font-family: Nazanin mso-ansi-language: EN-US mso-fareast-language: EN-US mso-bidi-language: AR-SA">PIXE</span><span dir="rtl"></span><span dir="rtl" style="FONT-SIZE: 11pt COLOR: black FONT-FAMILY: Nazanin mso-fareast-font-family: 'Times New Roman' mso-ansi-language: EN-US mso-fareast-language: EN-US mso-bidi-language: AR-SA mso-ascii-font-family: 'Times New Roman' mso-hansi-font-family: 'Times New Roman'"><span dir="rtl"></span> </span><span lang="AR-SA" dir="rtl" style="FONT-SIZE: 12pt COLOR: black FONT-FAMILY: Nazanin mso-fareast-font-family: 'Times New Roman' mso-ansi-language: EN-US mso-fareast-language: EN-US mso-bidi-language: AR-SA mso-ascii-font-family: 'Times New Roman' mso-hansi-font-family: 'Times New Roman'">به همراه تحلیل­های </span><span style="FONT-SIZE: 12pt COLOR: black FONT-FAMILY: "Times New Roman" mso-fareast-font-family: 'Times New Roman' mso-bidi-font-family: Nazanin mso-ansi-language: EN-US mso-fareast-language: EN-US mso-bidi-language: AR-SA">XRD,SEM,GDS</span><span dir="rtl"></span><span lang="AR-SA" dir="rtl" style="FONT-SIZE: 12pt COLOR: black FONT-FAMILY: Nazanin mso-fareast-font-family: 'Times New Roman' mso-ansi-language: EN-US mso-fareast-language: EN-US mso-bidi-language: AR-SA mso-ascii-font-family: 'Times New Roman' mso-hansi-font-family: 'Times New Roman'"><span dir="rtl"></span> و </span><span style="FONT-SIZE: 11pt COLOR: black FONT-FAMILY: "Times New Roman" mso-fareast-font-family: 'Times New Roman' mso-bidi-font-family: Nazanin mso-ansi-language: EN-US mso-fareast-language: EN-US mso-bidi-language: AR-SA">RBS</span><span dir="rtl"></span><span dir="rtl" style="FONT-SIZE: 11pt COLOR: black FONT-FAMILY: Nazanin mso-fareast-font-family: 'Times New Roman' mso-ansi-language: EN-US mso-fareast-language: EN-US mso-bidi-language: AR-SA mso-ascii-font-family: 'Times New Roman' mso-hansi-font-family: 'Times New Roman'"><span dir="rtl"></span> </span><span lang="AR-SA" dir="rtl" style="FONT-SIZE: 12pt COLOR: black FONT-FAMILY: Nazanin mso-fareast-font-family: 'Times New Roman' mso-ansi-language: EN-US mso-fareast-language: EN-US mso-bidi-language: AR-SA mso-ascii-font-family: 'Times New Roman' mso-hansi-font-family: 'Times New Roman'">بر روی قطعات انجام شد. نتایج به دست آمده در مورد فولادهای 304.316و 321 به وضوح افزایش سختی حداکثر 450 درصد را در بازده مورد مطالعه، نشان می­دهد. البته سایر تحلیل­های انجام گرفته بروز تغییرات محسوس در ساختار لایه سطحی نمونه­ها را تا عمق حداکثر 17000 آنگستروم، نشان می­دهد. نمودارهای ارایه شده با توجه به نتایج به دست آمده از تحلیل­های بالا رسم </span><font size="3"><font face="Nazanin"><span lang="FA" dir="rtl" style="FONT-SIZE: 12pt COLOR: black FONT-FAMILY: Nazanin mso-fareast-font-family: 'Times New Roman' mso-ansi-language: EN-US mso-fareast-language: EN-US mso-bidi-language: FA mso-ascii-font-family: 'Times New Roman' mso-hansi-font-family: 'Times New Roman'"><span style="mso-spacerun: yes">   </span></span><span lang="AR-SA" dir="rtl" style="FONT-SIZE: 12pt COLOR: black FONT-FAMILY: Nazanin mso-fareast-font-family: 'Times New Roman' mso-ansi-language: EN-US mso-fareast-language: EN-US mso-bidi-language: AR-SA mso-ascii-font-family: 'Times New Roman' mso-hansi-font-family: 'Times New Roman'">شده­اند. نتایج تحلیل</span></font></font><span style="FONT-SIZE: 11pt COLOR: black FONT-FAMILY: "Times New Roman" mso-fareast-font-family: 'Times New Roman' mso-bidi-font-family: Nazanin mso-ansi-language: EN-US mso-fareast-language: EN-US mso-bidi-language: AR-SA">XRD </span><span dir="rtl"></span><span dir="rtl" style="FONT-SIZE: 11pt COLOR: black FONT-FAMILY: Nazanin mso-fareast-font-family: 'Times New Roman' mso-ansi-language: EN-US mso-fareast-language: EN-US mso-bidi-language: AR-SA mso-ascii-font-family: 'Times New Roman' mso-hansi-font-family: 'Times New Roman'"><span dir="rtl"></span><span style="mso-spacerun: yes"><font face="Nazanin" size="3"> </font></span></span><span lang="AR-SA" dir="rtl" style="FONT-SIZE: 12pt COLOR: black FONT-FAMILY: Nazanin mso-fareast-font-family: 'Times New Roman' mso-ansi-language: EN-US mso-fareast-language: EN-US mso-bidi-language: AR-SA mso-ascii-font-family: 'Times New Roman' mso-hansi-font-family: 'Times New Roman'">تبدیل فازهای </span><span lang="EL" style="FONT-SIZE: 12pt COLOR: black FONT-FAMILY: "Times New Roman" mso-fareast-font-family: 'Times New Roman' mso-bidi-font-family: Nazanin mso-ansi-language: EL mso-fareast-language: EN-US mso-bidi-language: AR-SA">α</span><span dir="rtl"></span><span lang="AR-SA" dir="rtl" style="FONT-SIZE: 12pt COLOR: black FONT-FAMILY: Nazanin mso-fareast-font-family: 'Times New Roman' mso-ansi-language: EN-US mso-fareast-language: EN-US mso-bidi-language: AR-SA mso-ascii-font-family: 'Times New Roman' mso-hansi-font-family: 'Times New Roman'"><span dir="rtl"></span> و </span><span lang="EL" style="FONT-SIZE: 12pt COLOR: black FONT-FAMILY: "Times New Roman" mso-fareast-font-family: 'Times New Roman' mso-bidi-font-family: Nazanin mso-ansi-language: EL mso-fareast-language: EN-US mso-bidi-language: AR-SA">γ</span><span dir="rtl"></span><span lang="AR-SA" dir="rtl" style="FONT-SIZE: 12pt COLOR: black FONT-FAMILY: Nazanin mso-fareast-font-family: 'Times New Roman' mso-ansi-language: EN-US mso-fareast-language: EN-US mso-bidi-language: AR-SA mso-ascii-font-family: 'Times New Roman' mso-hansi-font-family: 'Times New Roman'"><span dir="rtl"></span> را به فاز </span><span dir="ltr"></span><span lang="AR-SA" style="FONT-SIZE: 12pt COLOR: black FONT-FAMILY: "Times New Roman" mso-fareast-font-family: 'Times New Roman' mso-bidi-font-family: Nazanin mso-ansi-language: EN-US mso-fareast-language: EN-US mso-bidi-language: AR-SA"><span dir="ltr"></span><span style="mso-spacerun: yes"><font face="Times New Roman" size="3"> </font></span></span><span lang="EL" style="FONT-SIZE: 12pt COLOR: black FONT-FAMILY: "Times New Roman" mso-fareast-font-family: 'Times New Roman' mso-bidi-font-family: Nazanin mso-ansi-language: EL mso-fareast-language: EN-US mso-bidi-language: AR-SA">γ</span>_{<span style="FONT-SIZE: 12pt COLOR: black FONT-FAMILY: "Times New Roman" mso-fareast-font-family: 'Times New Roman' mso-bidi-font-family: Nazanin mso-ansi-language: EN-US mso-fareast-language: EN-US mso-bidi-language: AR-SA">N</span>}<span dir="rtl"></span><span lang="AR-SA" dir="rtl" style="FONT-SIZE: 12pt COLOR: black FONT-FAMILY: Nazanin mso-fareast-font-family: 'Times New Roman' mso-ansi-language: EN-US mso-fareast-language: EN-US mso-bidi-language: AR-SA mso-ascii-font-family: 'Times New Roman' mso-hansi-font-family: 'Times New Roman'"><span dir="rtl"></span>، در نمونه­های پرتو دیده نشان می­دهد. همین­طور تحلیل </span><span style="FONT-SIZE: 11pt COLOR: black FONT-FAMILY: "Times New Roman" mso-fareast-font-family: 'Times New Roman' mso-bidi-font-family: Nazanin mso-ansi-language: EN-US mso-fareast-language: EN-US mso-bidi-language: AR-SA">PIXE</span><span dir="rtl"></span><span dir="rtl" style="FONT-SIZE: 11pt COLOR: black FONT-FAMILY: Nazanin mso-fareast-font-family: 'Times New Roman' mso-ansi-language: EN-US mso-fareast-language: EN-US mso-bidi-language: AR-SA mso-ascii-font-family: 'Times New Roman' mso-hansi-font-family: 'Times New Roman'"><span dir="rtl"></span> </span><span lang="AR-SA" dir="rtl" style="FONT-SIZE: 12pt COLOR: black FONT-FAMILY: Nazanin mso-fareast-font-family: 'Times New Roman' mso-ansi-language: EN-US mso-fareast-language: EN-US mso-bidi-language: AR-SA mso-ascii-font-family: 'Times New Roman' mso-hansi-font-family: 'Times New Roman'">کاهش غلظت آهن در لایه سطحی و جایگزینی نیتروژن را نشان می­دهد البته این فرآیند در مورد فولاد 316 که برخلاف دو فولاد دیگر دارای عنصر </span><span style="FONT-SIZE: 12pt COLOR: black FONT-FAMILY: "Times New Roman" mso-fareast-font-family: 'Times New Roman' mso-bidi-font-family: Nazanin mso-ansi-language: EN-US mso-fareast-language: EN-US mso-bidi-language: AR-SA">Mo</span><span dir="rtl"></span><span lang="AR-SA" dir="rtl" style="FONT-SIZE: 12pt COLOR: black FONT-FAMILY: Nazanin mso-fareast-font-family: 'Times New Roman' mso-ansi-language: EN-US mso-fareast-language: EN-US mso-bidi-language: AR-SA mso-ascii-font-family: 'Times New Roman' mso-hansi-font-family: 'Times New Roman'"><span dir="rtl"></span> است، کندتر رخ می­دهد.</span> <strong> </strong></p> <p><font face="times new roman,times,serif"><font size="2"><strong>  </strong>In this process after making proper chamber to produce plasma in d.c. Glow regime and readiness of samples and doing microhardness and PIXE analyzes, samples nitriding began in different conditions. The hardness changes and the depth of hardened layer of 321, 316 and 304 steels are studied as a function of discharge parameters [8, 9]. The plasma was produced using a mixture of N₂ and H₂ gases at glow discharge regime. The gas composition varied between 0.25< [n (H₂)]/ [n (N₂)] < 0.5, the sample temperature 300°C<t<400°c, /></font></font></p><p><em>  <strong></strong></em></p> سختکاری فولاد، نیتروژن دهی، پلاسما، تخلیه تابان Steels Hardening, Plasma Nitriding, 119 127 http://ijiepm.iust.ac.ir/browse.php?a_code=A-10-1-26&slc_lang=fa&sid=1 M. Moradshahi, mmoradshahi@aeoi.org.ir 18003194753284600658 18003194753284600658 Yes D.I Iraji 18003194753284600659 18003194753284600659 No