دانلود تحقیق فولاد های میکرو آلیاژی

فهرست:

فصل اول مقدمه ................................................................................................. 1

فصل دوم :‌مروری بر منابع ............................................................................... 4

1-2- فولادهای کم آلیاژ و دارای استحکام بالا ............................................. 5

1-1-2- طبقه بندی فولادهای کم آلیاژ دارای استحکام بالا .............. 6

2-1-2- اثرات افزودنی های میکروآلیاژ کننده ................................... 8

3-1-2- انواع گوناگون فولادهای فریت – پرلیت میکروآلیاژ شده . 8

4-1-2- اثرات عناصر میکروآلیاژی روی مشخصه های به عمل آوری   18

5-1-2- به عمل آوری فولادهای پتک کاری میکروآلیاژ شده .......... 19

6-1-2- کنترل خصوصیات ..................................................................... 19

7-1-2-اثرات عناصر میکروآلیاژی شده روی پتک کاری ................. 20

2-2- مهندسی محصولات آهنگری فولادهای ساختمانی میکروآلیاژی ... 22

3-2- تبلور مجدد استاتیکی فولاد آستنیت تغییر شکل یافته و رسوب سینتیک القا شده در فولادهای میکروآلیاژی وانادیوم ........................................................................................ 35

1-3-2- تبلور مجدد استاتیکی ............................................................. 37

2-3-2- نمودارهای دما و زمان رسوب PTT ...................................... 48

3-3-2- مقایسه ی بین Tnr , SRCT  ................................................. 51

4-2- ریز ساختار و ویژگی های فولاد کم آلیاژ مقاوم به دما...................... 54

1-4-2- ترکیب شیمیایی ....................................................................... 58

2-4-2-پردازش و عمل آوری ترمو مکانیکی....................................... 59

3-4-2- ریز ساختار ............................................................................... 62

4-4-2- تنش تسلیم دمای فزاینده ..................................................... 63

5-4-2- سختی ضربه ای ....................................................................... 65

6-4-2- مقاومت به دما............................................................................ 66

5-2- فرآیند ترمو مکانیکی و ریز ساختار فولاد میکرو آلیاژی و محصولات میله ای سیمی         68

 1-5-2- میکروساختار و خواص آن ........................................................ 72

2-5-2- پیشرفت های بعدی ................................................................... 76

6-2- بهبود استحکام ضربه و خواص کششی در فولاد میکروآلیاژی آهنگری گرم وانادیوم – نیوبیوم از طریق کنترل میکروساختار .............................................................................. 77

1-6-2- خواص مکانیکی ............................................................................ 80

2-6-2- میکروساختار ............................................................................... 85

3-6-2- میکروساختار .............................................................................. 90

4-6-2- خواص مکانیکی ........................................................................... 93

فصل سوم:نتیجه گیری و پیشنهادات.............................................................. 95

نتیجه گیری ........................................................................................................ 96

پیشنهادات.......................................................................................................... 98

مراجع .................................................................................................................. 99

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