تبلیغات
metallurgy - طبقه بندی چدنها
جمعه 5 فروردین 1390  08:22 ق.ظ
نوع مطلب: (انواع چدنها ،) توسط: anarch kh

چدن ها به دو گروه اصلی طبقه‌بندی می‌شوند، آلیاژهایی برای مقاصد عمومی که موارد استعمال آنها در کاربردهای عمده مهندسی است و آلیاژهای با منظور و مقاصد ویژه از جمله چدنهای سفید و آلیاژی که برای مقاومت در برابر سایش، خوردگی و مقاوم در برابر حرارت بالا مورد استفاده قرار می‌گیرند.

چدن های معمولی (عمومی)

این چدن ها جزو بزرگترین گروه آلیاژهای ریختگی بوده و براساس شکل گرافیت به انواع زیر تقسیم می‌شوند:

چدن های خاکستری ورقه ای یا لایه ای

چدن های مالیبل یا چکش خوار

چدن های گرافیت کروی یا نشکن

چدن های گرافیت فشرده یا کرمی شکل

چدن های سفید و آلیاژی مخصوص

چدن های بدون گرافیت، شامل سه نوع زیر می باشد:

چدن سفید پرلیتی

چدن سفید مارتنزیتی (نیکل- سخت)

چدن سفید پرکرم

 این چدنها در سه طبقه زیر قرار می‌گیرند:

چدنهای مارتنزیتی با Cr 12%-28

چدنهای فریتی با 34-%30 Cr

چدنهای آستنیتی با 30-15%Cr و 15-10% Niبرای پایداری زمینه آستنیتی در دمای پایین.

چدن های گرافیت دار:

چدن های آستنیتی: شامل دو نوع (نیکل- مقاوم) و (نیکروسیلالNi-Si )

چدن های فریتی

شامل دو نوع زیر می‌باشد:

چدن سفید 5% سیلیسیم و نوع دیگر چدن پرسیلیسیم (15%)

چدن های سوزنی

 

 

انواع چدن ها

%P

%S

%Mn

%Si

%C

چدن خاکستری

4-2.5

3-1

1-0.25

0.25-0.02

1-0.5

چدن سفید

2.6-1.8

1.9-0.5

0.8-0.25

0.2-0.06

0.18-0.06

چدن مالیبل

3.6-2

1.6-1.1

1-0.2

0.18-0.04

>0.03

چدن داکتیل

4-3

2.6-1.8

1-0.1

0.06-0.01

>0.01


  • آخرین ویرایش:چهارشنبه 10 فروردین 1390
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