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Register a new userThe Influence of Low Cast Steel of Gangue on the Characteristics
تأثير الشوائب في خواص الفولاذ منخفض السبائكية
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فؤاد ضحية( باحث )
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یهدف الموضوع إلى دراسة تأثير الشوائب و البحث في الطرائق النظریة و التجریبية للحد من تشكل هذه الشوائب في أثناء تصنيع الفولاذ . لقد قسمت الشوائب إلى الأكاسيد و الكبریتات و الشوائب المركبة من كلا النوعين .من المعروف التأثير السيئ لهذه الشوائب في الخواص الميكانيكية الفولاذ . لقد أثبتت التجارب أن لشوائب الكبریت تأثيراً أسوأ من الأكاسيد ، و خاصة كبریت الحدید FeS ، إذْ إنَّ درجة حرارة انصهاره 880ºC ، لذلك عند القيام بتشكيل الفولاذ على الساخن و الذي یتم عادة عند درجة الحرارة 1200ºC تتشكل من هذه الشوائب أقنية شعریة ضمن الفولاذ الذي تم تشكيله ، و من ثَمَّ تكون كتشققات مكرویة داخلية و نقاط ترآيز للإجهادات تسبب انهيار المعدن و تحطمه عند تعرضه لإجهادات أقل من حد الانسياب و التي تعدُّ ضمن قيم الإجهادات المسموح بها.
This paper aims at studying the influence of gangue aiid researching in the theoretical empirical methods in order to limit the formation of such gangue during the manufacture of steel. Gangues are divided to acids, sulfate and compound gangue. Such gangues are known for their bad influence on the mechanical characteristics of steel. Experiments have proved that the influence of Sulfur gangue especially FeS is worse than that of acids, as the melting point is 880t. Such gangue form capillary ducts within steel, thus there will be internal micro cleaves and stress points that will lead to collapse and break when the metal is exposed to stress less than the flowing point which is considered within the allowed stress values.
References used
BAKER ,T.J. – CHARLES , J.A. : Effect of second phase particles On mechanical properties of steel , ISI London 1971
BAKER , T.J. – CHARLES , J. A. :Iron steel Inst. 1973
MYSLIVEC , T. : Fyzikalne- chemicke zaklady ocelarstvi SNTL Praha 1971
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