Mahmoud Abdelrahman Abdelsalam <br/><br/>
Influence of heat input and post - weld heat treatment on microstructure and mechanical properties of power boiler steel P91 (9Cr-1Mo-V- Nb) weld joints /  
   ( فانديم  - نيوبيم -9كروم - 1مولبدنم)  P91 تأثير مدخلات الحرارة والمعالجة الحرارية التالية للحام على البنية المجهرية والخواص الميكانيكية لصلب غلايات محطات الطاقة  بعد اللحام 
Mahmoud Abdelrahman Abdelsalam ; Supervised Mohamed Raafat Mahmoud Elkoussy , Iman Salah Eldeen Elmahalawi 
 - Cairo :   Mahmoud Abdelrahman Abdelsalam ,   2013 
 - 148P. :   charts , facsimiles ;   30cm 
<br/><br/>Thesis (Ph.D.) - Cairo University - Faculty of Engineering - Department of Metallurgical Engineering 
<br/><br/> Modified 9Cr - 1Mo steel pipes were welded using three different levels of heat inputs 1.1, 2.28 and 3.16 K.J/ mm, respectively . Normalizing treatment at 1050  C followed by tempering at 760 C, and tempering only were employed . The best combination of mechanical and corrosion properties with a significant increase of about 90% in time to rupture were obtained with heat inputs between 1.1 and 2.28 kJ/mm when employed with normalizing treatment compared to normal tempering treatment 
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<br/><br/><label>Subjects--Index Terms: </label>Heat input  Heat treatment  Modified boiler steel 9Cr-1Mo