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Microstructure and Durability Analysis of Multi-Layer Repaired Forging Dies

Thesis Info

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Author

Muhammad Amin

Program

PhD

Institute

University of Engineering and Technology

City

Lahore

Province

Punjab

Country

Pakistan

Thesis Completing Year

2009

Thesis Completion Status

Completed

Subject

Applied Sciences

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/2176/1/2743S.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676726644940

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Multilayer Flood-welding repair of hot forging dies is a very useful technique which can remarkably enhance the working life of the die. Conventional quenched and tempered dies do not exhibit good resistance to wear. Therefore, these dies are nitrided to improve wear resistance but after the production of few numbers of forgings cracks are produced. That’s why here multilayer flood-welding technique has been adapted to improve the die life and to establish the optimum parameters for this technique. In the current work, the modified H12 hot-work tool steel was weld deposited in the cavity of hot-forging dies and their performance was monitored visually for the die condition and with the macroscopic and microscopic examination. It was analyzed that the thicknesses of the both hard upper ‘capping layer’ and intermediate ‘buffer layer’ have a prominent influence on the performance and the life hot forging die. For a particular dimensions and contour of the die impression, there came out an optimal thickness of the capping layer that provided the best performance. Further increase in capping layers thickness exhibited brittle cracking, whereas thinner capping layers produced early wear and plastic deformation. For intermediate buffer layer, in order to provide adequate backup support to capping layer, a certain minimum thickness level is required. This process minimized the die steel consumption because the thickness of the forging die is not reduced in the process of reworking and ultimately the process is cost effective. Moreover, the Multilayered flood-welded dies were gas nitrided to further enhance the life of the forging die. The results have shown that double stage nitriding process is good for these dies which produced minimum compound layer on the nitrided surface. The die life as a result of nitriding was amazingly increased compared to normal Multilayered flood- welded dies. The dies showed very slow wear and thermal fatigue cracking after the production of large number of forgings. By employing these dies excellent overall surface finish of the forged parts was achieved.
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شاعر صدیقی کی متفرق شاعری

شاعرؔ صدیقی کی متفرق شاعری
حمد
یہ شعری ادب کی وہ صنفِ سخن ہے جس میں اللہ تعالیٰ کی تعریف بیان کی جائے ۔عطاء الرحمٰن نوری اپنی کتاب ’’اْردو اصناف ادب‘‘ میں حمد کی تعریف کرتے ہوئییوں لکھتیہیں:
’’حمد ایک عربی لفظ ہے جس کے معنی ’’تعریف‘‘ کے ہے۔اللہ کی تعریف میں کہی جانے والی نظم کو’’حمد‘‘کہتے ہیں‘‘(۱)
اردو کی دیگر اصنافِ سخن میں حمد کو بہت اہمیت حاصل ہے۔ حمد کا تعلق چوں کہ براہِ راست اللہ تعالیٰ کی ذاتِ گرامی سے ہے اس لیے اردو زبان کے شعرا نے حمد کو بڑی اہمیت دی ہے۔ اردو کے دیگر شعرا کی طرح شاعرؔ صدیقی نے بھی حمدیہ شاعری کی ہے۔ اُن کی حمدیہ شاعری اْن کی مذہبی عقیدت مندی اورجذبات کی عکاسی کرتی ہے۔اگر چہ اْن کا حمدیہ کلام اتنا زیادہ نہیں ہے تاہم جوبھی ہے وہ معیار کے لحاظ اپنی مثال آپ ہے۔شاعرؔنے خالق حقیقی کی ثنا وتوصیف بیان کرنے میں ہنر مندی کے ساتھ ساتھ اپنے عجز اور انکساری کا مظاہر ہ بھی کیا ہے۔شاعرؔکے حمدیہ اشعار خالق کائنات پرکامل یقین واعتماد کے مظہر ہیں۔ اْنہوں نے بڑی عقیدت مندی کیساتھ اپنے رب کی تعریف وتوصیف بیان کی ہے۔اللہ سے بے پناہ محبت وعقیدت کی یہ جھلک محض نظموں تک محدود نہیں بلکہ دیگر اصنافِ سخن یعنی قطعہ ،باعی،اور دوہے میں بھی پوری شان کے ساتھ نمایاںہے۔حمد لکھنے کے لیے جو علمیت اور مطالعہ اسلام درکا ہوتا ہے شاعرؔصدیقی اس سے خوب بہرور ہے۔
مناجات
کلیات کے آغازمیں مناجات شامل ہیں جس میں شاعرؔنے اللہ سے دل کی وسعت اور فکر کی گہرائی مانگنے کے ساتھ ایسی بینائی مانگنے کی دْعا کی ہے جو اللہ کے جلوؤں کو دیکھنے کی صلاحیت رکھتی ہو:
دل میں وسعت دے میرے فکرکو گہرائی دے
ساتھ جو دے تیرے جلووں کا وہ بینائی دے
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