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Article
Welding procedures of Turbine Blades by Using ER 309L Austenitic Filler Wire

Authors: H. A. Olaa --- K.H. Abbas --- S. A. Emad --- A.H. Fadhil
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2017 Volume: 35 Issue: 1 Part (A) Engineering Pages: 68-75
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

In the present work it has been investigated the repair of LP-blades steam turbine made of AISI 410 martensitic stainless steels (MSS) by GTAW welding, the repair welding carried out by using ER 309L as consumable filler wire. PWHT was carried out at 1100ᵒC for 1h. The structure-property relationships of the weldments were established based on the current modes employed by utilizing combined techniques of optical microscopy, line/point and EDS analysis. Results showed that Micro-hardness along the base and HAZ regions increased after PWHT as compared to in state of as-welded. After welding process, microstructure photographs of weld-metal region revealed two phase the vermicular δ-Ferrite and γ-austenite matrix. HAZ region consisted of tempered lath martensite with carbides. Line/Point analysis revealed the direction of segregation, whereas chromium was increased in core and depleted in boundary, while nickel was depleted in core and increased in boundary, this support the δ – ferrite was primarily solidified.


Article
Estimation the reliability function of multi state system by using Direct Partial Logic Derivative
تقدير الدالة المعولية للانظمة متعدد الحالات بأستخدام المشتقة الجزئية المنطقية المباشرة

Authors: انتصار عريبي فدعم --- اسيل مبدر داود
Journal: journal of Economics And Administrative Sciences مجلة العلوم الاقتصادية والإدارية ISSN: 2227 703X / 2518 5764 Year: 2014 Volume: 20 Issue: 77 Pages: 333-350
Publisher: Baghdad University جامعة بغداد

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Abstract

In this research is estimated the function of reliability dynamic of multi state systems and their compounds and for three types of systems (serial, parallel, 2-out-of-3) and about two states (Failure and repair) depending on calculating the structur function allow to describing the behavior of the reliability of the system depending on the efficiency of its components. And the researcher estimates the dynamic reliability indicators which in turn describes changes in the reliability of multi state system caused by changes in the efficiency of the components system. These indicators were estimated by Direct Partial Logic derivativeSampeles:-(MSS): Multi-state system(MSSRF) : Reliability function of Multi-state systemΦ(x): Structure function(SFOMSS): Structure function of Multi-state system(DRI): Dynamic Reliability Indices{Gf/Xi}:set of failure states for each compmnent{Gr/Xi}: set of repair states for each compmnent(CDRI): Dynamic reliability for each component(DIRI): Dynamic reliability for complete system

في هذا البحث يتم تقدير المعولية الديناميكية للنظام المتعدد الحالة ولكل مكون من مكوناته ولثلاثة انواع من الانظمة (المتسلسل، المتوازي ، 2-out-of-3) وكالتي (الفشل والاصلاح) بالاعتماد على حساب الدالة الهيكلية التي تسمح بوصف سلوك معولية النظام اعتمادا على كفاءة مكوناته . ويقوم الباحث بتقدير مؤشرات المعولية الديناميكية التي بدورها تصف التغيرات الحاصله في معولية النظام المتعدد الحالات التي تسببها التغيرات في كفاءة مكونات النظام . وتم تقدير هذه المؤشرات الديناميكيه بواسطة المشتقه الجزئيه المنطقيه المباشرةالرموز:- Mss :- النظام المتعدد الحالاتMSSRF :- الداله المعوليه للانظمه المتعددة الحالاتSFOMSS :- الداله الهيكليه للنظام المتعدد الحالاتDRI :- مؤشرات المعوليه الديناميكيه/ Xi } { Gf :- مجموعة حالات الفشل لكل مكون/ Xi } { Gf :- مجموعة حالات الاصلاح لكل مكونCDRI :- المعوليه الديناميكيه لكل مكون DIRI :- المعوليه الديناميكيه للنظام باكمله φ(x):- الداله الهيكليه

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