نتایج جستجو برای: austenitizing temperature

تعداد نتایج: 452966  

Journal: :Sakarya University Journal of Science 2019

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Journal: :Metallography, Microstructure, and Analysis 2022

Nb–Ti microalloyed low carbon high strength alloy (HSLA) steels are used to fabricate components, particularly for the automobile and piping applications requiring optimum combination of mechanical properties along with good weldability. These depend on transformed ferrite microstructure grain size obtained after cooling from hot rolling temperatures which always well above austenitizing temper...

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2013
Akinobu Shibata Shohei Daido Daisuke Terada Nobuhiro Tsuji

This study investigated the microstructures of pearlite and martensite transformed from ultrafine-grained austenite in 0.45C steel and Vadded 0.45C steel. The mean prior austenite grain sizes were refined to be 4.5 μm in the 0.45C specimen and 2.4 μm in the V-added 0.45C specimen through cyclic heat treatment of austenitizing and water quenching, i.e., repetition of martensite § austenite trans...

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پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه یزد - دانشکده جغرافیا 1392
صفورا رجبی مورکانی, کمال امیدوار, احمد مزیدی,

the west of esfahan province, iran, is one of the most important agricultural areas throughout the country due to the climate variability and life-giving water of zayanderood river. rice is one of the major and economic crops in this area. the most important climatic elements in agricultural activities which should be considered include temperature, relative humidity, precipitation and wind. so...

15 صفحه اول
پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شهید چمران اهواز - دانشکده مهندسی علوم آب 1393
شهین تبوزاده, حیدر زارعی, ام¬البنین بذرافشان,

drought is transient phenomenon , slow , repetitive and integral part of the climate of each region. drought begins with a substantial reduction in precipitation over the long-term average rainfall and over time, reduced soil moisture and surface and ground water resources will continue to decrease. this phenomenon is the most important in bakhtegan basin because of its importance in strategic ...

Journal: :Journal of the Japan Institute of Metals and Materials 1962

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Journal: :Journal of the Japan Institute of Metals and Materials 1961

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Journal: International Journal of Research in Materials Science 2015
Ali Akbar Ekrami, Hossein Yosbashizadeh, Mahmoud Hajisafari, Saied Nategh,

‌‌‌Fatigue behavior of a vanadium microalloy steel has been studied in this research. Here, microstructure constituents were considered which essentially are dependent on the heat treatment conditions. The results of high cycle fatigue tests revealed that heat treatment procedure and cooling rates have significant effects on fatigue properties. Optimal heat treatment cycle of the microalloyed s...

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Journal: International Journal of Iron and Steel Society of Iran 2013
A. Taherizadeh G. Dini, Z. Samadi Shahreza

AISI 4340 steel is one of the super strong steels that can be selected for different applications. By designing the proper cycles of heat treatment, the optimum microstructure and properties of this steel can be achieved. In this study, different heat treatment cycles were introduced to achieve the optimum microstructure and improve the mechanical and magnetic properties of AISI 4340 steel. The...

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Journal: :Journal of the Japan Institute of Metals and Materials 1972

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