Abstract
Joint bar (fishplate) is an asymmetrical cross-section product with different mass elements – the web, the upper and lower bulbous heads. Technical standards specify the strict requirements on the joint bar mechanical properties and straightness. The microstructure after rolling (without heat treatment), after thermostrengthening according to the traditional technology – oil quenching, and accelerated water cooling technology has been studied by using optical and scanning electron microscope. The accelerated water cooling technology was the first implemented in industry for asymmetrical cross-section body. As a result, it was found that a high degree dispersion of the phases and the small grain size provided the best results in stable mechanical properties, which is typical for the sprayer system. The joint bar straightness is achieved in response to the cooling process controllability.
Highlights
Technical standards specify the strict requirements on the joint bar mechanical properties and straightness
It was found that a high degree dispersion of the phases and the small grain size provided the best results in stable mechanical properties, which is typical for the sprayer system
The joint bar straightness is achieved in response to the cooling process controllability
Summary
С использованием оптического и растрового электронного микроскопов исследована микроструктура накладки после прокатки (без термообработки), после термоупрочнения по традиционной технологии – закалке в баке с маслом, а также полученной по технологии ускоренного водяного охлаждения, впервые реализованной для такого рода изделий. В результате установлено, что высокая степень дисперсности фаз и малый размер зерна наилучшим образом обеспечивают получение стабильных механических свойств, что характерно для технологии ускоренного водяного охлаждения. Микроструктура накладок до и после объемной закалки в масле исследована с помощью оптического микроскопа
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