The focus of this study is the degradation of a near pearlitic microstructure under combined mechanical and thermal loadings leading to changes in mechanical properties. More specifically, it is examined how the orientation gradients inside the pearlite colonies, affect the spheroidisation. Samples were extracted from virgin near pearlitic railway wheels and prestrained, thereafter heat treated...

Abstract This research paper mainly studied the microstructure and hardness of weld bead welding heat affected zone ultrafine grain steel after CO 2 gas-shielded welding. After normalizing quenching treatment, changes in welded joints were studied. These experimental results showed that joint was dendritic. The a mixed structure proeutectoid ferrite, side plate bainite, pearlite. overheated HAZ...

In present paper, the relationship between fatigue and wear of three kinds pearlite wheel steel samples is investigated by using rolling tester under 0.2% slip ratio condition. The results show that weight loss, surface hardness thickness plastic deformation layer are increased as increase cycles during process. loss G1 sample highest owing to existence a large amount proeutectoid ferrite (PF)g...

This paper focuses on the evolution of microstructure in a grain-oriented electrical steel (GOES) thin strip after casting. After solidification, consisted delta-ferrite. A small fraction austenite was formed during cooling two-phase region (gamma+delta). Fine Cr2CuS4 particles precipitated ferrite and along delta/gamma interfaces. Laths primary Widmanstätten (WA) nucleated directly high-angle ...

High silicon and molybdenum ductile cast irons (Si-Mo alloys) are commonly used as exhaust manifold materials suffering from high temperature-oxidation thermal-mechanical fatigue. The structural integrity of Si-Mo alloys under these service conditions is attributed to their microstructure consisting spheroidal graphite Mo-rich carbide embedded in a ferritic matrix. However, the structure includ...

When using traditional metallographic techniques, materials scientists often make assumptions about the shape, distribution and connectivity of three-dimensional features that lie buried within the material. Recent work has shown that these assumptions can be incorrect. An approach to threedimensional analysis of microstructures is demonstrated here in three different alloy steels. Proeutectoid...

Abstract In this study, the effect of cooling rate controlled by different castings thickness ranging from 3 to 25 mm on mechanical and corrosion behavior Si–Mo ductile iron (DI) was investigated. SEM-EBSD investigations demonstrated that nodule counts, nodularity, ferrite phase increased while ferritic grain size decreased with decreasing in casting wall thickness; turn led improvements tensil...