Phase transformation studies af a low alloy steel in the (α + γ) phase region

Abstract

This research work describes a thermo mechanical investigation of a low alloy steel treated in the (a + γ) phase region. The aim is to develop a high tensile, ductile microstructure that could have a wide range of engineering applications. Recent advances in the area of precipitation, recrystallization mechanisms, and a / γ transformations provide strong background to this study. In a preliminary heat treatment, various microstructures (normalized and 450 °C tempered martensite structure) were produced and deformed to varying degrees. Subsequently, these microstructures were subjected to various intercritical temperatures (740 and 760 °C) for various times and a very high cooling rate. Light (optical) microscopic investigations were carried out to study the ensuing microstructures. Mechanical testing results (tensile and hardness values) were used to characterize the structures obtained. On analysis of the result, it was observed that well defined micro-duplex structures of ferritic and martensitic nature, possessing good combinations of strength and ductility were obtained.

DP600 Çeliğinin Mekanik Özelliklerine Çift Gerinim Yaşlanma İşleminin Etkisi

“…Bahsedilen tüm bu özellikler, sahip oldukları martenzit parçacık hacim oranı ve morfolojisi ile doğrudan etkilenmektedir. Alaneme [5], ısıl işlem parametrelerinin mikroyapı düzeni üzerine önemli etkileri olduğunu belirtmiştir. Dolayısı ile çift fazlı çeliklerin mekanik özellikleri için ısıl işlem parametreleri çok önemlidir.…”

Effects of Heat Treatment on the Microstructure and Mechanical Properties of Low-carbon Microalloyed Steels

“…On the other hand, it has been found that higher hardness values were obtained in microalloyed steel by cooling rate due to phases [10]. Although many papers about the cooling rate effect on tensile behaviours of steels have been published in steels and alloys [11][12][13][14], there are few studies on the effects of cooling rate on the microstructure and microhardness [15][16][17]. Especially, the cooling rate effect on the microhardness of low-carbon microalloyed steels has not been reported in literature.…”

Influence of tempered microstructures on the transformation behaviour of cold deformed and intercritically annealed medium carbon low alloy steel

“…Dual phase steels have found continued relevance in the automobile industries because of its unique high strength to weight ratio, formability, energy savings and crash energy management [1][2][3][4][5][6][7][8][9][10] . This has made them suitable for the production of car body parts, wheel rims, and a good number of structural parts.…”