Influence of Finish Rolling Temperature on Microstructure and Mechanical Properties of a 19Cr1.5Mo0.5 W Ferritic Stainless Steel

Abstract

A 444-type heat-resistant ferritic stainless steel containing 0.05 wt% Ce (rare earth element) and 2 wt% (Mo + W) was adopted as an experimental material to study the effect of finish rolling temperature on microstructure and texture evolution as well as on mechanical properties and formability. The rolling processes contain hot rolling at two different finish rolling temperatures (860 °C and 770 °C) and annealing, cold rolling and subsequent annealing. It was found that the microstructures after hot rolling and annealing could be refined by lowering finish rolling temperature. The resultant microstructures after cold rolling and annealing were hereditarily refined. Lowering finish rolling temperature can weaken α-fiber texture in hotrolled or cold-rolled ferritic stainless steel strip, while γ-fiber texture in the final product was homogeneously strengthened. Additionally, enhanced mechanical property and formability in terms of strength and average plastic strain ratio could be obtained via decreasing finish rolling temperature.

High-Temperature Cyclic Oxidation Behavior and Microstructure Evolution of W- and Ce-Containing 18Cr-Mo Type Ferritic Stainless Steel

“…In order to obtain heat-resistant ferritic stainless steel with excellent oxidation resistance and considering the above requirements, some research studies have been conducted on related ferritic stainless steel through alloying. These studies have shown that the addition of the alloying element W enhances the high-temperature fatigue performance through precipitation or solid solution strengthening [3] and significantly increases the high-temperature tensile strength [4]. Furthermore, adding alloying elements such as W can improve the thermal mechanical fatigue performance of medium chromium stainless steel [5].…”

Three-dimensional temperature field distribution of thin medium plate during finishing rolling and its effect on shape control

“…In the process of rolling plates, temperature is deemed a vital parameter. The temperature of the rolled piece not only affects the structural and mechanical properties of the plate [1,2], but also impacts the rolling force and the shape control [3,4].…”