Austenite stabilization at room temperature in medium Mn DP steels through CPPT

The presence of retained austenite (RA) has been proven beneficial for the formability of Advanced High Strength Steels. Therefore, multiple thermal austenite stabilization methods have been researched, such as Mn-partitioning during intercritical annealing in medium Mn steels. The Cyclic Partial Phase Transformation (CPPT) approach has been...

Investigation of the microstructural distribution in a trailing arm made of silicon-containing spring steel

The presence of bainite and retained austenite in advanced high-strength steels (AHSS) has grown a great interest in the automotive industry as simultaneously provides strength and the transformation-induced plasticity (TRIP) effect. This type of microstructure is present in modern trailing arms. A trailing arm is part of the air suspension...

Influence of Quenching Temperature and Mn Content on the Microstructure Development of New Q&P Processed Martensitic Stainless Steels

Quenching and Partitioning (Q&P) is a novel steel heat treatment to create microstructures containing martensite and retained austenite. In recent years, there has been a growing interest in applying Q&P treatments to martensitic stainless steels with the aim to create stainless steels with the mechanical properties...

The Effect of Prior Ferrite on Bainite Transformation Kinetics

In this work the effect of ferrite on the formation of bainite is studied. Different ferrite fraction of up to 25% were obtained through the application of three different intercritical annealing treatments to an Fe-0.2C-3Mn-2Si (wt%) steel. Two of the heat treatments consisted of an isothermal hold at temperatures between 835°C and 950°C, which...

Architectured MIcrostructures: The effect of localized laser heat treatment on the microstructure of a FeCNi steel

Laser surface treatments offer interesting prospects for the creation of architectured microstructures formed by distinct phases in metastable austenitic steels. In the present study, a laser-based localised heat treatment was developed to locally create an austenitic region in a quenched Fe25Ni0.2C martensitic microstructure. The highly...

Reheating Quenching And Partitioning Microstructures To Modify Phase Fractions

Abstract<br/>The Quenching and Partitioning (Q&amp;P) process starts with an austenitization process followed by rapid cooling to a temperature named quenching temperature ranged between the martensite start (M_s) and martensite finish (M_f) temperatures to establish initial fractions of martensite and austenite. Afterwards,...