Abstract
To deal with the problem of poor yield strength and hardness in the initial use of high-manganese austenitic steel, we investigated the alloying design, microstructure, precipitates, mechanical properties, and comprehensive strengthening mechanism of high-manganese austenitic steel through two novel heat-treatment processes, namely continuous heating process (CHP) and segmented heat preservation process (SHPP). In this work, austenitic Fe-0.9C-17Mn-0.8Si-2.0Cr-0.3Ni-0.5Cu-0.7Mo steels alloyed with Ti, V, and Nb were designed. The grain size of SHPP steels was smaller than that of CHP steels due to the smaller size of precipitates. The results of mechanical experiments showed that the yield strength and impact toughness of SHPP steel were obviously higher than those of CHP steel, but the Brinell hardness of CHP steel was higher than that of SHPP steel. The higher Brinell hardness and poorer impact toughness of CHP steel were mainly due to the larger-sized precipitates. Finally, solid-solution strengthening played the most effective role of increasing the yield and tensile strengths of the two steels.
Highlights
In the past few years, a great deal of studies have been carried out to develop new-generation steels with significantly improved strength–toughness synergy for excellent wear-resistance applications.with the upsizing of mining and rapid development of the automotive industry, high-manganese austenitic steel has received more attention due to its excellent mechanical properties, as it combines excellent wear-resistance and work-hardening capacity with high ductility and impact toughness [1,2,3]
The results showed that the precipitates in segmented heat preservation process (SHPP) steel were smaller; the use of Ti-V-Nb alloying with SHPP heat-treatment could
The microstructure and mechanical properties of Ti-V-Nb-alloyed austenite manganese steel were investigated and the following main conclusions can be drawn: (1) Through the continuous heating process (CHP) and SHPP, the larger-size particles of alloying element precipitates in cast high-manganese steel were dissolved into the steel, which resulted in a significant solid-solution strengthening effect
Summary
In the past few years, a great deal of studies have been carried out to develop new-generation steels with significantly improved strength–toughness synergy for excellent wear-resistance applications.with the upsizing of mining and rapid development of the automotive industry, high-manganese austenitic steel has received more attention due to its excellent mechanical properties, as it combines excellent wear-resistance and work-hardening capacity with high ductility and impact toughness [1,2,3]. ZGMn13Cr2 steel has been widely used for a long time in metallurgy, mining, construction materials, railroading, and power industry as well as the manufacture of cement owing to its high work-hardening capacity and impact toughness under high-load impact and heavy stress [4]. This steel is unable to fulfil the requirements of high initial hardness and yield strength under low load impact or in the first stages of use [1].
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