Recent research into NM450 high-strength low-alloy wear-resistant steel has unveiled significant advancements in its microstructure and mechanical properties, promising to reshape applications in the construction sector. Conducted by a team from the State Key Laboratory of Refractory Materials and Metallurgy at Wuhan University of Science and Technology, the study highlights how specific heat treatments can enhance the steel’s performance, making it an attractive option for industries that demand durability and resilience.
The researchers, led by Wu Zhennan, explored the effects of quenching and tempering at varying temperatures on NM450 steel. Their findings revealed that quenching at 840 °C and tempering at 200 °C resulted in a microstructure predominantly composed of lath martensite with a small amount of ferrite. This combination not only improves strength but also significantly boosts wear resistance. “The steel quenched at 880 °C and tempered at 200 °C demonstrated the best strength and wear-resistance performance, which is crucial for applications in harsh environments,” said Wu.
This research indicates that the yield strength of NM450 ranges from 1,142 MPa to 1,173 MPa, with tensile strength reaching between 1,553 MPa and 1,599 MPa. Such impressive mechanical properties stem from a strengthening mechanism that combines dislocation strengthening, fine grain strengthening, and solid solution strengthening. The implications for the construction industry are profound, as wear-resistant materials are essential for machinery, tools, and structural components that face abrasive conditions.
The study also delves into the wear mechanisms at play, revealing that the primary form of wear is plastic deformation, characterized by furrows and grinding chips. This insight is vital for manufacturers aiming to enhance the longevity of their products in high-stress environments. “Understanding the microstructural changes and their impact on wear resistance allows us to tailor steel compositions for specific applications,” Wu added.
As construction projects increasingly incorporate advanced materials to meet stringent performance standards, the findings from this research could lead to broader adoption of NM450 steel in various applications, from heavy machinery to structural components. The potential for improved efficiency and reduced maintenance costs could drive significant commercial benefits, making this a timely study for industry stakeholders.
Published in ‘Teshugang’, which translates to ‘Iron and Steel’, this research underscores the ongoing innovation in materials science that could redefine the standards for wear-resistant steel. As industries continue to prioritize durability and performance, the insights gained from this study will likely influence future developments in steel technology and its applications in construction and beyond. For more information about the research team, visit lead_author_affiliation.
