Improved Microstructure and Mechanical Properties of Fe-Cr-Mo-V-N Steel by Controlling the Quenching Temperature

Abstract

Nitrogen is an alloying element that can significantly improve the yield strength of steel by means of interstitial solid solution strengthening. The effects of quenching temperature on the evolution of second phase and grain size were investigated, as well as tensile properties, impact energy and hardness of a new nitrogen-alloyed Fe-Cr-Mo-V-N steel. The results show that with the increase of quenching temperature, the number and size of the second phase decrease as the high temperature promotes the dissolution and refinement of the second phase. For instance, the number of second phase M 23 C 6 particles decreases gradually with temperature increasing. When the quenching temperature reaches 1050 °C, the grain is refined. Under the same tempering treatment, with the increase of quenching temperature, the tensile properties, impact energy and hardness increase first and then decrease. When the quenching temperature is 1050 °C and the tempering temperature is 180 °C, the obtained mechanical properties are the best. Under this condition, the tensile strength at room temperature is 2110 MPa, the yield strength is 1620 MPa, and the impact energy is 29.1 J, respectively.

Study on the High Temperature Tensile Properties and Strengthening Mechanism of Nitrogen Containing Nickel‐Based Deposited Metals

“…The increase of nitrogen element content can improve the yield strength (YS) and tensile strength of austenitic stainless steel. [4] It is an urgent issue to consider using nitrogen instead of some nickel to develop low-cost nickel-based welding materials. This has a profound impact on the development of low-cost nickel-based welding materials.…”

Constitutive Equation for the Hot Deformation and Microstructure Evolution of 12Cr‐F/M Steel

“…Furthermore, the manufacturing process strongly influences the mechanical performances of specific products because it involves industrial fabrication routes such as hot extrusion with multi‐pass hot rolling. [ 18–21 ]…”

“…Furthermore, the manufacturing process strongly influences the mechanical performances of specific products because it involves industrial fabrication routes such as hot extrusion with multi-pass hot rolling. [18][19][20][21] Limited research exists on the hot extrusion process entailed in RAFM claddingtube manufacturing despite its significant effect on the mechanical performance and metallurgical features of the products. Nevertheless, there have been preliminary studies on the hot deformation behavior of RAFM cladding tubes.…”