Abstract
A new maraging stainless steel with superior strength–toughness–corrosion synergy has been developed based on an innovative concept of alloy design. The high strength–toughness combination is achieved by forming dispersive nano-sized intermetallic compounds in the soft lath martensitic matrix with a slight amount of residual austenite. The good corrosion resistance is guaranteed by exactly controlling the Co content based on understanding the synergistic effect between Co and Cr. The fine structure characteristics of two dominant strengthening precipitations including Ni3Ti and Mo-rich phases were finely characterized associated with transmission electron microscope (TEM) and atom probe tomography (APT) analyses. The relationship among microstructure, strength and toughness is discussed. The precipitation mechanism of different precipitates in the new maraging stainless steel is revealed based on the APT analysis.
Highlights
Maraging stainless steels (MSS) are a class of high strength stainless steels with excellent comprehensive performances including high strength, superior corrosion resistance and good weldability, etc. [1,2,3,4,5]
The corrosion current density obtained from Potentiodynamic polarization (PDP) scans was used as an indicator of corrosion resistance
Fracture toughness of IMR steel shows notable advantage compared to those maraging stainless steels
Summary
Maraging stainless steels (MSS) are a class of high strength stainless steels with excellent comprehensive performances including high strength, superior corrosion resistance and good weldability, etc. [1,2,3,4,5]. Higher content of C could present a gradual incremental trend to form chromium carbides, which are harmful for both toughness and corrosion resistance [15,16] Another method is to add more strengthening elements to increase the strength by precipitation hardening. Most strengthening elements such as Mo, Ti and Al are ferrite formation elements and they will promote the formation of delta-ferrite, which is harmful to the toughness Different from those strengthening elements, Co is often added to increase the strength of maraging stainless steel by its synergistic effect with strengthening elements such as Ti and Mo [11,12,13,14]. The IMR steel exerts a high strength in combination with high toughness and good corrosion resistance, showing outstanding performance compared with other commercial maraging stainless steels. It is expected that the new maraging steel will have potential applications in the aircraft, power generation, tools and automotive industries
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