Mechanical properties of cold-rolled metastable Cr–Mn–Ni–N austenitic stainless steel at low ambient temperature

Zhang, Yichong; Li, Moucheng; Bi, Hongyun; Chen, Dexiang; Gu, Jiaqing; Chang, Edmond Chin‐Ping

doi:10.1016/j.msea.2019.05.045

Cited by 10 publications

(6 citation statements)

References 41 publications

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“…The reason is that δ ferrite is relatively soft due to its low carbon content and dislocation density, and the ferrite deforms preferentially under stress, resulting in the formation of crack source. In this study, there are many δ ferrite distributed along the original austenite grain boundary in the test steel without N, and some studies have pointed out that in the range of 500–1000°C, δ ferrite will undergo phase eutectoid reaction and transform into M 23 C 6 lamellar structure, which makes the steel embrittlement, thus resulting in the reduction of impact toughness [28–30]. With the increase of tempering temperature, the elongation of test steel containing N decreases first and then increases.…”

Section: Resultsmentioning

confidence: 99%

Effect of nitrogen and tempering temperature on microstructure evolution and mechanical properties of 0Cr15Ni6Mo2 martensitic stainless steel

Zhang

et al. 2021

Ironmaking & Steelmaking

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The effects of nitrogen and tempering temperature on microstructure evolution and mechanical properties of 0Cr15Ni6Mo2 martensitic stainless steel are studied by means of the OM, SEM, XRD and TEM. The results show that the addition of 0.12% N can effectively inhibit the formation of δ ferrite and significantly increase the volume fraction of retained austenite. N can inhibit the precipitation of carbides, but it promotes the precipitation of Cr2N in the grain boundary of original austenite, martensitic lath boundary and grain interior in the 0Cr15Ni6Mo2 with N. The addition of 0.12% N not only increases the tensile strength by at least 9.6% but also increases the elongation and Charpy impact toughness by at least 12.3% and 47.5%, respectively. And N increases the yield ratio and improves the work hardening ability of the test steel. It is considered that the increase of retained austenite, the inhibition of the formation of δ ferrite and the segregation and precipitation of Cr2N at grain boundaries play an important role. Comprehensive mechanical properties are more likely to obtain when tempered in 700-750°C.

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Section: Resultsmentioning

confidence: 99%

Effect of nitrogen and tempering temperature on microstructure evolution and mechanical properties of 0Cr15Ni6Mo2 martensitic stainless steel

Zhang

et al. 2021

Ironmaking & Steelmaking

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“…However, the solubility of Mn in Al 2 O 3 oxide film is almost zero, which does not impair the protective effect of the Al 2 O 3 oxide film [ 9 , 10 , 11 ]. Therefore, it is possible to develop low-cost and high-performance AFA steel by substituting Mn for Ni [ 12 , 13 , 14 , 15 , 16 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

“…In austenitic stainless steel welded metal, Mn can replace Mo in the σ phase, which prevents the formation of an Mo depletion zone, and thus improves the critical pitting temperature [ 15 ]. In Cr–Mn–Ni–N austenitic stainless steel, higher strength and elongation were obtained by substituting Mn for Ni [ 16 ]. In high Ni austenitic steel, the effect of 6.9 weight % Mn instead of 6 weight % Ni and the tensile properties at high temperature were improved and the cost was reduced by 10%, which made the commercial application possible [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Replacing Ni with Mn on the Microstructure and Properties of Al2O3-Forming Austenitic Stainless Steels: A Review

Chen,

Du,

Zhou

2023

Materials

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Al2O3-forming austenitic steel (AFA steel) is an important candidate material for advanced reactor core components due to its excellent corrosion resistance and high temperature strength. Al is a strong ferrite-forming element. Therefore, it is necessary to increase the Ni content to stabilize austenite. Ni is expensive and highly active, and so increasing the Ni content not only increases the costs but also damages the radiation resistance. Mn is a low-cost austenitic stable element. Its substitution for Ni will not only help to improve the irradiation resistance of austenitic steel, but also reduce the cost. In order to explore the feasibility of Mn-substituted Ni-stabilized austenite in AFA steel, this paper summarized the research progress of Mn-added AFA steels, whilst the research status of traditional Mn-added austenitic steels are also referred to and compared herein. The effect of the addition of Mn on the microstructure and properties of AFA steel was analyzed. The results show that Mn can promote the precipitation of the M23C6 phase and inhibit the precipitation of the B2-NiAl phase and secondary NbC phase. With the increase in Mn content, the strength of AFA steel at room temperature and high temperature decreased slightly, the room temperature elongation increased slightly, while the high temperature elongation and creep resistance decreased obviously. In addition, for austenitic steel free of Al, the addition of Mn will destroy the oxide layer of Cr2O3, which will decrease the oxidation resistance of the steel. But the preliminary study shows that Mn has little effect on the Al2O3 oxide layer. It is worth studying the effect of Mn-substituted Ni on the oxidation resistance of AFA steel. In summary, more efforts are necessary to investigate the optimal Mn content to balance the advantages and disadvantages of introducing Mn instead of Ni.

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“…Then, a series of Cr-Ni-Mo-N stainless steel was developed between 1980s and 1990s [19]. It had been reported that these superaustenitic stainless steels exhibit very high corrosion resistance owing to their high contents of Cr, Ni, Mo and N [20]. Meanwhile, such high contents of alloy elements also induce the precipitation of intermetallic as chi or sigma phases in steel substrate upon thermal ageing [21][22][23], which are associated with the degradation of mechanical properties (especially the impact toughness) of SS.…”

Section: Introductionmentioning

confidence: 99%

Pitting Performance of Cold- and Hot-Rolled Nickel-Saving High-Strength Metastable Austenitic Stainless Steel

Zou

Huang

et al. 2022

Coatings

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Nowadays, nickel-saving metastable austenitic stainless steel (MASS) has become the right solution to meeting the growing requirement of higher strength, better corrosion resistance and more cost saving for the automobile industry. Better understanding of the pitting mechanism of the MASS after either cold- or hot-rolled can offer guidance for the producing of high-performance automobile steel. In the current work, for uncovering the pitting mechanism of the cold- and hot-rolled MASS, the microstructural evolution and pitting performance of nickel-saving metastable austenitic stainless (MASS) steel after cold- (CR) and hot-rolling (HR) were researched via electron microscopy technique and electrochemical methods. Austenite composites the main phase of the MASS. Small amounts of martensite film were proven to form in the MASS. The precipitation of Cr-rich M23C6 carbides was observed in the CR-MASS, while no carbides existed in the HR-MASS. The pitting resistance of the HR-MASS was better than the CR-MASS, which could be attributed to the fact that the stable pits in CR-MASS were initiated near the carbides, whereas the MnS inclusion would serve as the initiation sites for stable pits in HR-MASS. Findings in this work will provide a guidance for developing new generation MASS for automobile industry.

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Mechanical properties of cold-rolled metastable Cr–Mn–Ni–N austenitic stainless steel at low ambient temperature

Cited by 10 publications

References 41 publications

Effect of nitrogen and tempering temperature on microstructure evolution and mechanical properties of 0Cr15Ni6Mo2 martensitic stainless steel

Effect of nitrogen and tempering temperature on microstructure evolution and mechanical properties of 0Cr15Ni6Mo2 martensitic stainless steel

The Effect of Replacing Ni with Mn on the Microstructure and Properties of Al2O3-Forming Austenitic Stainless Steels: A Review

Pitting Performance of Cold- and Hot-Rolled Nickel-Saving High-Strength Metastable Austenitic Stainless Steel

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