Effect of Isothermal Transformation Heat-treatment Time on Cold Workability of STS 430 Stainless Steel after High Temperature Gas Nitriding

Kim, J.M.; Hyun, Youngmin; Song, Seong-Hun; Kim, G.D.; Son, Yoon-Ho; Sung, J.H.

doi:10.12656/jksht.2014.27.1.15

Cited by 3 publications

(3 citation statements)

References 9 publications

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“…Furthermore, the polarization resistance of specimen #B showed a relatively smaller decrease with increasing temperature than specimen #A, implying that specimen #B has higher stability due to the temperature changes. Thus, the addition of Si and Sn contributed to the improvement in the corrosion resistance of the materials [6]. The corrosion current density (I corr ) was less than 100 µA/ cm 2 for specimen #B compared to specimen #A, indicating that the corrosion rate in the same environment was reduced.…”

Section: Corrosion Testmentioning

confidence: 97%

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Effects of Si and Sn Contents and Heat-Treatment Temperature on the Corrosion Behavior of AISI 439 Ferrite Stainless Steel

Kim¹,

Kim²,

Chung³

2022

Korean J. Met. Mater.

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This study was conducted to evaluate the corrosion resistance and optimize the heat-treatment process of AISI 439 ferrite stainless steel silicon and tin alloys with reduced chromium. The microstructure of the specimens and deposition under each condition were analyzed. The production of oxide films was compared based on the thickness of the film and the change in the contents of each element. In addition, electrochemical analyses of each heat-treatment condition was used to quantitatively compare corrosion resistance and passive film stability based on the relative chromium, silicon, and tin contents. It was found that the addition of silicon and tin compensated for the decrease in corrosion resistance induced by the chromium reduction. The addition of the two elements inhibited iron (Fe) oxide production in the surface oxide film, thereby improving the corrosion resistance of the material and improving the stability of the passive film. Moreover, the SiO2 and SnO2 layers inhibited the production of Fe oxide and contributed to the stability of the film along with Cr2O3, the main component of the passive film. However, when the heat treatment temperature increased above a specific temperature, the oxide inhibitory effect of the two elements was relatively offset. Nevertheless, further research to optimize the content of the three elements will help develop materials with superior mechanical properties and corrosion resistance.

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Section: Corrosion Testmentioning

confidence: 97%

“…Stainless steel undergoes several heat-treatment processes during its manufacture. The secondary annealing process, following roll pressing, is performed several times in a hightemperature atmosphere to effectively remove hydrogen embrittlement inside the material [6]. However, this process results in rapid iron oxidation on the surface.…”

Section: Introductionmentioning

confidence: 99%

Effects of Si and Sn Contents and Heat-Treatment Temperature on the Corrosion Behavior of AISI 439 Ferrite Stainless Steel

Kim¹,

Kim²,

Chung³

2022

Korean J. Met. Mater.

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“…It generally includes three processes [19][20][21]: generation of active nitrogen atoms, surface absorption, and diffusion of nitrogen atoms. The surface of the workpiece after nitriding treatment usually has the characteristics of high hardness [22], good wear resistance [23], high fatigue strength [24], and excellent corrosion resistance [17]. However, the traditional nitriding temperature is high and the nitriding time is long, which not only wastes energy and increases the manufacturing cost of the workpiece but also causes some performance reduction in the workpiece.…”

Section: Introductionmentioning

confidence: 99%

A Review—Effect of Accelerating Methods on Gas Nitriding: Accelerating Mechanism, Nitriding Behavior, and Techno-Economic Analysis

Zhou,

Xia,

Xie

et al. 2023

Coatings

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Gas nitriding, as a surface modification technology to improve the wear resistance of workpiece surfaces, is widely used in wind turbine gears, pressure vessel gears, high-precision die casting abrasives, and other areas. However, the gas nitriding time is too long, reaching 40–60 h, which reduces the efficiency of nitriding and hinders the development of gas nitriding. Therefore, various accelerating methods are born accordingly. This review first introduces the basic principle, microstructure, and process parameters of conventional gas nitriding. Then, five common accelerating methods are summarized: process parameter optimization, surface mechanical nano-crystallization, surface-active catalysis, surface pre-oxidation, and surface laser treatment. Then, the effect of acceleration methods on gas nitriding is analyzed for the acceleration mechanism, nitriding behavior, and nitriding efficiency. Finally, the technical economy of the acceleration methods is compared for three aspects: energy consumption, carbon dioxide emission, and cost. And, the technical maturity of the acceleration methods is compared according to technology readiness level (TRL) technology. Based on the above content, the advantages and disadvantages of the five accelerating methods are reviewed, and the concept of a multi-technology collaborative processing acceleration method is proposed.

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Cold deformation of dezincification resistant yellow brass for plumbing applications

Sivasankaran

Alaboodi

Al-Mufadi

2018

Materials and Manufacturing Processes

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Effect of Isothermal Transformation Heat-treatment Time on Cold Workability of STS 430 Stainless Steel after High Temperature Gas Nitriding

Abstract: This study is to investigate the phase changes and cold workability after isothermal transformation at 780

Cited by 3 publications

References 9 publications

Effects of Si and Sn Contents and Heat-Treatment Temperature on the Corrosion Behavior of AISI 439 Ferrite Stainless Steel

Effects of Si and Sn Contents and Heat-Treatment Temperature on the Corrosion Behavior of AISI 439 Ferrite Stainless Steel

A Review—Effect of Accelerating Methods on Gas Nitriding: Accelerating Mechanism, Nitriding Behavior, and Techno-Economic Analysis

Cold deformation of dezincification resistant yellow brass for plumbing applications

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