New type of Pb‐free Machinable Soft‐Magnetic Stainless Steels with Dispersed Titanium Carbo‐Sulfide

Ebata, Takashi; Takiguchi, Tsunemi; Shimizu, Tetsuhide; Oikawa, Katsunari; Mitsui, Hajime; Ishida, K.

doi:10.1002/adem.200400047

Cited by 8 publications

(3 citation statements)

References 12 publications

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“…However, the toxicity of Pb is a problem from the standpoint of environmental protection. We have recently developed new types of Pb-free machinable stainless steels with dispersed titanium carbo-sulfide, 17,18) where thermodynamic database on sulfide in steel plays the vital role in alloy design. Figure 4 shows the isothermal section diagram of Fe0.21Si0.7Mn 16.5Cr0.55TiCS (mass%) alloy at 800°C.…”

Section: Alloy Design Of Fe-based Alloysmentioning

confidence: 99%

Alloy Design and Development of Advanced Materials Based on Phase Diagrams and Microstructural Control

Ishida

2020

Mater. Trans.

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Recent progress in the development of advanced materials based on the study of CALPHAD approach to the phase diagrams and microstructural control is presented. Thermodynamic databases on the FeS based system, FeMnAl based alloys, Cu-based alloys and Cobased superalloys have been constructed. By utilizing these databases and information on phase diagrams, the following advanced materials have been designed and developed; (i) Schaeffler-type Ti-based alloys, (ii) Pb-free machinable stainless steels using titanium carbosulphide, (iii) high strength FeMn based alloys with low density, (iv) FSW (Friction Stir Welding) tool using Co-based superalloy strengthened by £ A (Co 3 (Al, W)) phase, (v) Ni based metamagnetic shape memory alloys, (vi) CuNiAl based alloys with high strength and high electronic conductivity strengthened by £ A (Ni 3 Al) phase, and (vii) Ingrown nail correcting device and seismic application using CuAlMn based shape memory alloys. The alloy design and practical application of these materials focussing on the use of phase diagrams have been presented.

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Section: Alloy Design Of Fe-based Alloysmentioning

confidence: 99%

Alloy Design and Development of Advanced Materials Based on Phase Diagrams and Microstructural Control

Ishida

2020

Mater. Trans.

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“…Recently, it is reported that the Ti 4 C 2 S 2 is also effective to improve the cold workability of stainless steels as well as the improvement of the corrosion resistance, because Ti 4 C 2 S 2 suppresses the precipitation of MnS and Cr 23 C 6 and scavenging C and S from the matrix [37]. In addition, it has been reported that the Ti 4 C 2 S 2 dispersion has significan effect to improve the machinability of stainless steels [38,39] and invar alloys [5], which are expected as a Pb-free machinable alloys. Several thermodynamic calculations for stainless steels and Fe-Ni based invar alloys are shown hereinafter.…”

Section: Stainless Steels and Invar Alloysmentioning

confidence: 99%

A Thermodynamic Database for Fe-Cr-Mn-Ni-Ti-S-C-N System

Oikawa

Mitsui²,

Ishida

2005

MSF

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A database for thermodynamic information of sulfides and carbo-sulfide in steels has been developed, where the thermodynamic properties of the relevant constituting sub-system of the complex system have been assessed by the CALPHAD (Calculation of Phase Diagrams) approach. The utility of this database is demonstrated in examples of phase diagram calculations of low carbon steels and stainless steels. The calculated results are in good agreement with experimental data. The developed thermodynamic database would be useful in predicting the formation of sulfides and carbo-sulfides in the commercial steels.

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“…510) Recently, a new free-cutting soft-magnetic stainless steel with Ti 4 C 2 S 2 inclusions rather than MnS has been developed. 11) In the case of conventional free-cutting stainless steels, the corrosion resistance of the Ti 4 C 2 S 2 inclusions is higher than that of MnS inclusions. 12,13) It has been reported that the absence of anodic dissolution of Ti 4 C 2 S 2 inclusions in a conventional 18Cr-8Ni austenitic stainless steel can be attributed to the formation of a Ti-enriched oxide layer, and that no pitting initiates at the inclusions as a result.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Resistance of a Free-Cutting Soft-Magnetic Stainless Steel in Pure Water

Sugawara

Naruse²,

Ebata³

et al. 2015

Mater. Trans.

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The corrosion resistance of a new free-cutting soft-magnetic stainless steel containing Ti 4 C 2 S 2 instead of MnS was examined by immersion corrosion tests in pure water and anodic polarization measurements in 0.1 M Na 2 SO 4. The Ti 4 C 2 S 2 inclusions hardly dissolved in pure water at 353 K and did not suffer anodic dissolution in the passivity region of stainless steel in 0.1 M Na 2 SO 4. In contrast, conventional free-cutting softmagnetic stainless steels with (Mn,Cr)S inclusions caused the significant release of Mn species during immersion in pure water, and showed a marked increase in the dissolution current of MnS under anodic polarization in 0.1 M Na 2 SO 4. The thermodynamic stability of Ti, Mn and Cr oxide films on the inclusions makes the difference in the corrosion resistance of Ti 4 C 2 S 2 and (Mn,Cr)S, with no dissolution of Ti from Ti 4 C 2 S 2 and the selective dissolution of Mn from (Mn,Cr)S.

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New type of Pb‐free Machinable Soft‐Magnetic Stainless Steels with Dispersed Titanium Carbo‐Sulfide

Cited by 8 publications

References 12 publications

Alloy Design and Development of Advanced Materials Based on Phase Diagrams and Microstructural Control

Alloy Design and Development of Advanced Materials Based on Phase Diagrams and Microstructural Control

A Thermodynamic Database for Fe-Cr-Mn-Ni-Ti-S-C-N System

Corrosion Resistance of a Free-Cutting Soft-Magnetic Stainless Steel in Pure Water

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