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Ono, Kiyoo; Yanagida, Minoru; Kohno, Tomio; Shibata, Noriyoshi

doi:10.4262/denkiseiko.54.265

Cited by 7 publications

(2 citation statements)

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“…1,2) Various types of free-cutting steels that contain alloying elements, such as lead (Pb) and sulfur (S), which form freecutting inclusions, are widely used. [3][4][5][6][7] However, further use of materials with lead additives is not feasible because of environmental and recyclability concerns. In addition, JIS SUS303 (AISI Type 303) steel, a widely used sulfur-added free-cutting austenitic stainless steel, has drawbacks such as anisotropic mechanical properties arising from the elongated shape of the manganese sulfide (MnS) free-cutting additives along the rolling direction, 8) and deteriorated corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

Effect of Additional Boron Amount on Surface Roughness after Lathe Turning in h-BN Dispersed Type 304 Stainless Steels

et al. 2016

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The authors have reported that the machinability (lathe turning, drilling and sawing) of SUS304 (Type 304) austenitic stainless steel is improved by precipitating hexagonal boron nitride (h-BN). In this study, we investigated the surface roughness after lathe turning in the h-BN precipitated SUS304 steels, where the nitrogen content was fixed at 0.2% and the boron content was changed as 0, 0.03, 0.05, and 0.1% (mass%). Surface roughness increased as the boron content increased, especially at a lower cutting speed of 22 m/min. However, SUS304 steel with boron content of up to 0.05 mass% had similar or smaller surface roughness compared with a commercial SUS304 steel, and the SUS304 steel containing 0.1 mass% boron had smaller surface roughness compared with a SUS303 (Type 303) sulfur-added free-cutting steel. Precipitation of h-BN increased the size of the build-up edge and increased the surface roughness. On the other hand, solute nitrogen increased the Vickers hardness, leading to decreased separation size of the build-up edge and decreased surfaced roughness.

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Section: Introductionmentioning

confidence: 99%

Effect of Additional Boron Amount on Surface Roughness after Lathe Turning in h-BN Dispersed Type 304 Stainless Steels

et al. 2016

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“…6) However, environmental and recyclability concerns have made it difficult to continue using materials with lead additives. Adding sulfur to steel is one well-known method for producing a lead-free free-cutting steel.…”

Section: Introductionmentioning

confidence: 99%

Machinability Improvement and Its Mechanism in SUS304 Austenitic Stainless Steel by Precipitated Hexagonal Boron Nitride

et al. 2013

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To improve the machinability of SUS304 (Type 304) austenitic stainless steels, specimens were prepared containing 0.016 mass% boron and 0.2 mass% nitrogen, and hexagonal boron nitride (h-BN) particles with a diameter of 1 to 5 μm were precipitated. Precipitation of h-BN reduced the cutting force and tool wear during lathe turning with a cemented carbide tool insert, especially at cutting speeds of 40 m/min and higher. The reduction in cutting force appeared attributable to internal lubrication by h-BN in the chip shear region and the deformation flow layer, as well as to lubrication between the chip and carbide tool. Improved chip disposability and tool wear suppression were also achieved by h-BN precipitation. SUS304 steel with precipitated h-BN was found to exhibit good machinability in drilling and sawing operations with high-speed steel tools.

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Traditional Machining of Stainless Steels

2015

Machining of Stainless Steels and Super Alloys

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Cited by 7 publications

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Effect of Additional Boron Amount on Surface Roughness after Lathe Turning in h-BN Dispersed Type 304 Stainless Steels

Effect of Additional Boron Amount on Surface Roughness after Lathe Turning in h-BN Dispersed Type 304 Stainless Steels

Machinability Improvement and Its Mechanism in SUS304 Austenitic Stainless Steel by Precipitated Hexagonal Boron Nitride

Traditional Machining of Stainless Steels

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