Machine Structural Steels. Effect of Boron Nitride on Machinability of Medium Carbon Steel.

Hanyuda, Tomoki; Nakamura, Sadayuki

doi:10.4262/denkiseiko.65.4

Cited by 5 publications

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“…[12][13][14][15] The crystal structure of h-BN is similar to that of graphite, and is easily shear-deformed at the layer boundary. Thus h-BN is expected to improve machinability by promoting deformation in the chip shear region and providing lubrication between the tool and the chip.…”

Section: )mentioning

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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Section: )mentioning

confidence: 99%

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

et al. 2013

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“…9) We have focused on hexagonal boron nitride (h-BN) as a free-cutting additive that improves the machinability of austenitic stainless steels with no anisotropy in the mechanical properties and reduced corrosion resistance. Although studies on h-BN free-cutting steels have mainly been performed on carbon steels such as JIS S45C (AISI 1045), [10][11][12] we have developed an h-BN free-cutting austenitic stainless steel containing homogeneously precipitated spherical h-BN particles with a diameter of 1 to 3 μm.…”

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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“…The first nitride deposit reported to form protective layer was boron-nitride or BN. [4][5][6] Nextly, deposition of AlN on the tool was reported to form for the samples containing BN. [7][8][9][10][11] Further, it was recently reported that the deposition of AlN can take place with the steels even without BN addition.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Cutting Tool Life by AlN Deposition on the Tool

2004

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Machine Structural Steels. Effect of Boron Nitride on Machinability of Medium Carbon Steel.

Cited by 5 publications

References 0 publications

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

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

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

Improvement of Cutting Tool Life by AlN Deposition on the Tool

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