les aciers de construction à haute usinabilité avec soufre et oxygène

Thivellier, D.; Rousseau, D.; Tricot, R.

doi:10.1051/metal/197774010021

Cited by 2 publications

(2 citation statements)

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“…From the machinability point of view, the key criteria are cutting force, smoothness of the machined surface, chip shape, tool life, and possibly also the coefficient of friction and cutting temperature [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Bismuth on Technological and Material Characteristics of Low-Alloyed Automotive Steels with a Good Machinability

Kurka

Kuboň

Kander

et al. 2022

Metals

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The aim of this work is to compare the technological and material properties of CMnCr steels without bismuth, with 0.08 wt. % Bi and 0.12 wt. % Bi. Experimental heats showed that the most advantageous alloying of Bi into the heat was in the ladle, with an efficiency of about 20%. The optimal temperature range for forming steel was found to be 1160–1050 °C. With increasing Bi content, the formability of steels and plastic properties decreased, while the yield stress and tensile strength increased. Manganese sulfides, aluminum oxides, or oxysulfides, which were segregated both individually and in clusters, were found in the matrix of all tested steels. In steels with Bi, the Bi particles segregate the separately in the form of globules, either as envelopes of elongated MnS or Al2O3 particles segregated in rows. Sulfur dot-shaped segregations in the steel with 0.12 wt. % of Bi and the steel without Bi were essentially uniform over the whole area. For the steel with 0.08 wt. % of Bi, both dot-like and ray-ordered sulfur segregations were observed. The microstructure of all tested steels was ferritic–pearlitic with islands of bainite. Towards the center of the forged bars, variable shape and size of bainite blocks were observed. Machinability tests evaluated by the extend of tool wear showed that the most advantageous was CMnCr steel alloyed with 0.08 wt. % Bi.

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Section: Introductionmentioning

confidence: 99%

“…In terms of the better machinability of the material, the presence of a smaller number of large inclusions in the matrix is more advantageous than a large number of small inclusions [14]. Several innovative methods for managing and controlling the morphology of MnS inclusions have been patented [5,15,16].…”

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confidence: 99%