Effect of Addition of Boron and Silicon on Mechanical Properties of P/M SUS630 Stainless Steels.

Kamada, Koichi; Nakamura, Mitsuru; Hara, Hiroshi

doi:10.2497/jjspm.48.810

Cited by 4 publications

(1 citation statement)

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“…The aqueous and high-temperature corrosion resistance of powder metallurgical (PM) stainless steels and their mechanical properties are lower than those of either cast or wrought stainless steels of similar compositions due to the presence of pores in the material. The improvement of the properties of PM steels has traditionally been achieved through a reduction of the porosity [1][2][3][4] or modifying their composition [5]. Si powders have been added to austenitic stainless steel powders to obtain PM stainless steels with a duplex microstructure, increasing the hardness of material and its aqueous corrosion resistance [3].…”

Section: Introductionmentioning

confidence: 99%

Effect of the Si Additions on the Mechanical Behaviour and High-Temperature Performance of Hydrogen Sintered 434L Stainless Steels

Bautista

Velasco

González-Centeno

2009

DDF

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Non-commercial, 434L ferritic stainless steel powders prealloyed with 2% of Si were uniaxially compacted at 700 MPa and sintered in 100% H2 atmosphere for 30 min at three different temperatures (1225, 1250 and 1275 °C). For comparison, standard, commercial 434L powders were sintered in the same conditions, and 434L+2%Si powders were also sintered in vacuum. The porosity and grain size of the 9 sintered stainless steels were measured by image analysis methods. Tensile strength and Vickers hardness tests show that the steels with 2% of Si exhibit higher mechanical properties. Oxidation tests were carried out in air at 800 and 900 °C. H2-sintered 434L steels prealloyed with Si exhibit higher weight gains per unit of apparent surface than 434L steels sintered in the same conditions, due to the higher porosity of the former. The sintering atmosphere affects the nature and morphology of the scales observed by XRD and SEM. Vacuum sintering of 434L+2%Si stainless steels promotes the formation of more protective scales and lower mass gains (for identical porosity volume) than H2 sintering.

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Section: Introductionmentioning

confidence: 99%

Effect of the Si Additions on the Mechanical Behaviour and High-Temperature Performance of Hydrogen Sintered 434L Stainless Steels

Bautista

Velasco

González-Centeno

2009

DDF

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High-temperature oxidation and aqueous corrosion performance of ferritic, vacuum-sintered stainless steels prealloyed with Si

2009

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Effects of Copper Addition on Sintering Behavior of SUS304L Stainless Steel Powders and Mechanical Properties of Their Sintered Compacts

Kanmera¹,

Fujima²,

Takagi³

et al. 2010

J. Japan Inst. Metals

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To study effects of Cu addition on the sintering behavior of SUS304L stainless steel powders and mechanical properties of their sintered compacts, SUS304L, 4 mass Cu pre alloyed SUS304L stainless steel powders and 2 mass Cu mixed these two powders were sintered at 1323～1523 K in vacuum after compacted at the pressure of 490 MPa. In addition to density measurement, micro structural observation and tensile test for each sintered compacts, differential scanning calorimetry and thermomechanical analysis for each powder were conducted.As a result, the sintered compact of 4 mass Cu pre alloyed stainless powder showed higher density and strength than those of other powders due to the formation of small amount of liquid phase. Alloying elements of silicon and manganese in the powders considered to react with copper during sintering and resulted to form liquid phase at relatively low temperature. Moreover, pre alloyed copper more than solubility limit also generated small amount of liquid phase which enhanced the densification and strengthening of the sintered compacts. The sintered compact of 2 mass Cu mixed 4 mass Cu pre alloyed powder showed little lower tensile strength than that of the 4 mass Cu pre alloyed powder because copper over the solubility limit preferentially existed at the grain boundary which played the fracture path at the tensile test.

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Effect of Addition of Boron and Silicon on Mechanical Properties of P/M SUS630 Stainless Steels.

Cited by 4 publications

References 0 publications

Effect of the Si Additions on the Mechanical Behaviour and High-Temperature Performance of Hydrogen Sintered 434L Stainless Steels

Effect of the Si Additions on the Mechanical Behaviour and High-Temperature Performance of Hydrogen Sintered 434L Stainless Steels

High-temperature oxidation and aqueous corrosion performance of ferritic, vacuum-sintered stainless steels prealloyed with Si

Effects of Copper Addition on Sintering Behavior of SUS304L Stainless Steel Powders and Mechanical Properties of Their Sintered Compacts

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