Statistical evaluation of elevated temperature minimum yield/proof stress values for design purposes

Öfverbeck, Per; Ivarsson, Bo; Sandström, Rolf; Östberg, Gustaf

doi:10.1016/0308-0161(85)90048-1

Cited by 7 publications

(3 citation statements)

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“…Figures 13 and 14 compare variability for yield and tensile strengths of the UNS S17400 material of this study do that for aerospace and pressure-vessel ferrous wrought structural alloys, [12,17],structural steels for buildings [18–21],measurements made to evaluate the within-lab and between-lab variability of test technique [9,22], andtwo ferrous alloys made by additive manufacturing [23,24]. …”

Section: Discussionmentioning

confidence: 99%

Mechanical Properties of Austenitic Stainless Steel Made by Additive Manufacturing

Luecke

Slotwinski

2014

J. RES. NATL. INST. STAN.

100

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Using uniaxial tensile and hardness testing, we evaluated the variability and anisotropy of the mechanical properties of an austenitic stainless steel, UNS S17400, manufactured by an additive process, selective laser melting. Like wrought materials, the mechanical properties depend on the orientation introduced by the processing. The recommended stress-relief heat treatment increases the tensile strength, reduces the yield strength, and decreases the extent of the discontinuous yielding. The mechanical properties, assessed by hardness, are very uniform across the build plate, but the stress-relief heat treatment introduced a small non-uniformity that had no correlation to position on the build plate. Analysis of the mechanical property behavior resulted in four conclusions. (1) The within-build and build-to-build tensile properties of the UNS S17400 stainless steel are less repeatable than mature engineering structural alloys, but similar to other structural alloys made by additive manufacturing. (2) The anisotropy of the mechanical properties of the UNS S17400 material of this study is larger than that of mature structural alloys, but is similar to other structural alloys made by additive manufacturing. (3) The tensile mechanical properties of the UNS S17400 material fabricated by selective laser melting are very different from those of wrought, heat-treated 17-4PH stainless steel. (4) The large discontinuous yielding strain in all tests resulted from the formation and propagation of Lüders bands.

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Section: Discussionmentioning

confidence: 99%

Mechanical Properties of Austenitic Stainless Steel Made by Additive Manufacturing

Luecke

Slotwinski

2014

J. RES. NATL. INST. STAN.

100

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“…Wrought alloy The fourth panel contains two data sets on wrought structural alloys. One is from a study [25] of four Swedish pressure-vessel steels made in different steel mills. The other data set comes from from the Metallic Materials Properties Development and Standardization Handbook (MMPDS) [26], which is the authoritative source of designallowable mechanical-properties data for the aerospace industry.…”

Section: ____________________________________________________________mentioning

confidence: 99%

“…This large variability arose despite efforts to control the starting powder, machine, and build conditions. None of these parameters were controlled in the the structural steel [21][22][23][24] and wrought alloy studies [25,26]. Indeed, in those two studies, all of those parameters were deliberately varied to estimate the expected variability in commercial products.…”

Section: ____________________________________________________________mentioning

confidence: 99%

Interlaboratory mechanical-property study for Cobalt-Chromium alloy made by laser powder-bed-fusion additive manufacturing

Slotwinski¹,

Luecke²,

Lass³

et al. 2018

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An eight-laboratory study provided the data to evaluate variability in tensile mechanical properties of cobalt-chrome alloy (UNS R31538) made by metals-based additive manufacturing. In the study, six laboratories employed laser powder-bed-fusion additive manufacturing, and two additional laboratories employed electron-beam powder-bed fusion. For the fve laboratories that employed nominally identical laser powder-bed fusion systems, the between-laboratory variability in yield strength and tensile strength was several times larger than the within-laboratory variability. Microstructural analysis using scanning electron microscopy revealed that each laboratory produced slightly different microstructures. Thermodynamic modeling of the solidifcation and subsequent post-build heat treating demonstrated that the fnal microstructure is sensitive to the exact heat-treating conditions. Key wordsadditive manufacturing; ASTM F75; laser-powder-bed fusion; yield strength.i ______________________________________________________________________________________________________ This publication is available free of charge from: https://doi.

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An improved assessment method for the temperature dependence of yield strength values

et al. 1995

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In Europe work is in progress to establish new standards for materials and it is very important that accurate data are used as a basis for property values in these standards. In addition reliable evaluation methods must be employed when the values are derived. A systematic evaluation method for yield strengths at elevated temperatures has been developed which is a modification of the ISO 2605/111 (ENV22605‐3) procedure. The method has been applied to a number of steel types and has proven to provide values in good accordance with experimental data. Comparisons with existing national and international standards showed the importance of using experimental values when establishing new standards. The method is intended for use in the standard developments by the European Committee for Iron and Steel Standardisation (ECISS).

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Statistical evaluation of elevated temperature minimum yield/proof stress values for design purposes

Cited by 7 publications

References 0 publications

Mechanical Properties of Austenitic Stainless Steel Made by Additive Manufacturing

Mechanical Properties of Austenitic Stainless Steel Made by Additive Manufacturing

Interlaboratory mechanical-property study for Cobalt-Chromium alloy made by laser powder-bed-fusion additive manufacturing

An improved assessment method for the temperature dependence of yield strength values

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