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    On Shear Instability in Machining a Nickel-Iron Base Superalloy

    Source: Journal of Manufacturing Science and Engineering:;1986:;volume( 108 ):;issue: 002::page 93
    Author:
    R. Komanduri
    ,
    T. A. Schroeder
    DOI: 10.1115/1.3187056
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: The deformation in chips produced in machining a nickel-iron base superalloy (Inconel 718), at various speeds up to 213.5 m/min [700 surface feet per minute (SFPM)] has been investigated. In addition to slip, considerable twinning in the chips is observed at all speeds. Up to a cutting speed of about 30.5 m/min (100 SFPM), the chips formed are essentially continuous and ribbon-like, although deformation in the chip is inhomogeneous. At cutting speeds above 61 m/min (200 SFPM), shear-localized chips form. The longitudinal midsections of the chips show gross inhomogeneous deformation with shear localization between any two segments, and relatively low deformation within any individual segment. With an increase in speed the extent of contact between segments decreases rapidly, until a speed is reached where the individual segments become completely detached. The speed at which this occurs for other difficult-to-machine materials, such as AISI 4340, was found in an earlier study, to depend upon the metallurgical condition of the material and its hardness. Based on this study, the mechanism of chip formation when machining Inconel 718 is very similar to that reported earlier for machining both titanium alloys and hardened AISI 4340 steels at higher speeds. While the hcp crystal structure of titanium alloys in addition to titanium’s poor thermal properties (kρc) is believed to be partly responsible for the intense shear localization in that material, results with Inconel 718 (fcc) and AISI 4340 steel (bcc) indicate that the effect of structure on shear localization is not yet well understood.
    keyword(s): Nickel , Machining , Superalloys , Shear (Mechanics) , Iron , Deformation , Titanium alloys , Steel , Cutting , Twinning , Mechanisms , Thermal properties , Crystal structure AND Machinery ,
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      On Shear Instability in Machining a Nickel-Iron Base Superalloy

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    http://yetl.yabesh.ir/yetl1/handle/yetl/101392
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    contributor authorR. Komanduri
    contributor authorT. A. Schroeder
    date accessioned2017-05-08T23:22:57Z
    date available2017-05-08T23:22:57Z
    date copyrightMay, 1986
    date issued1986
    identifier issn1087-1357
    identifier otherJMSEFK-27718#93_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/101392
    description abstractThe deformation in chips produced in machining a nickel-iron base superalloy (Inconel 718), at various speeds up to 213.5 m/min [700 surface feet per minute (SFPM)] has been investigated. In addition to slip, considerable twinning in the chips is observed at all speeds. Up to a cutting speed of about 30.5 m/min (100 SFPM), the chips formed are essentially continuous and ribbon-like, although deformation in the chip is inhomogeneous. At cutting speeds above 61 m/min (200 SFPM), shear-localized chips form. The longitudinal midsections of the chips show gross inhomogeneous deformation with shear localization between any two segments, and relatively low deformation within any individual segment. With an increase in speed the extent of contact between segments decreases rapidly, until a speed is reached where the individual segments become completely detached. The speed at which this occurs for other difficult-to-machine materials, such as AISI 4340, was found in an earlier study, to depend upon the metallurgical condition of the material and its hardness. Based on this study, the mechanism of chip formation when machining Inconel 718 is very similar to that reported earlier for machining both titanium alloys and hardened AISI 4340 steels at higher speeds. While the hcp crystal structure of titanium alloys in addition to titanium’s poor thermal properties (kρc) is believed to be partly responsible for the intense shear localization in that material, results with Inconel 718 (fcc) and AISI 4340 steel (bcc) indicate that the effect of structure on shear localization is not yet well understood.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleOn Shear Instability in Machining a Nickel-Iron Base Superalloy
    typeJournal Paper
    journal volume108
    journal issue2
    journal titleJournal of Manufacturing Science and Engineering
    identifier doi10.1115/1.3187056
    journal fristpage93
    journal lastpage100
    identifier eissn1528-8935
    keywordsNickel
    keywordsMachining
    keywordsSuperalloys
    keywordsShear (Mechanics)
    keywordsIron
    keywordsDeformation
    keywordsTitanium alloys
    keywordsSteel
    keywordsCutting
    keywordsTwinning
    keywordsMechanisms
    keywordsThermal properties
    keywordsCrystal structure AND Machinery
    treeJournal of Manufacturing Science and Engineering:;1986:;volume( 108 ):;issue: 002
    contenttypeFulltext
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