STP733

    Characterization of the Fracture Behavior of Fine-Grained High-Strength Low-Alloy (HSLA) Steels and Iron-Base Alloys Under Low-Temperature and Mechanical Environments

    Published: Jan 1981


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    Abstract

    This paper discusses the use of different fractographic techniques to characterize the fracture morphology of high-strength low-alloy (HSLA) steels with a variety of fine-grained microstructures and iron-base alloys strengthened by intermetallic precipitates in order to understand the various fracture mechanisms controlling their fracture resistance under low-temperature and mechanical environments. The fractographic techniques that have been used are conventional techniques, scanning electron fractography, sectioning techniques, and a newly developed chemical polishing method in conjunction with the Nomarski interphase contrast technique. The mechanical tests that have been used are tensile, notched-tensile, instrumented impact testing with precracked Charpy V-notch specimens, low-cycle fatigue, and high-cycle fatigue. A comprehensive characterization of the fracture morphology of the HSLA steels developed for arctic applications has resulted. Important features of the fracture (such as “splitting,” striations, ductile tearing, quasi-cleavage, microvoid coalescence, unit fracture path, persistent slip bands) have been identified and related to the mechanical behavior of the materials.

    Keywords:

    fractographic techniques, fractography, characterization, high-strength low-alloy (HSLA) steels, fracture mechanisms, materials, materials science


    Author Information:

    Krishnadev, MR
    Associate professor, Laval University, Quebec

    Cutler, LR
    Graduate students, Laval University, Quebec

    Sojka, GJ
    Graduate students, Laval University, Quebec

    Gauvin, P
    Students, Laval University, Quebec

    Hamel, G
    Students, Laval University, Quebec


    Paper ID: STP33442S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP33442S


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