You are being redirected because this document is part of your ASTM Compass® subscription.
    This document is part of your ASTM Compass® subscription.

    If you are an ASTM Compass Subscriber and this document is part of your subscription, you can access it for free at ASTM Compass
    Volume 4, Issue 2 (February 2015)

    Special Issue Paper

    Microstructurally Mediated Changes in Fracture Characteristics for Electrochemically Hydrogenated 4340 Steel

    (Received 18 February 2014; accepted 26 June 2014)

    Published Online: 28 February 2015

    CODEN: MPCACD

      Format Pages Price  
    PDF (3.8M) 16 $25   ADD TO CART

    Cite this document

    X Add email address send
    X
      .RIS For RefWorks, EndNote, ProCite, Reference Manager, Zoteo, and many others.   .DOCX For Microsoft Word



    Abstract

    The effect of hydrogen on the fracture characteristics of low alloy 4340 steel was studied using double-notched tensile samples electrochemically charged in situ with hydrogen in 1 N H2SO4 + 5 mg/l As2O3 solution. Fracture behaviors of samples with prior austenitic grain sizes of 10 and 40 μm and martensitic hardness of 43–52 HRC (Rockwell hardness, C scale) were examined after hydrogen charging times of 0–40 min. As expected, increases in hydrogen charging time and hardness resulted in decreased failure strains and decreased evidence of ductile fracture. Harder samples showed predominant intergranular fracture close to the notch and a combination of ductile and flat surfaces away from the notch. Softer samples showed mixed mode intergranular and quasi-cleavage fracture close to the notch and predominant ductile fracture as distance from the notch increased.


    Author Information:

    Hassan, Mobbassar Sk
    National Center of Excellence for Research in the Intermodal Transport Environment, Materials Engineering, Auburn Univ., Auburn, AL

    Overfelt, Ruel A.
    National Center of Excellence for Research in the Intermodal Transport Environment, Materials Engineering, Auburn Univ., Auburn, AL


    Stock #: MPC20140026

    ISSN:2165-3992

    DOI: 10.1520/MPC20140026

    Author
    Title Microstructurally Mediated Changes in Fracture Characteristics for Electrochemically Hydrogenated 4340 Steel
    Symposium ,
    Committee E08