Grain boundary structure effects on cold work embrittlement of microalloyed steels

Journal Article · Fri Jul 03 04:00:00 EDT 1998 · Scripta Materialia

DOI:https://doi.org/10.1016/S1359-6462(98)00172-9· OSTI ID:634759

Lehockey, E M; Palumbo, G; Lin, P ^[1]

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1. Ontario Hydro Technologies, Toronto, Ontario (Canada)

Microalloyed steels (e.g., SAE 1005) used in deep drawing applications can often be susceptible to cold work embrittlement. Although cracks can propagate both intergranularly and transgranularly, initiation is believed to occur intergranularly. Grain boundaries having misorientations described by low-{Sigma} values in the Coincident Site Lattice (CSL) framework are recognized to exhibit increased resistance to sliding, cavitation, and cracking. Increasing the frequency of low-{Sigma}, special grain boundaries has been demonstrated to significantly enhance ductility and toughness in a wide variety of pure metals and alloys. Reduced susceptibility to these intergranular degradation processes arise from the increased structural order expected of low-{Sigma} CSL interfaces and possible reduced interaction with harmful impurities. The intention of the present work is to evaluate the effect of low-{Sigma} CSL boundaries on the nucleation and propagation of cracks during deep-draw forming operations in ultra-low carbon microalloyed steels.

• OSTI ID: 634759
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 3 Vol. 39; ISSN 1359-6462; ISSN SCMAF7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COLD WORKING
CORRELATIONS
CRACK PROPAGATION
CRACKS
EMBRITTLEMENT
GRAIN BOUNDARIES
GRAIN ORIENTATION
NUCLEATION
STEELS