Fundamental studies on stress-corrosion cracking in iron and underlying mechanisms

abstract

• Stress-corrosion cracking (SCC) in Fe and Fe-based alloys is critical to material failure for many applications of these materials. In this paper, the behavior of the Fe 3 (1 1 1) grain boundary (GB) is studied under precipitations of S, P, N, C and B to elucidate the effects caused by stress-corrosion, as well as its mechanisms, using first-principles calculations. There are certain locations where impurities tend to segregate more. Some elements, such as C and B, serve as strengtheners, while S, P and N weaken the Fe-Fe interactions at GBs. However, the stress-corrosion failures arise in a variety of ways. The accumulation of S and P results in separation of grains, which in turn gives rise to the intergranular cracking under sufficient stress. Cavities may grow at GBs due to the segregation of N and formation of nitrides; consequently, SCC could propagate through the connection of voids. 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

authors

• Cagin, Tahir

published proceedings

• ACTA MATERIALIA

author list (cited authors)

• Pham, H. H., & Cagin, T.

citation count

• 14

complete list of authors

• Pham, Hieu H||Cagin, Tahir

publication date

• September 2010

publisher

• Elsevier  Publisher

published in

• ACTA MATERIALIA  Journal

keywords

• Density Functional Theory
• Grain Boundary Embrittlement
• Grain Boundary Segregation
• Iron
• Stress-corrosion Cracking

Digital Object Identifier (DOI)

• 10.1016/j.actamat.2010.05.050

start page

• 5142

end page

• 5149

volume

• 58

issue

• 15

URL

• http%3A%2F%2Fdx.doi.org%2F10.1016%2Fj.actamat.2010.05.050