Mechanical Behavior of Ultrafine Gradient Grain Structures Produced via Ambient and Cryogenic Surface Mechanical Attrition Treatment in Iron

Metals

Heather A. Murdoch¹  Kristopher A. Darling²  Anthony J. Roberts²  Laszlo Kecskes² 

[1] U.S. Army Research Laboratory, Weapons and Materials Directorate, Aberdeen Proving Ground, MD 21005-5069, USA;

关键词: grain size gradient;    surface mechanical attrition treatment;    cryogenic;    ultrafine-grained;   

DOI  :  10.3390/met5020976

来源: mdpi

【 摘 要 】

Ambient and cryogenic surface mechanical attrition treatments (SMAT) are applied to bcc iron plate. Both processes result in significant surface grain refinement down to the ultrafine-grained regime; the cryogenic treatment results in a 45% greater grain size reduction. However, the refined region is shallower in the cryogenic SMAT process. The tensile ductility of the grain size gradient remains low (<10%), in line with the expected behavior of the refined surface grains. Good tensile ductility in a grain size gradient requires the continuation of the gradient into an undeformed region.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.