TY - GEN
T1 - Microstructure evolution and tensile properties of 304l stainless steel subjected to surface mechanical attrition treatment
AU - Jiang, Ping
AU - Lu, Jian
AU - Wu, Xiao Lei
PY - 2011
Y1 - 2011
N2 - A gradient nanostructured layer (GNsL) was generated on the two sides of bulk sample in 304L stainless steel by means of the surface mechanical attrition treatment. The microstructure of the GNsL was characterized via TEM observation. The prominent microstructural features involve the intersection of multi-system twin operation, subdividing the original grains into blocks, a martensite transformation mainly occurring at the interface of the twins as well, and the randomly orientated nanocrystallites at the top of surface. After annealing at 750°C for 10 min, recovery had occurred and the dislocation density was much reduced. The vast majority of the grains at the top surface were in the nanocrystalline/ultrafine range, with some recrystallization regions. The uniaxial tensile tests were performed to obtain the mechanical property of bulk samples with GNsL. The yield strength was about 2 times higher than that of the coarse-grained counterpart, but with a decrease in uniform elongation and elongation to failure as well. The relationship between the microstructure and mechanical property was discussed in detail.
AB - A gradient nanostructured layer (GNsL) was generated on the two sides of bulk sample in 304L stainless steel by means of the surface mechanical attrition treatment. The microstructure of the GNsL was characterized via TEM observation. The prominent microstructural features involve the intersection of multi-system twin operation, subdividing the original grains into blocks, a martensite transformation mainly occurring at the interface of the twins as well, and the randomly orientated nanocrystallites at the top of surface. After annealing at 750°C for 10 min, recovery had occurred and the dislocation density was much reduced. The vast majority of the grains at the top surface were in the nanocrystalline/ultrafine range, with some recrystallization regions. The uniaxial tensile tests were performed to obtain the mechanical property of bulk samples with GNsL. The yield strength was about 2 times higher than that of the coarse-grained counterpart, but with a decrease in uniform elongation and elongation to failure as well. The relationship between the microstructure and mechanical property was discussed in detail.
KW - 304L stainless steel
KW - Gradient nanostructured layer
KW - Mechanical properties
KW - Mechanical twinning
KW - Surface mechanical attrition treatment
UR - https://www.scopus.com/pages/publications/79951839478
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-79951839478&origin=recordpage
U2 - 10.4028/www.scientific.net/MSF.667-669.175
DO - 10.4028/www.scientific.net/MSF.667-669.175
M3 - RGC 32 - Refereed conference paper (with host publication)
SN - 9783037850077
VL - 667-669
T3 - Materials Science Forum
SP - 175
EP - 179
BT - Nanomaterials by Severe Plastic Deformation, NanoSPD5
T2 - 5th International Conference on Nanomaterials by Severe Plastic Deformation, NanoSPD5
Y2 - 21 March 2011 through 25 March 2011
ER -