Distribution of Mo at Grain Boundary of 1300MPa CrMo Steel

W.G. Yang; L.N. Zhang; X. Zhang; W.J. Hui

doi:10.4028/www.scientific.net/MSF.475-479.109

Paper Titles

Microstructures and Properties of a Bainite and Martensite Dual-Phase Cast Steel Fabricated by Combination of Alloying and Controlled Cooling Heat Treatment
p.93

Strengthening and Toughening Mechanisms of the Microalloying Non-Quenching and Tempering Steel
p.97

TEM Observation on Nano-Precipitation of Plain Low Carbon Steel by CSP
p.101

Strain-Induced Precipitation of Nb(CN) during Deformation of Undercooled Austenite in Nb-Microalloyed HSLA Steels
p.105

Distribution of Mo at Grain Boundary of 1300MPa CrMo Steel
p.109

The Mechanism of Intragranular Ferrite Nucleation on Inclusion in Steel
p.113

Subsurface Microstructure Evolution of Hadfield Steel under High Impact Energy
p.117

Evolution of Microstructures in a Low Carbon Bainitic Steel during Reheating
p.121

Dislocation-Precipitate Interaction and Its Effect on Thermostability of Bainite in a Nb-Bearing Steel
p.125

HomeMaterials Science ForumMaterials Science Forum Vols. 475-479Distribution of Mo at Grain Boundary of 1300MPa...

Distribution of Mo at Grain Boundary of 1300MPa CrMo Steel

Abstract:

TEM, EDS and STEM were used to investigate distribution of Mo element in new CrMo steel ADF1 which is applied to 1300MPa high strength bolts with superior delayed fracture resistance. Research results reveal that Mo easily concentrates at grain boundaries. According to refined EDS point and mapping analysis, the region of Mo segregation at grain boundary is about several nanometers wide, and distribution of Mo along the grain boundary is not uniform. The average content of Mo at grain boundary is about double of that in grain area. Concentration of Mo can increase the bonding force of grain boundary, and this is of advantage to the improvement of strength and delayed fracture resistance of the new CrMo steel.