日本金属学会誌

J. Japan Inst. Metals, Vol. 76, No. 12 (2012),
pp. 669-676

Plastic Strain Dependency of Misorientation for Austenitic Stainless Steel and Nickel Base Alloy

Yohei Sakakibara, Kyohei Nomura, Keiji Kubushiro and Hiroki Yoshizawa

Research laboratory, Corporate Research & Development, IHI Corporation, Yokohama 235-8501

Abstract:

Misorientation in austenitic stainless steels (Type316NG, Type304NG, KASUS304J1HTB) and nickel base alloy (Alloy690TT) was measured by Electron back scatter diffraction (EBSD). Kernel Average Misoirientation (KAM) values were calculated for each material and their calculated pitch dependency were consistent with the theory in the range of smaller plastic strain and the shorter calculated pitch. However, constant β, which is plastic strain and measured pitch dependency in KAM values for Alloy690TT was lower than those for austenitic stainless steels. For the misorientation gradient scatters in austenitic stainless steels, on the other hand, the gradient doesn't scatter in Alloy690TT. It suggests that continuous precipitates on grain boundary in Alloy690TT make grains uniformly when plastic strain was applied. Grain Orientation Spread (GOS) that is one of calculation methods of EBSD was also calculated and the plastic strain dependency was confirmed. Constant β derived from the dependency of GOS shows the approximately same values in austenitic stainless steels and Alloy690TT.


(Received 2012/9/11)

Keywords:

austenitic stainless steel, nickel base alloy, electron back scatter diffraction, plastic strain, grain size, kernel average disorientation, grain orientation spread


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