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INTRAGRANULAR VC AND M_(23)C_6 IN GH36 SUPERALLOY

LI Yuqing Research Institute of Daye Steel Works , Huangshi , China Senior Engineer , Research Institute of Daye Steel Works , Huangshi , Hubei Province 435001 , China

金属学报(英文版)

The distinct images of intragranular VC were observed on TEM in superalloy GH36 underwent normal heat treatment and prolonged aging.The size of VC particles were meas- ured by means of Moire pattern,and the misfit between VC and austenite was also calculated. The M23C6 enveloped in VC shell was also observed in the prolonged-aged specimens.The coherent relation between intragranular M_(23)C_6 twins and austenite as well as its coherent in- terface were also studied.

关键词: VC , null , null , null

METHOD FOR POLYFAMILY PLANE TRACE ANALYSIS AND ITS APPLICATION

LI Yuqing Research Institute of Daye Steel Works , Huangshi , China Senior Engineer , Research Institute of Daye Steel Works , Huangshi 435001 , China

金属学报(英文版)

The formula for calculating included angle between polufamily plane traces of lattice systems in thin foit under hath zero tilt and non-zero tilt states was deduced and verified by certain prat tical examples.The method may be available to index the plane traces of slip.twin and other defects.especially to determine such planar defects as twin and other defects esperially

关键词: polyfamily plane , null , null , null

ON THE M_7C_3 IN Cr27 CAST IRON

LI Yuqing WANG Cirong GU Zhaofeng Research Institute of Daye Steel Works , Huangshi , China Senior Engineer , Research Institute of Daye Steel Works , Huangshi 435001 , China

金属学报(英文版)

Determination of(Fe,Cr)_7C_3 in Cr27 cast iron results about 30 v.-%.Minor Si and Mn are present.Sectional area of the M_7C_3 grains is 1—50μm~2.Combining matrix analysis of elec- tron diffraction pattern with calculated angle between plane traces,{011}twins and also {013}twins producing local environment for Ru_7B_3 are observed in the orthorhombic M_7C_3. A crystallographic model for M_7C_3 is proposed.

关键词: cast iron , null , null , null , null

EFFECT OF Nb ON STRENGTHENING OF Fe-BASE SUPERALLOY AT INTERMEDIATE HIGH TEMPERATURES

CHEN Guosheng WU Bohua ZHOU Lecheng LI Yuqing Research Institute of Daye Steel Works , Huangshi , China Engineer , Research Institute of Daye Steel Works , Huangshi 435001 , China

金属学报(英文版)

Because Nb accelerates the uniform distribution of MC phase and the grain refinement,as well as,increases the amount and stability of γ-phase,the tensile strength,ductility,stress rupture life and fatigue limit of Fe-30Ni-13Cr-1.2W-1.5Mo-2.5Ti-0.4AI superalloy at 650℃ can be improved with increase of Nb content up to 1.22 wt-%.The precipitation of small Laves phase particles dispersed along grain boundaries may be favourable to combined properties of the superalloy containing 1.22 wt-% Nb.It will be worsened only that the pre- cipitation of Laves phase particles'dispersed along grain boundaries may be favourable for combined properties of the superalloy containing 1.22 wt-% Nb.It will be worsened only that the precipitation of Laves phase is too more because of too high Nb content existhing.

关键词: Nb , null , null

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