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Change in dislocation configuration of deformed Fe-Ni-Nb-Ti-C-B alloy during stress relaxation

Journal of university of science and technology beijing 2003年第3期10卷 76-78页

作者： shaoqiang yuan, shanwu yang, wenjin nie, and xinlai he department of materials physics, university of science and technology beijing, beijing 100083, china Tangshan College, Tangshan 063000, china Dept. of Mat. Phys. Univ. of Sci. and Technol. Beijing Beijing 100083 China Tangshan Coll. Tangshan 063000 China

Transmission electron microscopy (TEM) was applied to investigate theevolution of dislocation configuration and strain induced precipitation behavior during relaxationprocess after deformation in Fe-Ni-Nb-Ti-C-B alloy. Experimental results indicate that thedislocation density is very high and distribute randornly before relaxation. As the relaxation timeincreasing, dislocation cells will form gradually by polygonization. The strain inducedprecipitation retards the progress. In the final relaxation stage, most dislocations get rid ofpinning of precipitates and the cells have developed into subgrains with large size.

关键词： relaxation dislocation cell strain induced precipitation

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Dissolving of Nb and Ti Carbonitride Precipitates in Microalloyed Steels

Dissolving of Nb and Ti Carbonitride Precipitates in Microal...

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第二届先进钢铁结构材料国际会议

作者： yang shanwu~1, yuan shaoqiang~2, nie wenjin~1, he xinlai~1 (1.School of materials science and Engineering, university of science and technology beijing, beijing 100083, china 2. Tangshan College, hebei 063000, china)

＜正＞Transmission electron microscopy （TEM） and energy dispersion x-ray spectrum （EDX） have been carried out to investigate dissolving behaviour of Nb and Ti carbonitride precipitates in microalloyed steels during isothermal holding at 1300℃. It has been found that all precipitates in Nb-Ti microalloyed steel were （Nb, Ti）（C, N）. With holding time increasing, the atomic ratio of Nb/Ti in precipitates decreased gradually. These precipitates still existed even after holding for 48h at 1300℃while Nb（C, N） precipitates dissolved away in Nb microalloyed steel only after 4h at the same temperature. These results shows that formation and thermostability of precipitates are considerably influenced by interaction between Nb and Ti.

关键词： Dissolving (Nb Ti)(C N) TEM-EDX

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