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脱碳Fe-Ni合金的实验表明:当奥氏体母相的晶粒度保持一定,淬火温度在900℃以上时,随淬火温度的升高,M_s降低,母相强度提高;将高温淬火的母相进行短时间退火,M_s上升,母相强度下降。提出了淬火空位和相变不全位错交互作用的模型,认为空位集团阻碍了马氏体的形核。淬火母相的TEM观察初步肯定了上述结论。导出空位的形成能为1.2—1.4eV,与已知数据符合;退火过程的激活能为0.18eV,与双空位分解能量相当。考虑到淬火应力的影响,本实验中用2500℃/s冷却速度淬火,适合于研究淬火空位对M_s的影响。
The decarburization Fe-Ni alloy experiment shows that when the grain size of the austenite parent phase is kept constant and the quenching temperature is above 900 ℃, the M_s decreases and the matrix strength increases with the increase of the quenching temperature. The parent phase anneals for a short time, M_s increases, and the strength of the parent phase decreases. A model of interaction between quenching vacancies and imperfect dislocations was proposed. It is believed that the vacant group hindered the nucleation of martensite. TEM observation of the quenched mother phase initially confirmed the above conclusion. The formation of vacancies can be 1.2-1.4 eV, which is consistent with the known data. The activation energy of the annealing process is 0.18 eV, which is equivalent to the energy of double vacancy decomposition. Taking into account the impact of quenching stress, the experiment with 2500 ℃ / s cooling rate quenching, suitable for studying the influence of quenching vacancies on M_s.