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采用内耗方法分析了高锰奥氏体合金钢在720℃时效不同时间MC型碳化物析出动力学过程。结果表明,随着时效时间增加,其在652 K左右出现的FR内耗峰强逐渐降低且峰宽变窄。证明了时效过程固溶于奥氏体间隙中的C发生了重新分配,碳化物不断析出导致基体合金含量降低。基于720℃时效不同时间FR内耗峰峰强变化,并结合JMA方程证明了在720℃时效过程中,间隙C原子与奥氏体基体中固溶合金原子形成的碳化物以缺陷为核心形核长大。基于内耗分析结果,通过理论计算分析奥氏体合金钢中碳化物(MC型)时效析出过程,可见通过FR峰峰强变化可分析高锰奥氏体合金钢中碳化物析出动力学。
The internal friction method was used to analyze the kinetics of MC carbides precipitation in high manganese austenitic alloy steel at 720 ℃ for different time. The results show that with the increase of aging time, the peak frictional intensity at FR around 652 K gradually decreases and the peak width narrows. It is proved that the C dissolved in the austenite gap during the aging process is redistributed, and the carbides continuously precipitate and the matrix alloy content decreases. Based on the change of the peak-to-peak energy dissipation in the FR at 720 ℃ for different time and the JMA equation, it is proved that the carbide formed by the interstitial C atoms and the solid solution alloy atoms in the austenite matrix takes the defect as the core nucleation length Big. Based on the results of internal friction analysis, the time-dependent precipitation of carbides (MC type) in austenitic alloy steel was theoretically calculated. It can be seen that the precipitation kinetics of carbides in high-manganese austenitic alloy steel can be analyzed by the change of FR peak-to-