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eutectoid n.【化、冶】類低共熔體,共析。adj.類低共熔體的,共...

euterpe

According to the nb - si phase diagram , the temperature of 1550 ? , which is lower than the eutectoid transformation temperature of nbssi ( 1783 ? ) , is chosen for heat - treatment . according to the present conditions of the furfaces , heat - treatment by stages is first proposed for the nb - si system intermetallic composites to keep the furface in good conditions . the results indicate that the equilibrium nb + nbssia dual - phase microstructure of the nb - si system intermetallics forms gradually via such eutectoid reaction as nbasi ? nb + nbssis with the heat - treatment time 根據nb - si二元相圖,選擇略低于nb _ 3si共析轉變溫度t _ f = 1783的1550對鑄態nb - si系金屬間化合物進行不同時間( 25h - 100h )的熱處理,并根據目前國內和我院熱處理爐的現狀,首次提出采用分段熱處理的方法來解決nb - si合金熱處理溫度高、連續熱處理時間過長而影響熱處理爐壽命的困難。

It is indicated that the improved model can calculate the fraction of ferrite and pearlite more accurately , and can specially reflect the effect of both undercooling during the eutectoid transformation and the amount of graphite nodules formed during the process of eutectic reaction on the fraction of pearlite 結果表明,改進的模型可以更準確地預測球鐵中鐵素體和珠光體的數量,能夠準確地體現共析階段過冷情況和共晶球墨數對珠光體數量的影響。

Based on the analysis of eutectoid transformation of sg ( spheroidal graphite ) iron , the numerical model of formation of ferrite and pearlite during the eutectoid transformation was improved 摘要通過對球墨鑄鐵件共析轉變的分析,改進了球鐵件中鐵素體與珠光體形成的數學模型。

The eutectoid reactions which can occur are extremely sluggish . 可能發生的共折反應是非常緩慢的。

The eutectoid compounds are very slow in forming . 共析物的形成是非常緩慢的。