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Research on M_(23)C_6 precipitation of 690 alloy

机译：M_（23）C_6沉淀的690合金研究

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Precipitation M_(23)C_6 of 690 alloy was studied in this paper. Firstly, M_(23)C_6 precipitation and evolution of chromium-depleted zone of 690 alloy during TT were studied. Evolution of chromium-depleted zone of 690 alloy was affected markedly by TT. The test results showed that the lowest chromium concentration in chromium-depleted zone raised dramatically after TT for 10～20h because of chromium backfill. The morphology of M_(23)C_6 in 690 alloy specimens changed obviously during different TT temperatures of 650～850°C. 690 alloy could get good M_(23)C_6 morphology though TT at 700～725°C and there appeared coarse M_(23)C_6 presenting multiple layer morphology when TT temperature reached 750～850°C. When treated for TT different time at 715°C, the M_(23)C_6 amount increased with extension of TT time and M_(23)C_6 could precipitate adequately while the TT time reached 15h. Secondly, effect of carbon content of 690 alloy on the precipitation behavior of M_(23)C_6 was studied. Carbon content could affect precipitation of M_(23)C_6 in 690 alloy remarkably. The research results showed that the mass fraction of M_(23)C_6 in 690 alloy enhanced from 0.181% to 0.541% with increase of carbon content from 0.011% to 0.033% and good morphology of M_(23)C_6 could be gained when the carbon content was about 0.020%. For 690 alloy, the recommended TT process was 725±10°C×10～15h.
机译：本文研究了690合金的沉淀M_（23）C_6。首先，研究了TT期间690合金铬耗尽区的M_（23）C_6沉淀和演化。 TT的显着影响690合金的铬耗尽区的演变。试验结果表明，由于铬回填，铬耗尽区中的最低铬浓度在TT 10〜20h中显着升高。在690个合金标本中的M_（23）C_6在不同TT温度的不同TT温度下发生变化的M_（23）C_6变化。 690合金可以获得良好的M_（23）C_6形态，但TT在700〜725°C时，当TT温度达到750〜850°C时，呈现多层形态的粗m_（23）C_6。当在715℃处理TT不同时间时，M_（23）C_6量随TT时间的延伸而增加，M_（23）C_6可以充分沉淀，而TT时间达到15h。其次，研究了690合金碳含量对M_（23）C_6的沉淀行为的影响。碳含量可显着影响690合金中M_（23）C_6的沉淀。研究结果表明，690个合金中的M_（23）C_6的质量分数从0.181％增强，随着碳含量的增加，碳含量增加到0.011％至0.033％，并且在碳时可以获得M_（23）C_6的良好形态含量约为0.020％。对于690合金，推荐的TT工艺为725±10°C×10〜15h。

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