CAJ | 학술논문

为了给冶炼成分设计、热加工工艺和热处理制度提供理论依据，利用扫描电镜(SEM)和热力学计算软件Thermo-Calc 对028合金中析出相的特征进行观察和元素含量变化对其影响进行计算分析，并给出主要元素的合理控制范围。结果表明：不同状态的028合金晶内和晶界会析出σ相，720℃时效1000 h后会析出大量针状σ相；028合金的主要平衡相为γ、M23C6、σ和α-Cr相；碳含量的增加可以显著地提高M23C6的析出量和析出温度，碳含量应控制在0.02%(质量分数)以内；随着Cr和Mo 含量的增加，σ相的析出量增多，析出温度升高，由于σ相是有害相，Cr和Mo的含量需分别控制在26.5%和3.5%以内；初始Cr和Mo含量增加，基体γ相固溶的Cr和Mo含量也增加，初始Cr和Mo含量应分别控制在26.5%~27.5%和3.0%~4.0%之间。
위료급야련성분설계、열가공공예화열처리제도제공이론의거，이용소묘전경(SEM)화열역학계산연건Thermo-Calc 대028합금중석출상적특정진행관찰화원소함량변화대기영향진행계산분석，병급출주요원소적합리공제범위。결과표명：불동상태적028합금정내화정계회석출σ상，720℃시효1000 h후회석출대량침상σ상；028합금적주요평형상위γ、M23C6、σ화α-Cr상；탄함량적증가가이현저지제고M23C6적석출량화석출온도，탄함량응공제재0.02%(질량분수)이내；수착Cr화Mo 함량적증가，σ상적석출량증다，석출온도승고，유우σ상시유해상，Cr화Mo적함량수분별공제재26.5%화3.5%이내；초시Cr화Mo함량증가，기체γ상고용적Cr화Mo함량야증가，초시Cr화Mo함량응분별공제재26.5%~27.5%화3.0%~4.0%지간。
In order to provide theoretical guidance for smelting component design, hot working and heat treatment, precipitated phases in 028 alloy were observed by scanning electron microscopy (SEM) and the effects of element contents on them were studied by Thermo-Calc software, and the reasonable control ranges of the main elements were given. The results show thatσphase precipitates at intragranular and grain boundaries of 028 alloy in different states, a lot of spiculateσphase precipitates after aging at 720℃for 1 000 h?the main equilibrium precipitated phases of 028 alloy include γ, M23C6, σ and α-Cr phases, the increase in carbon content can significantly improve the precipitation amount and precipitation temperature of M23C6, the carbon content should be controlled within 0.02%(mass fraction)?with the increase of Cr and Mo contents, the precipitation amount and precipitation temperature of σ phase increase, because theσphase is harmful phase, Cr and Mo contents should be controlled within 26.5% and 3.5%, respectively?with the initial Cr and Mo content increasing, Cr and Mo contents solid-soluted in the matrixγphase increase, and the initial Cr and Mo contents should be controlled between 26.5%-27.5%and 3.0%-4.0%, respectively.