CAJ | 학술논문

由于ZG1Cr10MoWVNbN耐热钢在长期高温环境下工作,其长期高温时效性能将变得非常重要. 采用600℃下保温17 000 h的长期时效热处理工艺,并对时效前后碳化物显微组织性能变化及析出物对力学性能的影响进行了研究.结果表明,600℃长期时效后,马氏体板条变宽、板条间的界面变得模糊;时效前后,ZG1Cr10MoWVNbN钢的力学性能有不同程度的下降,其中塑性指标和冲击功下降较大;时效后,在马氏体板条内析出的NbC碳化物颗粒尺寸仍保持细小,是主要的高温强化相,使钢保持良好的高温性能,可减少合金高温性能的衰退,析出相M23 C6 碳化物,明显长大,导致马氏体组织出现劣化,强度降低.
유우ZG1Cr10MoWVNbN내열강재장기고온배경하공작,기장기고온시효성능장변득비상중요. 채용600℃하보온17 000 h적장기시효열처리공예,병대시효전후탄화물현미조직성능변화급석출물대역학성능적영향진행료연구.결과표명,600℃장기시효후,마씨체판조변관、판조간적계면변득모호;시효전후,ZG1Cr10MoWVNbN강적역학성능유불동정도적하강,기중소성지표화충격공하강교대;시효후,재마씨체판조내석출적NbC탄화물과립척촌잉보지세소,시주요적고온강화상,사강보지량호적고온성능,가감소합금고온성능적쇠퇴,석출상M23 C6 탄화물,명현장대,도치마씨체조직출현열화,강도강저.
Because ZG1Cr10MoWVNbN heat-resistant steel works under high temperature for a long term, its long-term high temperature aging performance is very important. After a test on a sample of long-term aging heat treat-ment process under 600℃ for 17 000 hours, the carbide microstructure′s change in performance before and after the aging test were compared, along with the influence of precipitates on mechanical properties. The results show that after the 600℃ long-term aging process, the martensite lath becomes wider, the interface between laths becomes blurred;before and after the aging, the ZG1Cr10MoWVNbN steel′s mechanical properties decrease to a varying ex-tent, among which the plastic index and the impact power is reduced more obviously;after the aging, the sizes of NbC carbide granules precipitated are still small, manifesting the main phase after reinforcement under high tem-perature, it is beneficial to keeping steel′s better performance under high temperature, reducing the performance decaying of alloy under high temperature, the precipitated M23 C6 carbide becomes coarsened obviously, which leads to worsening of martensite and reducing in strength.