长期热暴露过程对HR3C合金组织及显微硬度影响研究
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摘要
在650℃长期热暴露条件下,对经固溶处理及短时时效处理的HR3C合金的组织和显微硬度变化规律进行研究。结果表明,在650℃热暴露500 h,固溶态HR3C的晶粒尺寸有所减小,固溶态HR3C钢晶界上析出大量的M_(23)C_6相,呈连续分布,同时晶内析出更多细小的Z相。而短时时效态的HR3C在热暴露前后晶粒尺寸变化不大,晶界明显粗化,晶内有黑色析出相产生。同时,固溶态与短时时效态的HR3C在长期热暴露条件下显微硬度均提高15%左右,经短时时效处理的HR3C显微硬度值略高。
The changes of microstructure and microhardness of HR3C alloy after solid solution treatment and aging treatment were studied under the condition of long-term thermal exposure at 650 ℃. The results show that the microstructures and microhardness of HR3C steel are exposed at 650 ℃ for 500 h. The grain size of solid solution HR3C decreases, and a large number of M_(23)C_6 phases are precipitated on the grain boundary of HR3C steel with continuous distribution. At the same time, more small Z-phase is precipitated from inner-grain, however, HR3C in the short-aging state has little change in grain size before and after thermal exposure, the grain boundary is obviously coarsened, and the black phase is precipitated in the grain. At the same time, the microhardness of HR3C in both solid solution and short aging states is increased by about 15% under long-term thermal exposure conditions, the microhardness of HR3C is slightly higher with short-time aging treatment.
The changes of microstructure and microhardness of HR3C alloy after solid solution treatment and aging treatment were studied under the condition of long-term thermal exposure at 650 ℃. The results show that the microstructures and microhardness of HR3C steel are exposed at 650 ℃ for 500 h. The grain size of solid solution HR3C decreases, and a large number of M_(23)C_6 phases are precipitated on the grain boundary of HR3C steel with continuous distribution. At the same time, more small Z-phase is precipitated from inner-grain, however, HR3C in the short-aging state has little change in grain size before and after thermal exposure, the grain boundary is obviously coarsened, and the black phase is precipitated in the grain. At the same time, the microhardness of HR3C in both solid solution and short aging states is increased by about 15% under long-term thermal exposure conditions, the microhardness of HR3C is slightly higher with short-time aging treatment.
引文
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[2]马琳. 1 000 MW超超临界汽轮机关键技术探讨[J].中国科技信息, 2008, 24:101-103.
[3] Townsend R D. Materials for High Temperature Power Generation and Process Plant Applications[C], In:A.Strang, eds. IOM Communications, London, U.K, 2000:199-223.
[4]林富生,王治政,王宝忠,等.中国屯站用耐热钢及合金的研制、应用与发展[J].动力工程学报, 2010, 30(4):235-244.
[5] N. J. Zhang, F. Huang. Microstructure evolution and life assessment of T92 steel during long-term creep[J]. Journal of Alloys and Compounds, 2014,585(5):348-356.
[6]殷尊,郁有建,李国燕,等. 1Cr18Ni9钢的组织及性能与拉伸变形的关系[J].铸造技术, 2016, 37(8):1589-1590.
[7]李安娜.超超临界钢烟侧腐蚀研究[D].大连:大连理工大学, 2013.
[8]张冬梅.长期高温服役过程中化工Crl7Nil2Mo2耐热钢的组织及性能变化[J].铸造技术, 2017, 38(5):1025-1027.
[9] Y. Liu, C. Q. Cheng. Oxidation behavior of high-entropy alloys AlxCoCrFeNi(x=0.15, 0.4)insupercritical water and comparison with HR3C steel[J]. Transaction Nonferrous Metal Society China,2015(25):1341-1351.
[10]朱明.材料热处理原理及工艺[M].徐州:中国矿业大学出版社,2013.
[11] Z. Lu, R. G. Faulkner, G. Was, et al. Irradia tion-induced grain boundary chromium microchemistry in high alloy ferritic steels[J].Scripta Materialia, 2008, 58(10):878-881.