Analysis of Creep Failure of T91-HR3C Dissimilar Steel Joint
-
摘要: 对T91-HR3C异种钢高温蒸汽管道接头的服役过程进行了数值仿真研究，在ANSYS软件内自定义了母材和焊缝区域的蠕变本构模型，分析了服役过程母材热影响区、焊缝融合线及焊缝的温度、应力及应变变化规律，确定了焊接接头在服役过程中的危险点，描述了焊接接头服役过程中的变形。结果表明T91-HR3C异种钢焊接接头在高温长时间服役过程中，应力集中发生在焊缝融合区，并且随时间推移应力集中从HR3C-焊缝界面逐渐转移至T91-焊缝界面，出现应力松弛现象，认为焊缝区域性能劣化是影响其蠕变寿命的关键所在。Abstract: The service process of T91-HR3C dissimilar steel joint in the high temperature steam pipe is studied by using numerical simulation. The creep constitutive models for the base metal and the welded area are defined in ANSYS software. The variation law of temperature, stress and strain of the base metal, heat affected area, weld fusion line and weld in the service process are analyzed separately. The dangerous points of weld joint in the service process are determined. The joint deformation in the service process is also described. The results show that the stress concentration of T91-HR3C dissimilar steel joint occurs in the weld fusion area in the long-term service under high temperature, and then shifts gradually from the HR3C weld interface to the T91 weld interface over time, and finally the stress relaxation phenomenon occurs. It is considered that the performance degradation of the heat affected zone in the weld area is the key to affect its creep life.
-
表 1 蒸汽与烟气的物理性质
参数名称及单位 数值 蒸汽压力/MPa 26 蒸汽温度/℃ 603 烟气温度/℃ 750 蒸汽对流换热系数/(W·m-2·℃-1) 2 053.65 烟气对流换热系数/(W·m-2·℃-1) 123.51 
下载: 导出CSV
表 2 母材金属和焊丝的化学成分
名称 w(C) w(Si) w(Mn) w(S) w(P) w(Cr) w(Mo) w(V) w(Nb) w(Ni) w(Al) w(N) HR3C 0.06 0.40 1.2 25.0 0.45 20.0 0.2 T91 0.10 0.40 0.46 0.01 0.01 8.85 0.93 0.21 0.09 0.01 0.003 0.038 ERNiCr-3 0.04 0.04 2.8 0.01 0.01 20.0 0.48 0.21 2.5 72.6
下载: 导出CSV
表 3 T91的材料性能参数
参数名称及单位 20 ℃ 100 ℃ 200 ℃ 300 ℃ 400 ℃ 500 ℃ 600 ℃ 700 ℃ 比热容c/(J·(kg·K)-1) 460 469 490 511 530 540 800 热导率λ/(W·(m·K)-1) 26.0 27.0 28.0 29.2 29.1 29.0 29.3 29.0 线膨胀系数α/10-6℃-1 10.6 10.9 11.3 11.7 11.9 12.2 12.4 12.6 弹性模量E/103MPa 218 213 207 199 190 181 168 158 切变模量G/103MPa 85.0 79.0 75.7 70.9 65.4 58.6 屈服应力/MPa 691 517 482 477 447 414 326 161 泊松比 0.29 0.30 0.29 0.30 0.29 0.30 0.29 0.35 蠕变系数a 2.51×10-28 蠕变指数n 9.1
下载: 导出CSV
表 4 HR3C的材料性能参数
参数名称及单位 20 ℃ 100 ℃ 200 ℃ 300 ℃ 400 ℃ 500 ℃ 600 ℃ 700 ℃ 比热容c/(J·(kg·℃)-1) - 506.5 528.6 553.9 565.6 488.6 336.8 396.2 热导率λ/(W·(m·K)-1) - 15.87 17.40 19.70 20.78 18.59 13.24 15.68 线膨胀系数α/10-6℃-1 - 17.04 16.96 18.19 18.84 19.41 19.71 19.81 弹性模量E/103MPa 201 196 188 179 169 162 155 147 切变模量G/103MPa 76.9 74.6 71.2 67.9 62.4 59.6 57.2 54.7 屈服应力/MPa 480 泊松比 0.3 0.31 0.32 0.32 0.35 0.35 0.35 0.34 蠕变系数a 2.6×10-29 蠕变指数n 8.1
下载: 导出CSV
表 5 600 ℃下ERNiCr-3的材料性能参数
参数名称及单位 数值 弹性模量E/MPa 190×103 屈服应力/MPa 478 泊松比 0.3 蠕变系数a 7.9×10-30 蠕变指数n 8.2
下载: 导出CSV
-
[1] 郝建江. 浅析预防电厂锅炉四管泄漏的措施[J]. 科技创新导报, 2015, 12(22): 151-152 doi: 10.3969/j.issn.1674-098X.2015.22.067HAO J J. Analysis on the measures to prevent the leakage of four tubes in power plant boiler[J]. Science and Technology Innovation Herald, 2015, 12(22): 151-152 (in Chinese) doi: 10.3969/j.issn.1674-098X.2015.22.067 [2] 李戈, 朱海宝, 陈卓婷. 600MW超临界机组T91屏式过热器管爆管的失效分析与防治[J]. 热加工工艺, 2018, 47(20): 257-260 https://www.cnki.com.cn/Article/CJFDTOTAL-SJGY201820069.htmLI G, ZHU H B, CHEN Z T. Failure analysis and prevention on tube bursting of T91 plate superheater of 600MW supercritical unit[J]. Hot Working Technology, 2018, 47(20): 257-260 (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-SJGY201820069.htm [3] 张艳飞, 田力男, 田峰, 等. 主蒸汽管道异种钢焊缝断裂失效分析[J]. 焊接技术, 2014, 43(6): 61-63, 67 https://www.cnki.com.cn/Article/CJFDTOTAL-HSJJ201406018.htmZHANG Y F, TIAN L N, TIAN F, et al. Fracture failure analysis of dissimilar steel welds in main steam pipeline[J]. Welding Technology, 2014, 43(6): 61-63, 67 (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-HSJJ201406018.htm [4] 赵加星, 潘晴川, 刘翔. 锅炉管道三通焊缝裂纹分析及预防研究[J]. 管道技术与设备, 2018(2): 40-44 doi: 10.3969/j.issn.1004-9614.2018.02.012ZHAO J X, PAN Q C, LIU X. Crack analysis of three way weld seam in boiler pipe and study of prevention[J]. Pipeline Technique and Equipment, 2018(2): 40-44 (in Chinese) doi: 10.3969/j.issn.1004-9614.2018.02.012 [5] 郭恒超, 纪冬梅, 戴晨, 等. 氧化膜的层数和成分对T22炉管温度场和应力场的影响研究[J]. 电站系统工程, 2018, 34(4): 1-5 https://www.cnki.com.cn/Article/CJFDTOTAL-DZXT201804001.htmGUO H C, JI D M, DAI C, et al. Influence of layer number and composition of oxide scale on temperature & stress field ofT22 tube[J]. Power System Engineering, 2018, 34(4): 1-5 (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-DZXT201804001.htm [6] 涂善东. 高温结构完整性原理[M]. 北京: 科学出版社, 2003: 11TU S D. High temperature structural integrity[M]. Beijing: Science Press, 2003: 11 (in Chinese) [7] BRUTTI C, GAUZZI F, MISSORI S. Thermal fatigue behaviour of dissimilar-metal welds[M]. RIE K T. Low Cycle Fatigue and Elasto-Plastic Behaviour of Materials. Dordrecht: Springer, 1987: 432-437 [8] 金彦, 顾福明, 叶上云, 等. T92/HR3C异种钢焊接接头蠕变断裂研究[J]. 锅炉技术, 2010, 41(3): 45-48 https://www.cnki.com.cn/Article/CJFDTOTAL-GLJS201003012.htmJIN Y, GU F M, YE S Y, et al. Research on T92/HR3C dissimilar metal welded joint of creep fracture[J]. Boiler Technology, 2010, 41(3): 45-48 (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-GLJS201003012.htm [9] 姚兵印, 李太江, 刘福广, 等. HR3C/T91异种耐热钢焊接接头的力学性能及界面蠕变失效行为研究[J]. 中国电机工程学报, 2011, 31(11): 92-98 https://www.cnki.com.cn/Article/CJFDTOTAL-ZGDC201111015.htmYAO B Y, LI T J, LIU F G, et al. Mechanical properties and interfacical creep failure behaviors between HR3C/T91 dissimilar heat-resistant steel welded joints[J]. Proceedings of the CSEE, 2011, 31(11): 92-98 (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-ZGDC201111015.htm [10] 郭岩, 林琳, 侯淑芳, 等. 国产TP310HCbN钢在高温应力下的组织结构[J]. 中国电力, 2012, 45(10): 42-47 https://www.cnki.com.cn/Article/CJFDTOTAL-ZGDL201210015.htmGUO Y, LIN L, HOU S H, et al. Microstructure of domestic TP310HCbN steel after high-temperature creep-rupture test[J]. Electric Power, 2012, 45(10): 42-47 (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-ZGDL201210015.htm [11] PASTERNAK J, DOBRZANSKI J. Properties of welded joints on superheater coils made from new generation high alloy martensitic steels connected to austenitic creep-resisting steels and supper alloy grades, for supercritical parameters[J]. Advanced Materials Research, 2011, 278: 466-471 doi: 10.4028/www.scientific.net/AMR.278.466 [12] ZHANG J Q, TANG Y, ZHANG G D, et al. Numerical simulation on interfacial creep failure of dissimilar metal welded joint between HR3C and T91 heat-resistant steel[J]. Journal of Wuhan University of Technology, 2016, 31(5): 1068-1074 doi: 10.1007/s11595-016-1491-8 [13] 王晓春, 郑津洋, 孙国有. 压力容器用钢的应力状态与断裂模式的关系及其工程应用[J]. 压力容器, 2002, 19(3): 13-15, 40 https://www.cnki.com.cn/Article/CJFDTOTAL-YLRQ200203003.htmWANG X C, ZHENG J Y, SUN G Y. The relation between failure models of steels used in pressure vessel and stress-state and its engineering application[J]. Pressure Vessel Technology, 2002, 19(3): 13-15, 40 (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YLRQ200203003.htm [14] 李营, 吴卫国, 朱海清, 等. 基于大范围应力三轴度的船用低碳钢断裂特性研究[J]. 中国造船, 2016, 57(3): 54-64 https://www.cnki.com.cn/Article/CJFDTOTAL-ZGZC201603007.htmLI Y, WU W G, ZHU H Q, et al. Fracture properties of ship-build mild steel in wide range of stress triaxiality[J]. Shipbuilding of China, 2016, 57(3): 54-64 (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-ZGZC201603007.htm [15] HENRY B S, LUXMOORE A R. The stress triaxiality constraint and the Q-value as a ductile fracture parameter[J]. Engineering Fracture Mechanics, 1997, 57(4): 375-390 http://www.sciencedirect.com/science/article/pii/S0013794497000313 -
点击查看大图
图(19) / 表(5)
计量
- 文章访问数: 127
- HTML全文浏览量: 59
- PDF下载量: 20
- 被引次数: 0
