超超临界机组中压调门Inconel783合金螺栓断裂的原因
Fracture Cause of Inconel783 Alloy Bolt in Medium-Pressure Control Valve of an Ultra-supercritical Unit
摘 要
某超超临界机组中压调门Inconel783合金螺栓在高温高压条件下服役时发生断裂。采用宏观检查、显微组织分析、力学性能测试以及物相分析等方法研究了螺栓的断裂原因。结果表明：该螺栓断裂性质为应力加速晶界氧化脆性断裂。螺栓热处理不当导致奥氏体晶界不连续，未生成连续的β-AlNi相；当在高温高应力环境下服役时，氧在应力的作用下沿晶界快速扩散，导致晶界脆化而萌生沿晶裂纹，裂纹扩展导致螺栓断裂。
沿晶断裂
二次裂纹
β-AlNi相
应力加速晶界氧化
Inconel783 alloy bolt
intergranular fracture
secondary crack
β-AlNi phase
stress-accelerated grain boundary oxidation
Abstract
Inconel783 alloy bolts in the medium-pressure valve of an ultra-supercritical unit fractured during service under high temperature and high pressure conditions. The cause of fracture was studied by macroscopic inspection, microstructure analysis, mechanical property test and phase analysis. The results show that the bolts fractured in a stress-accelerated grain boundary oxidation brittle fracture mode. Improper heat treatment of the bolt resulted in incomplete austenite grain boundaries without continuous β-AlNi phase. When the bolt was used under high temperature and high stress conditions, oxygen diffused along the grain boundary rapidly under stresses, resulting in the embrittlement of grain boundaries; therefore the intergranular cracks were initiated. The cracks propagated, and eventually led to the fracture of the bolt.
中图分类号 TG111.91 DOI 10.11973/jxgccl201910014
所属栏目 失效分析
基金项目
收稿日期 2018/9/5
修改稿日期 2019/8/15
网络出版日期
作者单位点击查看
备注罗畅(1991-),男,湖北孝感人,助理工程师,硕士
引用该论文: LUO Chang,QIAN Yujun,LIU Junjian,WU Yue,WANG Yan. Fracture Cause of Inconel783 Alloy Bolt in Medium-Pressure Control Valve of an Ultra-supercritical Unit[J]. Materials for mechancial engineering, 2019, 43(10): 71～74
罗畅,钱玉君,刘俊建,吴跃,王严. 超超临界机组中压调门Inconel783合金螺栓断裂的原因[J]. 机械工程材料, 2019, 43(10): 71～74
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参考文献
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【10】彭以超, 楼玉民, 徐绍平, 等. 超超临界机组中压汽门阀盖Alloy783合金螺栓断裂失效分析[J]. 热力发电, 2018, 47(3):115-122.
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【13】沈治, 沈红卫, 孙锋, 等. IN783合金热处理工艺的热动力学评估及成分设计[J]. 动力工程学报, 2010, 30(4):287-292.
【14】李生志,付立铭,单爱党.扩散退火对Inconel 783合金显微组织及力学性能的影响[J].机械工程材料,2016,40(8):7-11.
【2】李君, 吴少华, 李振中. 超超临界燃煤发电技术是我国目前发展洁净煤发电技术的优先选择[J]. 中国电力, 2004, 15(9):30-35.
【3】史轩. 超超临界电站锅炉关键材料的新进展[J]. 机械工程材料, 2009, 33(9):1-5.
【4】闫超鹏, 孙锋, 单爱党,等. 超超临界火电机组用铁素体耐热钢的研究现状[J]. 机械工程材料, 2008, 32(12):1-4.
【5】龙会国, 龙毅, 陈红冬. 高温螺栓组织典型失效形式[J]. 汽轮机技术, 2011, 53(2):157-158.
【6】MA L, CHANG K M, MANNAN S K, et al. Effect of prolonged isothermal exposure on elevated-temperature, time-dependent fatigue-crack propagation in INCONEL alloy 783[J]. Metallurgical and Materials Transactions A, 2002, 33(11):3465-3478.
【7】谢锡善. 我国高温材料的应用与发展[J]. 机械工程材料, 2004, 28(1):2-8.
【8】MA L, CHANG K M. Effects of different metallurgical processing on microstructures and mechanical properties of Inconel alloy 783[J]. Journal of Materials Engineering and Performance, 2004, 13(1):32-38.
【9】MA L, CHANG K M, MANNAN S K. Oxide-induced crack closure:An explanation for abnormal time-dependent fatigue crack propagation behavior in INCONEL alloy 783[J]. Scripta Materialia, 2003, 48(5):583-588.
【10】彭以超, 楼玉民, 徐绍平, 等. 超超临界机组中压汽门阀盖Alloy783合金螺栓断裂失效分析[J]. 热力发电, 2018, 47(3):115-122.
【11】BRICKNELL R H, WOODFORD D A. Grain boundary embrittlement of the iron-base superalloy IN903A[J]. Metallurgical Transactions A, 1981, 12(9):1673-1680.
【12】HECK K A, SMITH J S, SMITH R. INCONEL® alloy 783:An oxidation-resistant, low expansion superalloy for gas turbine applications[J]. Journal of Engineering for Gas Turbines and Power, 1998, 120(2):363-369.
【13】沈治, 沈红卫, 孙锋, 等. IN783合金热处理工艺的热动力学评估及成分设计[J]. 动力工程学报, 2010, 30(4):287-292.
【14】李生志,付立铭,单爱党.扩散退火对Inconel 783合金显微组织及力学性能的影响[J].机械工程材料,2016,40(8):7-11.
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