司太立合金防蚀片成型工艺研究
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摘要
为了提高司太立合金防蚀片的抗服役开裂性能,研究了防蚀片的成型工艺。结果表明,打磨破坏了表面应力状态,冷态弯扭可能导致样品内部缺陷,引起防蚀片在服役过程中开裂;显微组织分析发现,晶内存在大量的形变孪晶,碳化物集中分布在晶界附近,且样品表面与内部晶粒等级差异较大,出现混晶组织,影响了样品的强度、塑性和变形性能。与进口防蚀片相比,国产防蚀片存在混晶组织,Fe含量偏高,硬度及碳化物成分与进口样品相当。
In order to improve the anti-service cracking performance of steatite anti-corrosion shields, the forming process of anti-corrosion shields was studied. The results show that the surface stress state is destroyed by grinding, cold bending and torsion may lead to internal defects of the samples, which may lead to the cracking of anti-corrosion shields in service.Microstructure analysis show that there are a large number of deformation twin crystals in the crystal, and the carbide is concentrated near the grain boundary. The grade of grain on the surface of sample is quite different from that on the inside,the appearance of mixed crystal structure affects the strength, plasticity and deformation properties of samples. Compared with imported anti-corrosion shields, domestic anti-corrosion shields have mixed crystal structure, Fe content is high,hardness and carbides composition are equivalent to imported samples.
In order to improve the anti-service cracking performance of steatite anti-corrosion shields, the forming process of anti-corrosion shields was studied. The results show that the surface stress state is destroyed by grinding, cold bending and torsion may lead to internal defects of the samples, which may lead to the cracking of anti-corrosion shields in service.Microstructure analysis show that there are a large number of deformation twin crystals in the crystal, and the carbide is concentrated near the grain boundary. The grade of grain on the surface of sample is quite different from that on the inside,the appearance of mixed crystal structure affects the strength, plasticity and deformation properties of samples. Compared with imported anti-corrosion shields, domestic anti-corrosion shields have mixed crystal structure, Fe content is high,hardness and carbides composition are equivalent to imported samples.
引文
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[2]陈啸,赵龙飞,王碧童,等.2Cr13末级叶片钎焊司太立合金钎焊合理性[J].黑龙江冶金,2014,35(4):15-19.
[3]葛海华.650MW核电汽轮机低压次末级动叶司太立合金片裂纹缺陷的分析与处理[J].机械工程师,2015(8):213-215.
[4]刘玉珍,桂业伟.司太立合金的性能及应用(Ⅱ)[J].机械工程材料,1992,16(6):1-6.
[5]张定铨.残余应力对金属疲劳强度的影响[J].理化检验-物理分册,2002,38(6):231-235.
[6]李富凯.残余应力场中材料的疲劳行为[J].西安矿业学院学报,1998,18(2):154-157.
[7]付学义,刘莉.残余应力的危害及影响对策[J].宝钢科技,2006,32增刊(Z1):82-84.
[8]王仁智.金属材料喷丸强化原理及其强化机理综述[J],中国表面工程,2012,25(6):1-9.
[9]Malayoglu,U.;Neville,A.;Beamson,G.Characterization of the passive film on HIPed Stellite 6 alloy using X-ray photoelectron spectroscopy[J],Materials Science and Engineering,2005,393(1-2):91-101.
[10]R.Arabi Jeshvaghani,M.Shamanian,M.Jaberzadeh,Enhancement of wear resistance of ductile iron surface alloyed by stellite 6[J].Materials and Design,2011,32(4),2018-2033.
[11]Dariusz Bartkowski,Andraej Mlynarczak,Adam Piasecki,Bartlomiej Dudziak,Marek Goscianski,Aneta Vartkowska,Microstructure microhardness and corrosion resistance of stellite-6coatings reinforced with WC particles using laser cladding[J],Optics&Laser technology,2015,68:191-201.
[12]刘天佑.奥氏体混晶对钢力学性能的影响[J].本溪冶金高等专科学报,2003,5(3):1-5.
[13]武学强.新型钴基合金的耐蚀及热加工性能研究[D].鞍山:辽宁科技大学,2016.
[14]郝丽丽,候淑娥.HP40裂解炉管组织及裂纹产生原因分析[J].失效分析与预防,2007,2(4):45-49.
[15]李俊虎,20钢火药筒射击开裂原因分析[J],物理测试,2005,23(1):48-49.
[16]V.Kuzucu,M.Ceylan,H.Celik,I.Aksoy,Microstructure and phase analyses of stellite 6 plus 6wt%Mo alloy[J].Journal of Materials,2007,69:257-263.
[17]Jiang W.H.;Guan,H.R.;Hu,Z.Q.Effects of heat treatment on microstructures and mechanical properties of a directionally solidified cobalt-base superalloy[J],Materials Science and Engineering A.,1999,271(1-2):101-108.
[18]Xu Yangtao,Xia Tiandong,Huang Yanling,Microstructures Comparison of Stellite 6 Alloy by Self-Propagating High-Temperature Synthesis and Cast HS111 Alloy[J].Rare Metal Materials and Engineering,2008,38(8):1333-1337.