含不同循环变形历史P92钢的高温拉伸性能
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摘要
在650℃下对P92钢进行不同周次循环加载试验,再在650℃下进行拉伸试验,研究了循环变形对其显微组织和高温拉伸性能的影响。结果表明:未循环变形P92钢的显微组织由细小板条马氏体组成,马氏体内存在亚晶粒和位错,晶界析出M23C6碳化物,循环变形后钢中板条马氏体发生明显回复,亚晶粒长大、位错向胞状结构转变;与未循环变形相比,循环变形后P92钢的高温拉伸性能明显降低,且抗拉强度和屈服强度随循环周次的增加而降低;循环变形对P92钢的拉伸断裂机制没有产生明显影响,拉伸断口均存在明显韧窝,拉伸断裂机制均为韧性断裂。
Cyclic loading tests at 650℃for different number of cycles were conducted on P92 steel,and then tensile tests at 650 ℃ were carried out on the steel.The effects of cyclic deformation on microstructure and high temperature tensile property were studied.The results show that the microstructure of P92 steel without cyclic deformation consisted of fine lath martensite;subgrains and dislocations existed inside the martensite and M23 C6 carbide precipitated on the boundaries.After cyclic deformation,the recovery of the lath martensite in the steel occurred obviously,the subgrains grew and the dislocations changed to the cellular-like structure.Compared with those without cyclic deformation,the high temperature tensile properties of the P92 steel after cyclic deformation decreased significantly,and the tensile strength and yield strength decreased with the increase of the number of cycles.The cyclic deformation did not greatly influence the tensile fracture mechanism of the P92 steel;dimples appeared on the tensile fracture surface,indicating that the tensile fracture mechanism was ductile fracture.
Cyclic loading tests at 650℃for different number of cycles were conducted on P92 steel,and then tensile tests at 650 ℃ were carried out on the steel.The effects of cyclic deformation on microstructure and high temperature tensile property were studied.The results show that the microstructure of P92 steel without cyclic deformation consisted of fine lath martensite;subgrains and dislocations existed inside the martensite and M23 C6 carbide precipitated on the boundaries.After cyclic deformation,the recovery of the lath martensite in the steel occurred obviously,the subgrains grew and the dislocations changed to the cellular-like structure.Compared with those without cyclic deformation,the high temperature tensile properties of the P92 steel after cyclic deformation decreased significantly,and the tensile strength and yield strength decreased with the increase of the number of cycles.The cyclic deformation did not greatly influence the tensile fracture mechanism of the P92 steel;dimples appeared on the tensile fracture surface,indicating that the tensile fracture mechanism was ductile fracture.
引文
[1]全国人民代表大会.中华人民共和国国民经济和社会发展第十三个五年规划纲要[EB/OL].(2016-03-17)[2018-05-02].http://www.xinhuanet.com/politics/2016lh/2016-03/17/c_1118366322.htm.
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[11] KIMURA M,YAMAGUCHI K,HAYAKAWA M,et al.Microstructures of creep-fatigued 9-12%Cr ferritic heatresisting steels[J].International Journal of Fatigue,2006,28(3):300-308.
[12] FOURNIER B,SAUZAY M,PINEAU A.Micromechanical model of the high temperature cyclic behavior of 9-12%Cr martensitic steels[J].International Journal of Plasticity,2011,27(11):1803-1816.
[13] GOLA'NSKI G,MROZI'NSKI S.Low cycle fatigue and cyclic softening behaviour of martensitic cast steel[J].Engineering Failure Analysis,2013,35:692-702.
[14] MARIAPPAN K,SHANKAR V,SANDHYA R,et al.Comparative assessment of remnant tensile properties of modified 9Cr-1Mo steel under prior low cycle fatigue and creep-fatigue interaction loading[J].International Journal of Fatigue,2017,103:342-352.
[15]黄鑫,王小威,张威,等.疲劳载荷对P92钢高温拉伸性能的影响[J].机械工程材料,2017,41(12):49-53.
[16] GIROUX P F,DALLE F,SAUZAY M,et al.Mechanical and microstructural stability of P92 steel under uniaxial tension at high temperature[J]. Materials at High Temperatures,2010,27(1):29-34.
[17] ZHANG Z,HU Z F,SCHMAUDER S,et al.Low-cycle fatigue properties of P92ferritic-martensitic steel at elevated temperature[J].Journal of Materials Engineering and Performance,2016,25(4):1650-1662.
[2]王小威,巩建鸣,郭晓峰,等.超超临界发电厂中P92钢蠕变特性及断裂机制[J].南京工业大学学报(自然科学版),2014,36(3):32-38.
[3] WANG X W,GONG J M,ZHAO Y P,et al.Characterization of low cycle fatigue performance of new ferritic P92steel at high temperature:Effect of strain amplitude[J].Steel Research International,2015,86(9):1046-1055.
[4] HAMDOON M,DAS S,ZAMANI N,et al.Experimental study on the effect of strain cycles on mechanical properties of AISI 1022steel[J].Strain,2011,47(S2):386-392.
[5] MO'CKO W, KOWALEWSKI Z L.Evolution of tensile properties of the TiAl6V4alloy due to the prior cyclic loading history[J].Journal of Theoretical and Applied Mechanics,2014,52(3):847-851.
[6] SNCHEZ-SANTANAU, RUBIO-GONZLEZC,MESMACQUE G,et al.Dynamic tensile behavior of materials with previous fatigue damage[J].Materials Science and Engineering:A,2008,497(1/2):51-60.
[7] SNCHEZ-SANTANAU, RUBIO-GONZLEZC,MESMACQUE G,et al.Effect of fatigue damage induced by cyclic plasticity on the dynamic tensile behavior of materials[J].International Journal of Fatigue,2008,30(10):1708-1719.
[8] SNCHEZ-SANTANAU, RUBIO-GONZLEZC,MESMACQUE G,et al.Effect of fatigue damage on the dynamic tensile behavior of 6061-T6aluminum alloy and AISI4140Tsteel[J].International Journal of Fatigue,2009,31(11):1928-1937.
[9] MARIAPPAN K,SHANKAR V,SANDHYA R,et al.Influence of prior fatigue damage on tensile properties of316L(N)stainless steel and modified 9Cr-1Mo steel[J].Metallurgical and Materials Transactions A,2015,46(2):989-1003.
[10] WANG X,JIANG Y,GONG J,et al.Characterization of low cycle fatigue of ferritic-martensitic P92steel:Effect of temperature[J].Steel Research International,2016,87(6):761-771.
[11] KIMURA M,YAMAGUCHI K,HAYAKAWA M,et al.Microstructures of creep-fatigued 9-12%Cr ferritic heatresisting steels[J].International Journal of Fatigue,2006,28(3):300-308.
[12] FOURNIER B,SAUZAY M,PINEAU A.Micromechanical model of the high temperature cyclic behavior of 9-12%Cr martensitic steels[J].International Journal of Plasticity,2011,27(11):1803-1816.
[13] GOLA'NSKI G,MROZI'NSKI S.Low cycle fatigue and cyclic softening behaviour of martensitic cast steel[J].Engineering Failure Analysis,2013,35:692-702.
[14] MARIAPPAN K,SHANKAR V,SANDHYA R,et al.Comparative assessment of remnant tensile properties of modified 9Cr-1Mo steel under prior low cycle fatigue and creep-fatigue interaction loading[J].International Journal of Fatigue,2017,103:342-352.
[15]黄鑫,王小威,张威,等.疲劳载荷对P92钢高温拉伸性能的影响[J].机械工程材料,2017,41(12):49-53.
[16] GIROUX P F,DALLE F,SAUZAY M,et al.Mechanical and microstructural stability of P92 steel under uniaxial tension at high temperature[J]. Materials at High Temperatures,2010,27(1):29-34.
[17] ZHANG Z,HU Z F,SCHMAUDER S,et al.Low-cycle fatigue properties of P92ferritic-martensitic steel at elevated temperature[J].Journal of Materials Engineering and Performance,2016,25(4):1650-1662.