10Ni5CrMoV鋼晶粒超細化熱處理工藝研究.pdf

1、哈爾濱工程大學碩士學位論文10Ni5CrMoV鋼晶粒超細化熱處理工藝研究姓名：吳大銀申請學位級別：碩士專業(yè)：材料加工工程指導教師：楊世偉20081201哈爾濱T稃大學碩十學位論文Abstract10Ni5CrMoVisasortofhi曲strengthlowalloysteeldevelopedbyournationwithstrengthmorethan785MPaItisalsooneofsheepplateswithhighes

2、tstrengthInordertofurthertapthepropertypotentialofthesteel，thispaperfocusesonpromotethecombinationmechanicpropertiesbyultra—finingtreatmetatThemechanismofgraingrowthisdeterminedbyaustenitizingtreatmentatvarioustemperatur

3、esThemechanismsofstructureinheritanceandrecrystallizationareinvestigatedbysecondaryquenchingatvariousheatingtemperaturesandheatpreservationtimesTheexploratoryresearchontheprocessingofcircleheating—quenchingwascarriedoutT

4、hesizeofinitialaustenitizinggrainaftercircleheatingquenchingwasmeasuredaccordingto“Metel—methodsforestimatingtheaveragegrainsize”，andtheeffectofparametersonthedegreesoffiningwasevaluatedTheresultsindicated，graingrownsign

5、ificantlyataustenitizingtemperatureabove1200“C；structureinheritancepresentattheheatingtemperaturebetweenAc3925℃，gentlydecayedwithincreaseofheatingtemperatureandheatpreservationtime；whileatthetemperaturerangeof940960℃，the

6、10Ni5CrMoVsteelrecrystallizecompletedandstructureinheritancetotallydisappeare；andthefinedgrainbegantogrowfrom970。C，raisingthequenchingtemperatureledtOthegrowthoffinedgrainandloweredthefiningeffectThesizeofgraincouldbefin

7、edtoASTM12degreebasedoncircleheating—quenchingbytripleshort—timecircleheating—quenching(aboutlOOs)Itwasconcludedthattriple100s—heatingcircleat950。Cistheoptimalcircleheating—quenchingof10Ni5CrMoVsteel，thegrainsizecannotbe