Acta Metallurgica Sinica (English Letters) ›› 1999, Vol. 12 ›› Issue (4): 626-629.

• Research paper • Previous Articles     Next Articles

EFFECT OF WELDING THERMAL CYCLE ON THE MICROSTRUCTURE AND TOUGHNESS OF LOW ALLOY HIGH STRENGTH STEEL

C.S.Hu1,2) and Y.X.Gu3) 1) Department of Mechanical Engineering ,Fushun Petroleum Institute,Fushun 113001 ,China 2) State Key Laboratory for Corrosion and Protection ,Institute of Corrosion and Protection of Metal, The Chi nese Academy of Science,Shenyang 110015 ,China 3) Departmentof Materials Scienceand Engineering ,Shenyang Polytechnic University,Shenyang 110023 ,China   

  • Received:1999-08-25 Revised:1999-08-25 Online:1999-08-25 Published:2009-10-10

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Abstract: Weldingthermalcyclicsimulated techniquesisemployed in thestudy. By meansof analysismetalloscope, fracture morphology and impact toughness test of the sample, the effect ofweldingthermalcycle peak temperature and dualthermal cycle on the micro structure and toughnessoflow alloy high strength steel HQ100 isinvestigated.Inner fine martensitic andbainitic microstrctureisobservedby TEM.Theresultsshow that withtheincreaseof peaktem perature, grain sizesbecomelarger,theimpacttoughness drop down .Ifthermalcycleisim posed twiceand dualthermalcyclicpeaktemperatureis1275 ℃+ 750 ℃,theimpacttoughnessisatthelowest value.Alsotheimpacttoughnessagrees withthefracture morphology.

Key words: thermalcycle, peaktemperature, high strengthsteel, microstructure and toughness

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