S31008不锈钢焊接全流程质控技术优化研究

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Abstract：Todressthedefectssuchashotcracks，Ophase precipitation，andintergranularcorosionthatareprone tooccurinthe welding jointsofeatresistantusteniticstainlessstelS38，thisppersystematicalstudedteweldingperfoanceadhigh temperaturefailuremechanismofthisstainlessteeltroughtheoptimizeddesignofthematchingofweldingmaterials，thecontrolof gradientheatinput，ndthedynamiccoolingprocessBasedonorthogonaltestsndstandardtests，thepaperrevealedthehbitory effectoftecoordnatedontrolofeatiputandinterlaertempratureonthprecipiatonbehaviorofarbdesndonstructefullprocessqualitycontrolsystemcovering pre-welding purificationtreatment，processparametermonitoring，andpost-welding microstructureoptiization.Theresultsshowtattheoptimizedprocesscanincreasetheigtemperaturestrengthoftheweldingjoint to 92% of that of the base metal and reduce the intergranular corrosion rate by 45% ， providing a standardized solution for the welding andmanufacturingofhigh-temperature pressre-bearing equipmentsuchaspetrochemicalreactorsandnuclearsteamgenerators.

Keywords：S31Oo8 stainless steel; weldability; high-temperature tensile creep test; heat inputcontrol

S31008（06Cr25Ni20）是一种高铬高镍耐热型奥氏体不锈钢，凭借其优异的高温强度（ 1150∘C 下抗氧化性达 0.12mg⋅cm-2⋅h-1. ）与抗蠕变性能0 700∘C/70MPa 断裂时间 >100h ），在石油化工、锅炉制造、航空业及其他高温、氧化环境中得到了广泛应用。（剩余4208字）