30CrMo钢表面堆焊Inconel625合金工艺及组织性能

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中图分类号：TG442 文献标志码：A

Abstract：The Inconel 625 nickel based aloywasdepositedon 3OCrMo steel substrate using hot wire TIGwelding proce. Theeffectsofdiferentpreheating temperaturesonthemicrostructureandpropertiesofdepositedjointandlayerwerenalyzed andcompared，through whichareasonable hotwireTIG welding process wasdetermined.Itisfoundthat Inconel625 nickel basedally presents goodbonding with3OCrMo steelbasematerial，andthereareno welding defects.The preheating temperaturehasslightefectontheformationmorphology，corosionresistance，andjointbendingperformanceof theoverlylayer.The bending performanceof thebasemetal jointisgoodatalltemperatures，andthereisnocrackingphenomeno.Howeverithas asignificantimpactonthehardnessoftheheataffectedzoneandthefusionratiooftheoverlylayer.Themicrostructureofeach temperatureoverlylayerisdendriticaustenite，transioningfrominsidetoouterintocellar，columnar，dendritic，andequiaxed crystals.Aftersurfacing，themainelementssuchasFe，Ni，Cr，Mo，andNbaredistributedregularlyinthebasemetal， heataffctedzone，andsurfacinglayer.ThereissegregationofMoandNbelementsbetweendendrites.Consideringthe welding efficiency，dilution rate，and performance of the welding specimen，preheating 200 C before welding is the best.

Keywords： 3OCrMo stel ；nickel based alloy；hot wire TIG surfacing process；microstructure；hardness；corosionproperty

国内已探明的天然气资源中，酸性油气田也占了相当大的比例[1-3]，深层的油气中含有大量的腐蚀介质，如硫化氢、二氧化碳和高氯化物等，在酸性油气田的开采过程中，如果选材或防腐措施不当，会对开采设备、管线中的金属材料造成严重的腐蚀，威胁安全生产[4-5]。（剩余10241字）