焊接热处理残余力是指热处理后工件的残余应力,它对工件的形状、尺寸和性能有着很重要的影响,超过材料屈服强度时,会引起变形,超过焊接材料强度极限时,会产生裂纹,应该减少和消除。
Weldingheattreatmentresidualstressreferstotheresidualstressoftheworkpieceafterheattreatment,whichhasaveryimportantimpactontheshape,sizeandperformanceoftheworkpiece.Whenthematerialyieldstrengthexceeds,itwillcausedeformation.Whenthestrengthlimitofweldingmaterialexceeds,itwillproducecracks,whichshouldbereducedandeliminated.
1.钢的热处理应力
1.Heattreatmentstressofsteel
在加热冷却过程中,冷却时间和速度不一致形成温差,导致体积膨胀和收缩,产生热应力,在热应力的作用下,工件表层受压而心部受拉,这一现象受热处理工艺、冷却速度和材料成分等影响,冷却速度快,合金成分和碳含量高,在热应力作用下产生的塑性变形越大,形成的残余应力就越大。
Intheprocessofheatingandcooling,thedifferenceofcoolingtimeandspeedleadstovolumeexpansionandcontraction,resultinginthermalstress.Undertheeffectofthermalstress,thesurfacelayeroftheworkpieceis
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