【摘要】 用有限元方法计算了铝热离心法制备不锈钢内衬复合钢管过程中的残余热应力分布。分析了钢管壁厚、复合钢管半径及冷却条件对残余热应力分布的影响。结果表明 ,缓慢冷却到室温后 ,不锈钢层中有很大的周向残余拉应力 ,已超过不锈钢层的抗拉强度。钢管壁厚及复合钢管半径对残余周向热应力分布的影响不明显。复合钢管半径对径向残余热应力的影响较明显 ,复合钢管半径越大 ,径向残余压应力越小。复合钢管制备时 ,在高温状态下直接在复合钢管外表面喷水能在不锈钢层表面造成压应力状态 ,有利于防止裂纹生成更多还原

【Abstract】 The thermal stress distribution of the stainless steel lined composite steel pipe prepared by centrifugal-SHS process was calculated by the finite element method under thermoelastic assumption. The effects of the wall-thickness of carbon steel pipe, the radius of the composite pipe and the cooling condition on the thermal stress distribution were studied. The results show that the circumferential thermal stress was high and would beyond the tensile strength of the stainless steel layer. The effects of the wall-thickness of carbon steel pipe and the radius of the composite pipe on the circumferential thermal stress were small. The radius of the composite pipe has a profound effect on the radial thermal stress. The radial thermal stress decrease with increasing the radius of the composite pipe. The circumferential thermal stress in the stainless steel layer could be depressed by water cooling on the surface of the carbon steel pipe, and even more, the tensile state could be changed into the compressive state.更多还原