【摘要】 研究了铝热 -离心法制备的不锈钢内衬复合钢管中的残余热应力及不锈钢层的组织结构 ,分析了复合钢管不锈钢层中裂纹产生的原因。研究表明 ,不锈钢内衬层中的裂纹是钢中的夹杂及析出物使钢变脆以及冷却过程中热应力共同作用的结果更多还原

【Abstract】 The microstructure of the stainless steel layer in the composite pipe prepared by centrifu- gal- thermit process was investigated.The thermal stress distribution in the composite pipe during cooling of the fabrication process wasanalyzed by means of the finite- elementmethod.Itdemonstrat- ed thatthe high thermalstressand the brittlenessofthesteellayer,caused by nonmetalinclusionsand the precipitating phases,were responsible for the cracking of the stainlesssteel layer. During cooling, the thermal stress was high and would beyond the tensile strength of the stainless steel layer to cause cracks if itwas notto be relaxed by the plastic deformation. Increasing the plasticity and reducing the thermal stress of the stainless steel layer,the cracking could be avoided.更多还原