铝热-离心法制备的不锈钢内衬复合钢管不锈钢层裂纹成因分析

详细信息

STRESS AND CAUSE OF CRACK FORMATION IN STAINLESS STEEL LINED COMPOSITE STEEL PIPE BY CENTRIFUGAL-THERMIT PROCESS

School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083,China

摘要

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。
- 复合钢管 /
- 不锈钢 /
- 热应力 /
- 裂纹 /
- 燃烧合成
Abstract: The microstructure of the stainless steel layer in the composite pipe prepared by centrifugal-thermit process was investigated. The thermal stress distribution in the composite pipe during cooling of the fabrication process was analyzed by means of the finite-element method. It demonstrated that the high thermal stress and the brittleness of the steel layer, caused by nonmetal inclusions and the precipitating phases, were responsible for the cracking of the stainless steel layer. During cooling, the thermal stress was high and would beyond the tensile strength of the stainless steel layer to cause cracks if it was not to be relaxed by the plastic deformation. Increasing the plasticity and reducing the thermal stress of the stainless steel layer, the cracking could be avoided.
- composite pipe /
- stainless steel /
- thermal stress /
- cracks /
- combustion synthesis