机械制造文摘
一焊楼分册
专题研究
不锈钢复合板界面和焊接接头显微组织分析
刘宝玺1,2，股福星",2丁宗凯
（1.河北工业大学能源装备材料技术研究院，天津300132；2.天津市层状复合与界面控制重点试验室，
天津300132；3.华能霞浦核电有限公司，福建宁德352000）
摘要：通过对称组坏和真空热轧技术，成功制备了不锈钢复合板，其界面过渡层主要包括脱碳层、界面和渗碳层，这主要是由于在温度和压力作用下，合金元素相互扩散所造成的。通过弯曲测试发现界面结合较为优良，无脱层裂纹存在。通过弯管和焊接工艺，获得焊接接头优良的不锈钢复合管，其焊缝、熔合区和热影响区无宏观和微观缺陷存在，不锈钢层热影响区晶粒较为粗大，随着离焊缝距离的减小，碳钢层组织由不完全重结晶区转变为完全重结晶区，又过渡至粗晶区，而不锈钢焊缝随着离熔合区距离的增加，由少量的平面晶转变为胞状晶，最后转变为树枝晶。
关键调：不锈钢复合管；界面组织；脱层裂纹；焊缝组织中图分类号：TG406
Interfacecharacteristicsandweldedjointmicrostructure
ofstainlesssteelcladplate Liu Baoxi'.2, Yin Fuxing'2,Ding Zongkai
(1. Research Institute for Energy Equipment Materials, Hebei University of Technology, Tianjin 300132, China; 2. Tianjin Key Laboratory of Materials Laminating Fabrication and Interfacial Controlling Technology , Tianjin
300132, China; 3. Huaneng Nuclear Power Co., Lid., Ningde 352000, Fujian, China)
Abstract: The stainless steel clad plate was successfully fabricated by laying up symmetric and vacuum hot rolling, The interfacial transition zone contains decarburized layer, interface and carburized layer, which is at-tributed to the diffusion of alloy element at the interface under the high pressure and temperature condition. The bending test reveals a prefect interface presented in the clad plate, without obvious delamination crack. The stainless steel clad pipe with excellent welded joint can be obtained by elbow and welding. There are no macro scopic and microscopic defects in the weld zone, fusion zone and heat affected zone. The heat affect zone of stainless steel layer is comprised of coarse grain, whereas the heat affect zone of carbon steel layer contains coarse grain area, completely recrystallized zone and partial recrystallized zone. With the increase of distance between weld zone and fusion zone, the small plane grain changes into a cellular crystal grain, and finally into a dendrite in the stainless steel weld zone
Key words: stainless steel clad pipe; interface microstructure; delamination crack; weld microstructure
0前言
随着经济的发展和社会的进步，核电设备、石油化工和海水淡化领域都驱需含Cr，Ni等合金元素的
万方数据
不锈钢制品。然而为了降低成本、节约资源和保证服役性能，国内外经常利用不锈钢复合板来代替昂贵的不锈钢材料。不锈钢复合板是通过特定方式将不锈钢和碳钢结合在一起，可充分发挥不锈钢的耐蚀、耐
2016年第3期
9