摘要
在抛光1 Cr13不锈钢基底上采集了大气等离子喷涂的钼层片．利用台阶仪、扫描电子显微镜（ SEM ）、能谱仪（EDS）、电子背散射衍射（EBSD）等表征了层片的形貌、微观组织和晶体学取向分布．结果表明，钼层片呈“花瓣状”，并伴有铺展飞溅．基底在层片中心处因熔化／撞击形成“凹坑”，平均深度0．7μm．层片中心区域为细小的柱状晶，晶粒尺寸范围0．75～9．25μm，平均值为2．30μm；边缘区域为沿着径向拉长的晶粒，晶粒尺寸范围4．25～18．25μm，平均值8．50μm．层片边缘区域因翘曲，接触热阻较中心区域大，造成晶粒粗大．无论是层片中心区域还是边缘区域晶粒取向都随机分布，没有明显织构．
Atmospheric plasma sprayed molybdenum splats were collected on polished 1Cr13 stainless steel. The morphology,microstructure and crystalline orientation distribution of the splat was characterized by surface profiler,energy dispersive spectrometer( EDS),scanning electron microscope( SEM) and electron-backscattered diffraction( EBSD). The results show that the morphology of splat is flower-like type with spread splashing. Because of substrate melting and droplet impacting,substrate beneath the splat center forms a crater with the average depth of 0. 7 μm. Fine columnar grains whose sizes ranging from0. 75 to 9. 25 μm with average valve of 2. 30 μm form in the central region of splat. The splat has radially elongated grains with sizes between 4. 25 to 18. 25 μm in the peripheral region. The average grain size of elongate grains is 8. 50 μm. The thermal resistance of peripheral region is higher than that of central region due to curling,thus the grain is coarser. Regardless of central region of splat or peripheral region,grains show random crystalline orientation and no evident texture is observed.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2016年第6期95-98,133,共4页
Transactions of The China Welding Institution
关键词
等离子喷涂
层片
显微组织
晶体取向
电子背散射衍射
plasma spraying
splat
microstructure
crystalline orientation
electron-backscattered diffraction
