作　　者： (刘悦）; (熊建坤）; (赵海燕）; (钟杰）;

机构地区： 清华大学机械工程系,北京100084 清华大学摩擦学国家重点实验室,北京100084

出　　处： 《焊接学报》 2017年第8期82-86,共5页

摘　　要： Hastelloy X和Haynes 230分别是F级和G/H级燃烧室薄壁筒体用的镍基高温合金,采用光纤激光器对2mm厚度的两类镍基合金板材进行焊接试验,并对比焊态及焊后固溶处理的接头组织性能.结果表明,焊态Hastelloy X的焊缝中碳化物呈网络状析出,其硬度高、韧性差,固溶处理后出现栅状组织及脆性Fe2W相.在焊缝一次枝晶内的枝晶生长方向线性排列,取向各异,热影响区晶内也存在栅状组织.Haynes 230晶粒较小,焊缝碳化物沿树枝晶晶界链状断续析出,固溶处理后平直晶界变为弯曲晶界,蠕变性能得到提高. Hastelloy X and Haynes 230 are nickel based alloy used for combustion chamber tube of F class and G/H class gas turbine respectively.The alloys are processed into plates with thickness of 2 mm and fiber laser are adopted for the welding.Welded joints as welded and solution heat treated are taken into comparison and analysis.Results show that,As to Hastelloy X as welded,it's of high hardness and weak toughness with network carbides precipitated in weld beam.While after solution heat treatment,palisade tissues and brittle Fe2 W phase are present in weld beam.As for Haynes 230 as welded,it's of smaller grain size than Hastelloy X as welded.Besides,carbides are discontinuously precipitated along dendrite grain boundary.After solution heat treatment,straight grain boundary transferred to zigzag one and creep property gets improved.

关 键 词： 镍基合金 激光焊接 组织分析