耐热钢叶片螺栓毛坯锻造开裂分析  

Analysis on forging crack of heat-resistant steel blade bolt blank

作　　者：唐华[1] 肖峰[1] 李海荣[1] 张玉波[1] 

机构地区：[1]四川工程职业技术学院材料工程系,四川德阳618000

出　　处：《锻压技术》2012年第4期29-32,共4页Forging & Stamping Technology

基　　金：国家科技重大专项资助项目(2009ZX04014-102-03)

摘　　要：针对用于制造超超临界机组叶片螺栓的耐热钢10Cr10NiMoW2VNbN毛坯经锻造调质处理后,在毛坯中心出现贯穿性裂纹这一现象,通过硬度试验发现裂纹处硬度值偏低,光学金相显示裂纹附近有大量类似夹杂物分布,利用SEM配合能谱仪进行分析发现裂纹处成分复杂无重复性,完全不同于基体成分。试验分析结果表明,该现象是由于钢材冶炼时外来的夹渣,造成锻件中心非金属夹杂物超标,并在锻造过程中诱发裂纹并扩展。为避免此类原材料缺陷问题的发生,应该增加原材料的超声波探伤检验程序。Penetrating cracks appeared in the centre of the heat-resistant steel 10Crl0NiMoW2VNbN blank of ultra su- percritieal unit blade bolt after forging and quenching. Hardness tests show the lower values and optical metallographie observation shows a lot of similar inclusions at the cracks. By SEM and EDS analysis it is found that the components of the cracks are complex and significantly different from that of the matrix. The results show that the foreign smelting slag causes excessive non-metallic inclusions in the forging center and induces the cracks propagating in the forging process. To avoid such raw material defects from happening again, it is recommended to improve the level of smelting and take strict inspection procedures of factory products, while increasing the ultrasonic testing procedures.

关 键 词：锻造毛坯 耐热钢 夹渣 

分 类 号：TG316[金属学及工艺—金属压力加工]