304不锈钢喷砂助低温渗铝工艺  

Low-temperature aluminizing process of 304 stainless steel assisted by sand blasting

作　　者：李亚敏[1] 侯树峰[1] Li Yamin Hou Shufeng(State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou Gansu 730050, Chin)

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050

出　　处：《金属热处理》2016年第12期107-112,共6页Heat Treatment of Metals

摘　　要：采用喷砂技术对304不锈钢板表面进行处理,并对喷砂处理后的试样进行热处理和低温固体粉末包埋渗铝处理,分析讨论了喷砂助低温渗铝的最佳工艺参数。结果表明：表面经喷砂处理后,试样表层形成厚约250μm的变形区,同时表面发生了马氏体相变,硬度明显提高。喷砂试样经400~600℃热处理后,变形层组织仍为马氏体相,硬度有所下降,变形层具有热稳定性。表面喷砂处理可以降低渗铝温度,提高渗铝速度。最佳渗铝工艺为经过优化喷砂工艺处理后在530℃渗铝3 h随炉冷却,试样表面可形成约50μm的渗层,渗层主要由金属间化合物FeAl_2构成,表面硬度可达640 HV0.2。Surface of 304 stainless steel plate was treated by sand blasting technology, and then followed by powder aluminizing and heat treating, and the best process parameters of low-temperature aluminizing on 304 stainless steel assisted by sand blasting was investigated. The test results show that a deformed zone with a depth of about 250 μm is formed on the surface of the specimen after sand blasting. Meanwhile, there is martensite transformation on the surface, thus resulting in a significant increase of surface hardness. After heat treating at the range of 400-600 ℃, the microstructure of the deformed zone is still martensite, with the treating temperature increasing, the hardness decreases gradually, so the deformed zone has thermal stability. The aluminizing temperature is decreased and the aluminizing speed is improved by sand blasting surface treatment. The best aluminizing technology is as follows, after optimized sand blasting then aluminizing at 530 ℃ for 3 h with furnace cooling. The Aluminized layer on the specimen can reach 50 μm thickness after aluminizing treatment, and the layer consists mainly FeAl2 phase, which hardness can be reached 640 HV0.2.

关 键 词：304不锈钢 喷砂 渗铝 

分 类 号：TG156.8[金属学及工艺—热处理]