316L钢表面Fe-Al/Al_(2)O_(3)涂层的制备及其高温氧化行为  

Preparation and its high-temperature oxidation behavior of Fe-Al/Al_(2)O_(3) coating on 316L steel

作　　者：肖来荣[1,2] 苏衡 赵小军[1,2] 蔡圳阳 陈伟[1] 余华丽[1] XIAO Lai-rong;SU Heng;ZHAO Xiao-jun;CAI Zhen-yang;CHEN Wei;YU Hua-li(School of Materials Science and Engineering,Central South University,Changsha 410083,China;Key Laboratory of Nonferrous Metal Materials Science and Engineering,Ministry of Education,Central South University,Changsha 410083,China)

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]中南大学有色金属材料科学与工程教育部重点实验室,长沙410083

出　　处：《中国有色金属学报》2022年第3期823-835,共13页The Chinese Journal of Nonferrous Metals

基　　金：湖南省高新技术产业科技创新引领计划项目(2020GK4066,2022GK4027);国家自然科学基金资助项目(51901252)。

摘　　要：316L奥氏体不锈钢(简称316L钢)具有优良的高温力学、耐侵蚀等性能,在航空、核能等领域具有广泛应用。然而,316L钢在高温氧化环境下长期服役时,易产生开裂、剥落等缺陷而失效。采用热轧复合、退火热处理和原位氧化的方式在316L钢表面制备了Fe-Al/Al_(2)O_(3)高温抗氧化涂层,利用XRD、SEM、EDS等手段对试样的物相组成和组织形貌进行了表征,对比研究含有Fe-Al/Al_(2)O_(3)涂层的试样和316L钢的高温氧化行为。结果表明:316L钢和纯铝箔经热轧后,复合板界面的平均结合强度为54.47 N/mm^(2);铝/钢复合板经不同温度退火6 h后,发现750℃退火试样扩散层的厚度急剧增加,几乎占据全部铝层;选择750℃退火试样进行1 h的原位氧化,制得了Fe-Al/Al_(2)O_(3)涂层,其截面结构由表及里依次为Al_(2)O_(3)、FeAl_(2)、FeAl、α-Fe(Al)和Fe;原位氧化试样和316L钢分别经900℃空气氧化72 h后,发现二者的氧化过程均符合抛物线规律,而原位氧化试样氧化质量的增加仅为316L钢的1/11,具有优良的高温抗氧化性能。Fe-Al/Al_(2)O_(3)high-temperature anti-oxidant coating was prepared on the surface of 316L steel by hotrolling composite,annealing heat treatment and in-situ oxidation.The specimens were characterized by using SEM,EDS and XRD,respectively.Meanwhile,the high-temperature oxidation behavior of the in-situ oxidized specimens containing Fe-Al/Al_(2)O_(3)coating and 316L steel was investigated comparatively.The results show that the hot-rolled composite plate obtained by holding 316L steel and pure aluminum is well bonded,and the average bond strength of composite plate is obtained as 54.47 N/mm2.Then,the composite plate is held at different temperatures for 6 h for annealing heat treatment.The specimens preferably annealed at 750℃for 6 h with optimum thickness were selected to be oxidized in-situ for 1 h.The Fe-Al/Al_(2)O_(3)coating is obtained,and its crosssectional structures in order from the surface to the inside are Al_(2)O_(3),FeAl_(2),FeAl,α-Fe(Al)and Fe.When the insitu oxidized specimen and 316L steel were oxidized at 900℃for 72 h,the oxidation process of them conforms to the parabolic law together.While the oxidation mass gain of the in-situ oxidized specimen is only 1/11 of that of 316L steel,which has excellent high temperature oxidation resistance.

关 键 词：Fe-Al/Al_(2)O_(3)涂层 热轧复合 退火热处理 原位氧化 高温氧化行为 

分 类 号：TB31[一般工业技术—材料科学与工程]