退火温度与Ti、Al元素对14Cr-ODS合金力学性能的影响  

Effects of annealing temperature and minor Al and Ti elements on mechanical properties of 14Cr-ODS alloys

作　　者：龚梦强 周张健[1] 张珂[1] 户赫龙[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《粉末冶金材料科学与工程》2015年第3期356-361,共6页Materials Science and Engineering of Powder Metallurgy

基　　金：国家重点基础研究发展规划(973计划)资助项目(2007CB209801)

摘　　要：采用机械合金化结合热等静压的方法制备分别含有微量元素Ti和Al的2种14Cr-ODS合金,该合金经锻造加工后,分别于1 000、1 150、1 350℃下进行退火处理,测试其抗拉强度和维氏显微硬度,并利用扫描电镜(SEM)与X射线衍射仪(XRD)等进行结构和物相分析,研究退火温度与Ti、Al元素对14Cr-ODS合金力学性能的影响。结果表明:同一合金体系,在1 150℃下退火后的抗拉强度最高;相同退火温度下,含Ti的14Cr-ODS合金抗拉强度较高,而含Al的14Cr-ODS合金伸长率较大,最高达20%以上。14Cr-Al-ODS合金拉伸断口的韧窝较深,14Cr-Ti-ODS合金的韧窝相对较浅。2种合金的显微硬度随退火温度的变化趋势基本一致,当退火温度从1 000℃升高到1 150℃时,显微硬度基本不变,退火温度达到1 350℃时显微硬度明显下降。Two 14Cr-ODS alloys with compositions of Fe-14Cr-2W-0.2Si-0.3Ti-0.35Y2O3 （14Cr-Ti-ODS） and Fe-14Cr- 0.2V-0.2Si-1W-4.5Al-0.35Y2O3 （14Cr-Al-ODS） were prepared by mechanically alloying （MA）, hot isostatic pressing （HIP） and forging. Then the alloys were annealed at 1 000, 1 150 and 1 350 ℃, respectively. And some basic mechanical properties, such as tensile property and Vickers micro-hardness, were measured at room temperature. The effects of annealing temperature and the minor alloying element of Ti and Al on the mechanical property evolution of two kinds of 14Cr-ODS alloys were investigated using X-ray diffraction （XRD） and scanning electronic microscope （SEM）, etc. The results show that both alloys reach the highest tensile strength after annealing at 1150 ℃; the tensile strength of 14Cr-Al-ODS alloy is significantly lower than that of the 14Cr-Ti-ODS alloy at same annealing temperature, while 14Cr-Al-ODS alloy shows much higher total elongations than that of the 14Cr-Ti-ODS alloy, the maximum elongation of 14Cr-Al-ODS alloy is 20%; SEM observations of the fracture surfaces of tensile specimens reveal that the dimples for 14Cr-Al-ODS alloy are deeper than that of 14Cr-Ti-ODS alloy; the Viekers micro-hardness of both alloys maintain high level similar to the value of the original materials after annealing at 1 000 ℃and 1 150 ℃; only after annealing temperature reaches to 1 350 ℃, the hardness of both alloys decrease significantly.

关 键 词：ODS合金 退火 拉伸性能 显微硬度 

分 类 号：TL-341[核科学技术]