Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第23卷    第z1期    总第1期    2013年12月

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文章编号:1004-0609(2013)S1-0662-05
W对高铌TiAl合金组织和力学性能的影响
韩建超1, 2,徐丽娟1,肖树龙1, 2,陈玉勇1, 2,王致彬3

(1. 哈尔滨工业大学 材料科学与工程学院,哈尔滨 150001;
2. 哈尔滨工业大学 金属精密热加工国家级重点实验室,哈尔滨 150001;
3. 重庆长安汽车股份有限公司,重庆 404100
)

摘 要: 研究分别添加0.3%、0.7%、1.0%W(摩尔分数)对高铌TiAl合金组织和力学性能的影响。结果表明:W的添加不改变合金的凝固路径,不影响合金的室温相组成;随W添加量的增加,合金中Nb和Al的元素偏析程度提高,添加1.0%W时,Al元素偏析明显;W的添加提高TiAl合金的显微硬度,W含量的变化对显微硬度的影响较小;适量的添加W可提高合金的室温压缩强度,添加0.7%W合金的强度达到最大,为1821 MPa,压缩率为24.47%,过量的W(1.0%)将导致合金组织偏析严重,恶化合金的性能。

 

关键字: TiAl合金;钨;显微组织;力学性能

Effect of W addition on microstructure and mechanical properties of high-Nb TiAl alloy
HAN Jian-chao1,2, XU Li-juan1, XIAO Shu-long1,2, CHEN Yu-yong1,2, WANG Zhi-bin3

1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;
2. National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China;
3. Chongqing Changan Automobile Co., Ltd., Chongqing 404100, China

Abstract:The effects of the addition of 0.3%, 0.7%, 1.0%W (mole fraction) on the microstructure and mechanical properties of high-Nb TiAl alloy were studied. The results show that the W alloying doesn’t change the alloy solidification path, has no effect on the room temperature phase composition of high-Nb TiAl alloy. With the increase of W content, the segregation degree of Nb and Al element is enhanced, and the macrosegregation of Al turns striking with 1.0% W addition. Tungsten alloying boosts the microhardness of TiAl alloy, while this boost does not rely on the W content variation. Appropriate W addition can facilitate the room temperature compression strength, the strength achieves maximum value as 1821MPa and the compressibility reaches 24.47% with 0.7% W addition. Nevertheless, excessive W addition (1.0%) will deteriorate the mechanical property owing to severe segregation of Nb, W and Al.

 

Key words: TiAl alloy; W; microstructure; mechanical property

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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