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)S1-0125-05
碳、硼对铸态ZTC4组织与性能的影响
戚运莲1,曾立英1,侯智敏1,洪 权1,刘时兵2,赵 军2,谢华生2

(1. 西北有色金属研究院,西安 710016;
2. 沈阳铸造研究所,沈阳 110022
)

摘 要: 采用熔铸工艺制备了含硼量为0.2%~0.5%(质量分数)、含碳量为0.5%~2.0%(质量分数)的ZTC4/B/C钛基复合材料,分析并测试了合金的铸态组织和力学性能。研究结果表明:钛硼相提高TC4合金铸棒的弹性模量,硼元素添加量为0.5%时,合金弹性模量提高30%,同时具有较好的强塑性匹配。C元素大大提高ZTC4合金铸棒的强度,添加0.5%C,其抗拉强度达到1 300 MPa,提高了25%。ZTC4合金铸棒的显微组织由片层α或球状α、晶界b及短棒状第二相TiB、球状颗粒且具有浮凸感的第二相TiC组成,B元素具有细化晶粒的作用。

 

关键词: 铸造钛合金;微量元素;弹性模量;显微组织;力学性能

Effects of C and B on microstructure and properties of as-cast ZTC4
QI Yun-lian1, ZENG Li-ying1, HOU Zhi-min1, HONG Quan1, LIU Shi-bing2, ZHAO Jun2, XIE Hua-sheng2

1. Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China;
2. Shenyang Research Institute of Foundry, Shenyang 110022, China

Abstract:ZTC4/B/C titanium matrix composites containing B and C with B content ranging from 0.2% to 0.5% (mass fraction) and C content ranging from 0.5% to 2% (mass fraction) were fabricated using melting-casting process. The microstructure and mechanical properties of as-cast ZTC4/B/C titanium matrix composite were studied.The results indicate that elastic modulus of ZTC4/B is increased by 30% with 0.5%B. The ultimate tensile strength (UST) of ZTC4/B/C reaches 1 300 MPa with 0.5%B and 0.5%C, which is increased by 25%. The microstructures of as-cast ZTC4/B/C consist of lamellar α, grain boundaries β and the second phase TiB with bar-like shape and the second phase TiC with spherical-like shape. The microstructures of ZTC4/B/C can be refined with the increase of B content.

 

Key words: cast titanium alloy; trace element; elastic modulus; microstructure; mechanical properties

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

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

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