700℃短时用高温钛合金的显微组织与力学性能  

Microstructure and Mechanical Properties of a High Temperature Titanium Alloy for Short Term Use at 700℃

作　　者：董大勇[1] 孔凡涛[2] 

机构地区：[1]中国第一重型机械集团公司,黑龙江齐齐哈尔161042 [2]哈尔滨工业大学材料科学与工程学院,黑龙江哈尔滨150001

出　　处：《哈尔滨理工大学学报》2015年第3期78-81,共4页Journal of Harbin University of Science and Technology

基　　金：国家自然科学基金(51471056)

摘　　要：Ti-Al-Sn-Zr-Mo-Si系高温钛合金以其低密度、高强度、高刚度和优异的抗氧化性等特点,在航空航天领域具有广泛的应用前景.采用水冷铜坩埚真空感应熔炼炉(ISM)制备了Ti-Al-SnZr-Mo-Si系高温钛合金铸锭,并采用高温锻造工艺研制出了高温钛合金锻坯.显微组织分析结果表明,锻态高温钛合金为近α型钛合金,显微组织为网篮组织.拉伸力学性能测试结果表明:从室温到700℃,锻态Ti-Al-Sn-Zr-Mo-Si系高温钛合金均展现出优异的力学性能.在700℃的条件下,其抗拉强度仍然可以达到近550MPa,延伸率达到15%.Ti-AI-Sn-Zr-Mo-Nb-W-Si series high temperature titanium alloy have continued to attract so much attention from aerospace applications because of its low density, high strength, high stiffness and good oxidation re- sistance. In this paper, the ingot of Ti-A1-Sn-Zr-Mo-Nb-W-Si series high temperature titanium alloy was prepared by induction skull melting（ISM） in a water cooler copper crucible. The pancake was obtained by hot forging. Mi- crostructures and mechanical properties of the as-forged alloy were also systemically discussed. The results showed that the as-forged alloy is near-α alloy with a basketweave microstructure. From room temperature to 700℃, the as- forged alloy showed excellent mechanical properties. The tensile strength and elongation of the as-forged alloy still can reach nearly 550MPa and 15% at 700℃, respectively.

关 键 词：钛合金 锻造 组织 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]