元素Cr对粉末冶金Ti-6Al-4V合金组织与性能的影响

doi:10.13228/j.boyuan.issn1006-6543.20140006

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摘要采用冷等静压、真空烧结的方法制备不同Cr含量的Ti-6Al-4V合金，通过金相观察、力学性能测试及SEM分析等方法研究Cr元素对Ti-6Al-4V合金显微组织与力学性能的影响。结果表明：添加Cr元素后，合金中并未出现化合物TiCr2，其组织是由(α+β)相组成的魏氏组织。Cr的添加降低了合金的致密度，提高了其抗压强度，当Cr质量分数为4%时，合金的抗压强度达到1 855 MPa。Cr质量分数为1%、2%时，合金断裂形式为韧性断裂；Cr含量为3%、4%时，合金断裂形式为解理断裂。

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关键词 ：关键词：Ti-6Al-4V, 粉末冶金, 微合金化, 微观组织, 力学性能

Abstract：Ti-6Al-4V alloy with different Cr content was prepared by the method of cold isostatic pressing and vacuum sintering. The effect of Cr addition on the microstructure and mechanical properties of Ti-6Al-4V alloy was investigated using optical microscope, mechanical properties testing and scanning electron microscope. The results show that the compound TiCr2 does not appear in the alloy after adding Cr element, and the alloy is composed of (α+β) phase, which belongs to widmanstatten structure. The addition of Cr element makes the relative density of the alloy decrease and the compressive strength increase. The compressive strength of the alloy is 1 855 MPa when Cr content is 4wt%. The fracture mode of alloy is ductile fracture when Cr content is 1wt% and 2wt%; while the fracture mode turns to dissociative fracture when Cr content is 3wt% and 4wt%.

Key words： Keywords：titanium alloys powder metallurgy microalloying microstructure mechanical properties

收稿日期: 2014-01-15 出版日期: 2014-12-18

基金资助:河南省重大科技专项

通讯作者: 徐坚 E-mail: xujian851020@126.com

引用本文:

徐坚，王文焱，张豪胤，谢敬佩，李洛利. 元素Cr对粉末冶金Ti-6Al-4V合金组织与性能的影响[J]. , 2014, 24(06): 11-15.
XU Jian, WANG Wen-yan,, ZHANG Hao-yin, XIE Jing-pei,, LI Luo-li. Effects of Cr addition on microstructure and mechanical properties of powder metallurgy Ti-6Al-4V alloy. , 2014, 24(06): 11-15.

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