置氢对Ti6Al4V合金室温组织的影响  

Influences of hydrogenation on room temperature microstructure of Ti6Al4V alloy

作　　者：苏彦庆[1] 骆良顺[1] 毕维升[1] 丁宏升[1] 郭景杰[1] 贾均[1] 傅恒志[1] 

机构地区：[1]哈尔滨工业大学金属精密热加工国家级重点实验室,黑龙江哈尔滨150001

出　　处：《材料科学与工艺》2005年第1期103-107,共5页Materials Science and Technology

摘　　要：通过在钛合金中引入临时元素氢,可以改变钛合金的相组成,进而改变钛合金的力学性能和加工性能.利用OP、XRD和TEM研究了固态置氢后Ti6Al4V合金的微观组织变化.研究表明:随氢含量的增加,合金中的β相含量增加,在置氢0.302%及0.490%(质量分数)的试样中发现面心立方(fcc)的氢化物δ,及大量的斜方结构的马氏体α",未发现亚稳态的氢化物γ.提出了一种基于扩散的由βH共析转变生成α及fcc结构的片状氢化物δ的机制,并指出氢的引入可能诱发马氏体转变.Hydrogen is usually used as a temporary component to adjust the mechanical properties and the processing abilities of titanium alloys through modifying the microstructure. The paper investigated the microstruc-ture of Ti6Al4V alloy after hydrogenation at solid state by OP、XRD and TEM. It was shown that the content of β phase increases with hydrogen. There are δ titanium hydride ( fcc structure, a=0. 444 nm) plates precipitated in the specimens containing hydrogen 0. 302wt% and 0. 490wt% . Simultaneously, a mass of orthorhom-bic martensite α' has been found in the specimens containing hydrogen 0. 302wt% and 0. 490wt% as well as δ hydride. However, metastable titanium hydride γ( fct structure, c/a = 1.02/1.09) has not been found. This paper presents one eutectoid transformation mechanism from βH to δ hydride and α based on diffusion transformation theory. The martensite transformation induced by hydrogen has also been discussed.

关 键 词：钛合金 马氏体转变 面心立方 微观组织 相含量 氢化物 相组成 改变 临时 诱发 

分 类 号：TB383[一般工业技术—材料科学与工程] TG146[金属学及工艺—金属材料]