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文章通过采用Gleeble1500热模拟机进行真空扩散连接试验,研究了氢对多孔Ti6Al4V合金扩散连接质量的影响,并应用光学显微镜、扫描电镜(Scanning electron microscope,SEM)及电子万能试验机对界面孔洞弥合率、界面组织形貌、抗弯强度和断口形貌进行分析。结果表明,真空扩散连接后的孔洞弥合率随着原始氢含量的增加而升高,但升高的趋势逐渐平缓;扩散连接后,原始氢含量较低的试样室温组织为α+片状(α+β),原始氢含量高的试样室温组织为条状α+等轴状(α+β);室温下,在一定的氢含量范围内,氢元素在多孔合金中以间隙固溶和氢化物状态存在,均起到了强化作用,使扩散连接后材料抗弯强度增加;随着剩余氢含量的增加,断口由韧性沿晶断裂逐渐转变为脆性沿晶断裂和解理型穿晶断裂两种断裂方式的混合,并且随着氢含量增加,穿晶解理断裂特征增多。
The effects of hydrogen on the diffusion bonding of porous Ti6Al4V alloy were studied by using Gleeble1500 thermal simulator in vacuum diffusion bonding experiment. The effects of hydrogen on the diffusion bonding of porous Ti6Al4V alloy were studied by using optical microscope, scanning electron microscope (SEM) and electronic universal testing machine , Interface morphology, flexural strength and fracture morphology were analyzed. The results show that the rate of occlusion of holes after vacuum diffusion connection increases with the increase of original hydrogen content, but the trend of increase gradually becomes smooth. After diffusion bonding, the samples with lower initial hydrogen content are α + α + β). The samples with high initial hydrogen content were organized in the form of α + equiaxed at room temperature (α + β). At room temperature, hydrogen was dissolved in interstitial solution within the range of hydrogen content The presence of hydrides, all play a strengthening role, so that after diffusion connection, the bending strength of the material increases; with the increase of residual hydrogen content, the fracture gradually changes from ductile fracture along with intergranular fracture to transgranular fracture and cleavage type transgranular fracture Fracture mode of mixing, and as the hydrogen content increases, transgranular cleavage fracture characteristics increase.