热等静压保温温度对TC4合金组织及拉伸性能的影响

通过热等静压近净成形技术制备的TC4合金具有独特的优势,近年来受到大量关注.研究了热等静压保温温度对TC4合金显微组织及拉伸性能的影响.结果表明:120 MPa、2 h保压条件下,保温温度达到800℃时,合金完全致密化;随着保温温度从800℃升高到920℃,合金的抗拉强度从942 MPa降为920 MPa,拉伸应变从1...

The effect of hot isostatic pressing temperature on the microstructure and tensile properties of TC4 alloy

The preparation of TC4 alloy by powder NNS-HIP has received widespread attentions in recent years due to its unique advantages. In this research, effects of hot isostatic pressing temperature on the microstructure and tensile properties of TC4 alloy were systematically investigated. The experimental results show that the alloy is completely densified when the holding temperature reaches 800 ℃ under the holding pressure condition of 120 MPa for 2 hours; As the holding temperature increases from 800 ℃ to 920 ℃, the tensile strength of the alloy decreases from 942 MPa to 920 MPa, and the tensile strain increased from 13.7% to 18.1%; The volume fraction of β phase in the alloy microstructure increases with the rise of the holding temperature, and the distribution of β phase tends to be uniform as a result. The addition in β phase is a key factor for the decline in strength and ascent in plasticity of the alloy.