高速线材轧制工艺对Ti-6Al-4V合金小规格棒材组织与性能的影响
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摘要
采用高速线材轧制制备出准10 mm的Ti-6Al-4V合金小规格棒材,研究了不同轧制工艺对棒材微观组织与力学性能的影响。结果表明:初轧温度为850℃时,棒材组织主要为初生等轴α相和β相,等轴α相出现长大现象,呈短棒状;当温度升高到900℃,棒材组织主要由等轴α和细小β转变组织组成的双态组织;等轴α相逐渐减少,β转变组织不断长大呈片状分布。初轧温度950℃时,棒材的伸长率和断面收缩率下降明显,不能达到标准要求。当初轧温度为900℃时,棒材强度和塑性达到最佳配合,其抗拉强度为938 MPa,屈服强度为866 MPa,伸长率为13.1%,断面收缩率为26.5%。
Small size bars of Ti-6Al-4V alloy(准10mm) were prepared by high-speed wire rolling. The effects of different rolling processes on the microstructure and mechanical properties of the bars were investigated. The results show that, when the initial rolling temperature is 850℃, the microstructure of the bars is mainly composed of the primary equiaxial α phase andβ phase. Meanwhile, the equiaxial α phase grows up and it becomes short stick. When the rolling temperature increases to900℃, the microstructure of the bars is mainly composed of equiaxial α and small transformed β phase, and the equiaxial αphase gradually reduces, while transformed β phase grows up, which is schistose distribution. When the initial rolling temperature is 950℃, the elongation and the reduction of area of the bars decrease significantly, and then the mechanical properties can not satisfy with the standard. When the initial rolling temperature is 900℃, the strength and plasticity of the bar reach the best fit, the tensile strength is 938 MPa, yield strength is 866 MPa, the elongation is 13.1% and the reduction of area is 26.5%.
Small size bars of Ti-6Al-4V alloy(准10mm) were prepared by high-speed wire rolling. The effects of different rolling processes on the microstructure and mechanical properties of the bars were investigated. The results show that, when the initial rolling temperature is 850℃, the microstructure of the bars is mainly composed of the primary equiaxial α phase andβ phase. Meanwhile, the equiaxial α phase grows up and it becomes short stick. When the rolling temperature increases to900℃, the microstructure of the bars is mainly composed of equiaxial α and small transformed β phase, and the equiaxial αphase gradually reduces, while transformed β phase grows up, which is schistose distribution. When the initial rolling temperature is 950℃, the elongation and the reduction of area of the bars decrease significantly, and then the mechanical properties can not satisfy with the standard. When the initial rolling temperature is 900℃, the strength and plasticity of the bar reach the best fit, the tensile strength is 938 MPa, yield strength is 866 MPa, the elongation is 13.1% and the reduction of area is 26.5%.
引文
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[2]金和喜,魏克湘,李建明,等.航空用钛合金研究进展[J].中国有色金属学报,2015(2):280-292.
[3]毛飞龙,帅美荣,秦建平,等.TC4钛合金热力学行为及棒材轧制工艺研究[J].热加工工艺,2014,43(1):48-51.
[4]黄淑阳,陶海林,王建斌,等.轧制工艺对Ti6Al4V钛合金棒材组织和性能的影响[C]//中国有色金属工业协会.2012年钛年会钛锆铪分会.北京:中国有色金属工业协会,2012.
[5]刘世锋,刘全明,张朝晖,等.钛棒线材热连轧生产研究展望[J].热加工工艺,2014,43(3):5-7.
[6]Huang ZY,Wang QY,Wagner D,etal.Averyhighcyclefatigue thermal dissipation investigation for titanium alloy TC4[J].Materials Scienceand Engineering:A,2014,600:153-158.
[7]王岩,陈露.浅谈高速线材生产线轧机安装技术[J].中国新技术新产品,2012(1):160-161.
[8]孙伟.高速线材自动控制系统的设计与优化[D].沈阳:东北大学,2011.
[9]张红菊,张东晖,李璞,等.钛合金相转变点检测方法[J].热加工工艺,2013,42(10):89-92.
[10]徐坚,王文焱,谢敬佩,等.固溶-时效对TC4钛合金组织与性能的影响[J].稀有金属与硬质合金,2014(2):41-44.
[11]刘婉颖,朱毅科,林元华,等.热处理对TC4钛合金显微组织和力学性能的影响[J].材料导报,2013,27(18):108-111.