摘要
对不同温度加热后的TC10钛合金棒材进行水冷、空冷、炉冷3种不同冷却方式的处理,通过光学显微镜、扫描电镜以及拉伸性能和冲击性能试验,研究了合金在不同冷却方式下的组织和力学性能。结果表明,TC10钛合金锻棒原始组织中α相有两种形态,一种为初生等轴α相,另一种为次生α相。当加热温度低于相变点时,形成的组织以双态组织和等轴组织为主,当加热温度高于相变点时,合金组织以全片层β转变组织和粗片层β转变组织为主。3种冷却方式下,水冷后合金的强度最大,炉冷后合金塑性最好。合金在炉冷后的冲击性能最高,其次为空冷、水冷。当加热温度在两相区时,3种冷却方式下合金的拉伸和冲击断口形貌包含韧窝和解理面,高低起伏明显;当加热温度在单相区时,合金的拉伸断口形貌为结晶状,撕裂棱明显,冲击断口具有晶间断裂特征。
TC10 titanium alloy bars heated at different temperatures were treated with three different cooling methods of water cooling, air cooling and furnace cooling, and the microstructure and mechanical properties of the alloy under different cooling methods were studied by means of metallographic microscope, scanning electron microscope, tensile properties and impact property tests. The results show that there are two forms of α phase in the original microstructure of TC10 titanium alloy forging rods, one is primary equiaxed α phase, and the other is secondary α phase. When the heating temperature is lower than the phase transformation point, the formed microstructure is mainly composed of dual-state structure and equiaxed structure. When the temperature is higher than the phase transformation point, the alloy microstructure is mainly composed of full-lamellar β-transformation structure and coarse-lamellar β-transformation structure. Under the three cooling methods, the strength of the alloy after water cooling is the highest, the alloy has the best plasticity after furnace cooling. The alloy has the highest impact property after furnace cooling, followed by air cooling and water cooling. When the heating temperature is in the two-phase zone, the tensile and impact fracture morphologies of the alloy under the three cooling methods include dimples and cleavage planes, with obvious fluctuation. When the heating temperature is in the single-phase zone, the tensile fracture morphology is intergranular, the tearing edge is obvious, and the impact fracture has the characteristics of intergranular fracture.
作者
张明玉
运新兵
伏洪旺
Zhang Mingyu;Yun Xinbing;Fu Hongwang(Engineering Research Center of Continuous Extrusion,Ministry of Education,Dalian Jiaotong University,Dalian Liaoning 116028,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2022年第8期98-105,共8页
Heat Treatment of Metals
基金
国家自然科学基金(51675074)
辽宁省教育厅项目(JDL2019001)
大连市科技创新基金(2018J11CY027)。
关键词
TC10钛合金
冷却方式
显微组织
力学性能
TC10 titanium alloy
cooling method
microstructure
mechanical properties
