Effect of cooling method of heat treatment on microstructure and properties of TC10 titanium alloy

doi:10.13251/j.issn.0254-6051.2022.08.016

Abstract

Abstract: 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.

Key words: TC10 titanium alloy, cooling method, microstructure, mechanical properties

CLC Number:

TG156.1

Zhang Mingyu, Yun Xinbing, Fu Hongwang. Effect of cooling method of heat treatment on microstructure and properties of TC10 titanium alloy[J]. Heat Treatment of Metals, 2022, 47(8): 98-104.

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