Method for processing metastable beta-type titanium alloy plate

一种亚稳定β型钛合金板材加工方法

Abstract

The invention relates to a method for processing a metastable beta-type titanium alloy plate and belongs to the technical field of titanium alloy processing. The invention aims to overcome defects in the prior art, provides technology for processing a Ti-15-3 alloy plate and improves the cold working performance of alloy. The method for processing the metastable beta-type titanium alloy plate comprises the following steps of: smelting the titanium alloy plate into an ingot, charging at the temperature of between 800 and 850 DEG C and keeping the temperature for 100 to 150 minutes, raising the temperature to between 1,100 and 1,150 DEG C and keeping the temperature for 240 to 360 minutes, and finishing the first fire by repeatedly upsetting and drawing; drawing unidirectionally until cogging is finished so as to obtain a blank; sawing and rolling the plate blank into a hot-rolled plate blank with the thickness of 4 to 10 mm at the temperature of between 850 and 1,000 DEG C; and cold rolling to obtain a plate with the thickness of 1 to 3 mm after annealing and alkaline and acid washing. By controlling the rolling temperature, the deformation degree and the cooling speed after deformation, the method controls the structure of a forging stock to fully break the forging stock, and effectively suppresses phase precipitation resulting in a brittle alloy. Therefore, the cold working plasticity and cold working performance are improved.
本发明涉及一种亚稳定β型钛合金板材加工方法,属于钛合金加工技术领域。本发明的目的在于克服现有技术不足,提供一种Ti-15-3合金板材的加工工艺,提高合金的冷加工性能。本发明亚稳定β型钛合金板材加工方法包括以下步骤:熔炼成铸锭后在800℃~850℃装炉并保温100-150分钟,然后升温至1100℃~1150℃后保温240~360分钟,经过多次镦拔后完成第一火;然后经过单向拔长至开坯完成得到坯料;锯切成板坯在850℃~1000℃温度下进行轧制成4mm~10mm厚的热轧板坯;退火、碱酸洗后进行冷轧至厚度为1-3mm的板材。本发明通过控制轧制温度,变形程度,变形后的冷却速度,控制锻坯的组织,使之充分破碎,有效抑制致使合金变脆的相析出,从而提高冷加工塑性和冷加工性能。

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