热处理对TA16合金棒材组织和力学性能的影响
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摘要
研究了不同退火温度及冷却方式对TA16合金棒材组织和性能的影响。结果表明:在600～800℃范围内,随着热处理温度的升高,TA16合金棒材中锻造形成的位错不断减少,屈强比降低;当热处理温度为800℃时,位错消失,组织等轴化,完全再结晶同时伴随晶粒长大,在水冷条件下出现一定数量的退火孪晶;孪晶可强化组织,导致塑性降低,屈强比升高;相同热处理温度下,冷速越快,获得组织晶粒越小;当热处理温度在700～750℃时,棒材的综合性能良好,可利于后续管坯制备和后续冷轧生产。
Effects of different heat treatment temperatures and cooling modes on their microstructure and properties of TA16 alloy rods were studied. The results show that with the increase of heat treatment temperature in the range of 600-800 ℃,the dislocation density in the forging of TA16 alloy bars and the ratio of Rp0. 2/Rmboth decrease. When the heat treatment temperature is at 800 ℃,the dislocations disappear and microstructure becomes equiaxed,and is completely recrystallized along grain growth,a certain amount of annealing twin crystals appears with the condition of water cooling. Annealing twins can strengthen the microstructure,which lead to the lower plasticity and the increase of the ratio of Rp0. 2/Rm. Under the same heat treatment temperature,the faster the cooling rate,the smaller the grain size is obtained. Selecting heat treatment temperature in the range of 700-750 ℃,the comprehensive properties of the bar is good,and it can be conducive to subsequent billet preparation and subsequent cold rolling production.
Effects of different heat treatment temperatures and cooling modes on their microstructure and properties of TA16 alloy rods were studied. The results show that with the increase of heat treatment temperature in the range of 600-800 ℃,the dislocation density in the forging of TA16 alloy bars and the ratio of Rp0. 2/Rmboth decrease. When the heat treatment temperature is at 800 ℃,the dislocations disappear and microstructure becomes equiaxed,and is completely recrystallized along grain growth,a certain amount of annealing twin crystals appears with the condition of water cooling. Annealing twins can strengthen the microstructure,which lead to the lower plasticity and the increase of the ratio of Rp0. 2/Rm. Under the same heat treatment temperature,the faster the cooling rate,the smaller the grain size is obtained. Selecting heat treatment temperature in the range of 700-750 ℃,the comprehensive properties of the bar is good,and it can be conducive to subsequent billet preparation and subsequent cold rolling production.
引文
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