BT16鈦合金沉頭螺栓的加工工藝

BT16鈦合金沉頭螺栓的加工工藝Process of BT16 titanium alloy fastener

研究MJ5和MJ6 兩種規格的BT16鈦合金沉頭螺栓顯微組織、流線和顯微硬度，并與直徑為6 mm的該合金絲材的顯微硬度和組織進行對比。研究結果表明：BT16鈦合金螺栓光桿部位顯微硬度與直徑為6 mm的絲材退火狀態下的硬度相當；螺桿部位經受冷擠壓縮徑和螺紋滾制雙重冷變形強化，顯微硬度明顯高于光桿部位的顯微硬度；螺栓顯微組織與絲材退火狀態下的顯微組織一致，進一步證實螺栓是在退火狀態下直接使用的，未經過熱處理強化，BT16鈦合金沉頭螺栓采用一次縮徑的冷變形強化制造工藝。

The microstructure, streamline and microhardness of two different sizes BT16 countersunk head bolts were analyzed, and compared with that of thread of BT16 titanium alloy with diameter of 6 mm. The results show that the micro hardness of shank is similar to that of as-annealing thread with diameter of 6 mm. The micro hardness of screw is obviously higher than that of the shank because of cold deforming strengthen. Microstructure of BT16 bolt is very similar to that of thread in annealing state, which shows that the bolt can be used in annealing state without solution treatment and aging. Streamline and hardness analyses results show that BT16 countersunk head bolts are deformed under cold condition.

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