熱處理對鈦-5鋁-1錫-1鉻-1鐵合金阻尼比的影響

Study of the Effect of heat treatment on damping properties of Ti-5Al-1Sn-1Cr-1Fe alloy

林政宗(Cheng-Tsung Lin)

指導教授 ： 趙志燁

國立屏東科技大學/工學院/機械工程系所/碩士(2012年)

https://doi.org/10.6346/NPUST.2012.00200

摘要

本文主要探討鈦-5鋁-1錫-1鉻-1鐵合金由720℃至1040℃，每隔40℃為熱處理條件，加熱時間為一小時，冷卻方式區分空冷及水冷，測定振動阻尼比，討論與相對應機械性質、金相顯微結構與硬度的關係。
鈦-5鋁-1錫-1鉻-1鐵合金，原板材到960℃，冷卻方式為空冷的機械性質抗拉強度由141 ksi遞減至128.6 ksi；降服強度由122.2ksi遞減至114ksi；延伸率由12.8%遞減至9.2%。1000℃、1040℃抗拉強度為141、140.5ksi；降服強度為61ksi、98.4ksi；延伸率為2%、2.24%。原板材至1040℃全區硬度由HRC 31度遞增至35度，其組距差異不大。1000℃以上α相即轉變為針狀組織，其延伸率偏低，不利球頭打擊面耐凹強度。
720℃到920℃，冷卻方式為水冷的機械性質抗拉強度由137 ksi遞減至131 ksi；降服強度由121ksi遞減至76.8ksi；延伸率由15%遞減至6.8%；硬度介於HRC 30~33度之間。960℃~1000℃抗拉強度為167ksi~159ksi；降服強度為66.1ksi、45.3ksi；延伸率為4%、0.8%；硬度值由HRC43遞增至HRC48。1000℃以上α相即轉變為針狀組織。從880℃起其延伸率從6.8%逐漸降低，不利球頭打擊面耐凹強度。
空冷阻尼比範圍為0.0346%至0.0736%；水冷阻尼比範圍為0.0452%至0.0776%，水冷的阻尼比空冷的還要高。兩種冷卻方式的阻尼比最低點都在720℃，最高值也都在920℃。比較全區溫度金相顯微組織，與阻尼比的相關性低。

關鍵字

鈦合金 ； 顯微結構 ； 阻尼比 ； 振動分析

並列摘要

This paper discusses the Ti -5 Al -1 Sn -1 Cr-1 ferroalloy from 720 ℃ to 1040 ℃ at intervals of 40 ℃ heat treatment conditions, the heating time of one hour, quench method to distinguish between air-cooled and water cooled, determination of the vibration damping and to discuss the corresponding of the relation of mechanical properties, metallographic structure and hardness.
Ti -5 Al -1 Sn -1 Cr-1 ferroalloy, the original material to 960 ℃, cooling for air-cooled mechanical properties of tensile strength of 141 ksi decreasing to 128.6 ksi; the yield strength from 122.2ksi descending to 114ksi; extension rate12.8% down to 9.2%. 1000 ℃, 1040 ℃ tensile strength of 141,140.5 ksi; yield strength 61ksi, 98.4ksi; extension rate of 2%, 2.24%. 920 ℃ in the β phase is observed in the martensite organizations, the region of the original plate to 1040 ℃ hardness of HRC 31 degree increments to 35 degrees, the group from the difference. Above 1000 ℃ α phase transfer into a needle structure, the extension rate lower and it’s not good for the face strength.
720 ℃ to 920 ℃, the cooling method for water-cooled mechanical properties of tensile strength of 137 ksi down to 131 ksi; the yield strength from 121ksi descending to 76.8ksi; extends from 15% down to 6.8%; hardness between HRC 30 ~ 33degrees. 960 ° C to 1000 ° C tensile strength 167ksi ~ 159ksi; yield strength for the 66.1ksi 45.3ksi; extension rate of 4%, 0.8%; hardness value is incremented by HRC43 to HRC48. 920 ℃, 960 ℃ in the β phase is observed martensite organization, and above 1000 ℃ α phase transfer into the needle structure. The elongation rate is gradually reducing at 880 ℃ from 6.8% and It’s detrimental for the resistant concavity strength of face.
The air-quench damping range is 0.0346% to 0.0736%; water-cooled damping ratio range is 0452% to .0776%, water-cooled damping is even higher than air-cooled. The lowest temperature point of the two kinds of quench method are both at 720℃, the highest temperature is at 920℃. Compare the relation of whole area temperature metallographic microstructure with damping ratio rate is low.

並列關鍵字

Titanium alloy ； Microstructure ； Damping ratio ； Analysis of vibration

參考文獻

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