(1. 太原科技大學(xué) 機(jī)械工程學(xué)院，太原 030024；
2. 太原科技大學(xué) 重型機(jī)械教育部工程研究中心，太原 030024)
摘 要: 針對(duì)巴氏合金ZChSnSb11-6工作過(guò)程中的蠕變現(xiàn)象，對(duì)合金進(jìn)行蠕變實(shí)驗(yàn)。基于蠕變實(shí)驗(yàn)所得蠕變曲線，證實(shí)ZChSnSb11-6在實(shí)際工作條件下會(huì)發(fā)生明顯的蠕變現(xiàn)象，同時(shí)利用WDW-E100D試驗(yàn)機(jī)，獲得ZChSnSb11-6蠕變前后的屈服強(qiáng)度等力學(xué)性能。通過(guò)分析合金蠕變、力學(xué)性能和顯微組織之間的關(guān)系，得知蠕變明顯降低ZChSnSb11-6的強(qiáng)度、塑性及抗彈性變形能力，并得到合金蠕變機(jī)理，明確ZChSnSb11-6蠕變變形是應(yīng)變硬化與再結(jié)晶回復(fù)長(zhǎng)時(shí)間交替作用的結(jié)果。通過(guò)計(jì)算合金的應(yīng)變硬化指數(shù)，證實(shí)蠕變使合金均勻變形的能力降低，增大合金發(fā)生斷裂破壞的可能性。同時(shí)，基于硬度試驗(yàn)獲得合金硬度隨溫度變化的計(jì)算公式，確定ZChSnSb11-6的蠕變臨界溫度范圍為50~60℃。通過(guò)觀察ZChSnSb11-6蠕變前后的顯微組織，發(fā)現(xiàn)蠕變使合金組織中SnSb和Cu6Sn5明顯減少，導(dǎo)致合金力學(xué)性能降低。
關(guān)鍵字: 巴氏合金；ZChSnSb11-6；蠕變；力學(xué)性能；顯微組織
（1. College of Mechanical Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China ;
2. Heavy Machinery Engineering Research Center of Education Ministry,
Taiyuan University of Science and Technology, Taiyuan 030024, China）
Abstract:According to the creep phenomenon of Babbitt alloy ZChSnSb11-6 in operation, the creep experiment of ZChSnSb11-6 was carried out. Based on the creep behavior of ZChSnSb11-6, the results validate that such alloy will produce obvious creep during its actual operation. Meanwhile, the mechanical performances, such as yield strength of ZChSnSb11-6 before and after creep, were acquired by using WDW-E100D testing machine. The relationships among creep, mechanical performances and microstructure of alloy were analyzed. The results show that the strength, plasticity and elastic deformation resistance of ZChSnSb11-6 were obviously decreased by creep. What is more, the creep mechanism of ZChSnSb11-6 is obtained, which indicates that the creep deformation of ZChSnSb11-6 is the result of long-time alternative reactions of strain-hardening and recrystallization reply. The strain hardening exponents of ZChSnSb11-6 were calculated. It is verified that the affine deformation capability of alloy decreases. The fracture possibility of alloy increases. At the same time, the calculation formula of alloy hardness change with the temperature is acquired by hardness test of ZChSnSb11-6. The critical temperature of ZChSnSb11-6 creep was determined to be within 50-60 ℃. The microstructure of ZChSnSb11-6 before and after creep was observed. The results show that SnSb and Cu6Sn5 of ZChSnSb11-6 reduce significantly, and the mechanical properties of alloy decrease.
Key words: Babbitt alloy; ZChSnSb11-6; creep; mechanical property; microstructure
