(1. 太原科技大學(xué) 機械工程學(xué)院，太原 030024；
2. 太原科技大學(xué) 重型機械教育部工程研究中心，太原 030024)
摘 要: 針對巴氏合金ZChSnSb11-6工作過程中的蠕變現(xiàn)象，對合金進行蠕變實驗。基于蠕變實驗所得蠕變曲線，證實ZChSnSb11-6在實際工作條件下會發(fā)生明顯的蠕變現(xiàn)象，同時利用WDW-E100D試驗機，獲得ZChSnSb11-6蠕變前后的屈服強度等力學(xué)性能。通過分析合金蠕變、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的強度、塑性及抗彈性變形能力，并得到合金蠕變機理，明確ZChSnSb11-6蠕變變形是應(yīng)變硬化與再結(jié)晶回復(fù)長時間交替作用的結(jié)果。通過計算合金的應(yīng)變硬化指數(shù)，證實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，基于硬度試驗獲得合金硬度隨溫度變化的計算公式，確定ZChSnSb11-6的蠕變臨界溫度范圍為50~60℃。通過觀察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
