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蠕變對巴氏合金ZChSnSb11-6力學性能和顯微組織的影響
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更新時間：2015-07-27
針對巴氏合金ZChSnSb11-6工作過程中的蠕變現象，對合金進行蠕變實驗。
蠕變對巴氏合金ZChSnSb11-6力學性能和顯微組織的影響Influence of creep on mechanical properties and
microstructures of Babbitt alloy ZChSnSb11-6
針對巴氏合金ZChSnSb11-6工作過程中的蠕變現象，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生明顯的蠕變現象，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性能。通過分析合金蠕變、力學性能和顯微組織之間的關系，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蠕變變形是應變硬化與再結晶回復長時間交替作用的結果。通過計算合金的應變硬化指數，證實蠕變使合金均勻變形的能力降低，增大合金發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，發現蠕變使合金組織中SnSb和Cu6Sn5明顯減少，導致合金力學性能降低。
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.
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