Monel K-500合金的高温变形行为研究

A study on hot deformation behaviour of alloy Monel K-500

利用Gleeble热模拟试验机对Monel K-500合金进行了不同变形温度、不同变形量的热模拟试验。结果表明,合金变形抗力大,随着温度的升高,合金的流变应力及其最大值降低。随变形量增大,初始再结晶温度和完全再结晶温度均明显降低,当变形量分别为30%、60%、80%时,其初始再结晶的变形温度分别为950、850、800℃左右;其完全动态再结晶的变形温度分别为1 100、1 050和1 000℃左右。当变形温度高于1 100℃,随变形量增大,再结晶晶粒显著细化。根据上述规律制订出了该合金的锻造工艺,所锻造的该合金棒材组织均匀,效果良好。

A thermal simulation test was made at different deformation temperatures and degrees using a Gleeble simulator.The results show that the alloy has a great resistance to deformation and the flow stress and its maximum value decreases with an increase in deformation temperature.With an increase in deformation degree,both the primary recrystallization temperature and the complete recrystallization temperature decrease sharply.When the deformation degree reaches 30%,60% and 80%,the primary recrystallization temperature is about 950℃,850℃,800℃;the complete recrystallization temperature is about 1 100℃,1 050℃ and 1 000℃,respectively.When the deformation temperature is higher than 1 100℃,the deformation degree increases and the recrystal grain is significantly refined.The forging process parameters were eatablished according to the regular pattern mentioned above.The microstructure of the forged bar is uniform and the result is good.