摘要
研究了一种无钴镍基铸造高温合金K46的高温拉伸、蠕变和持久性能,并与K412合金进行了比较。结果表明,K46合金的高温拉伸和高温持久强度均高于K412合金,但前者成本低于后者。K46合金在950℃高温下仍具有强度和塑性,足以保证K46合金的安全使用。K46合金的高温拉伸蠕变曲线表现出非常长的稳态蠕变阶段,而较高的蠕变塑性来自于加速蠕变阶段。K46合金的蠕变机制受位错通过γ′沉淀相的攀移过程所控制。K46合金的拉伸、蠕变和持久断裂都表现出沿晶(枝晶间)特征。
The tensile, creep and stress-rupture properties at high temperature of a cast nickel-base superalloy K46 without cobalt, as comparison with superalloy K412, were investigated. The results show that the tensile and stress-rupture strength at high temperature of alloy K46 are higher than that of alloy K412, but the cost of the former is lower than the latter. At 950℃, the alloy K46, usually being worked under 800℃, has enough strength and ductility to safety use. It is found that the creep curves of alloy K46 consist mainly of a longer steady-state creep stage and an accelerated creep stage, which occupies the most creep strain. It is thought that the creep deformation mechanism of alloy K46 is controlled by the dislocation climb around the γ′particles. It is observed that the tensile, creep and stress-rupture fracture process have the intergranular characteristics.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2004年第5期12-15,39,共5页
Journal of Materials Engineering
关键词
铸造镍基高温合金
成本
高温力学行为
cast nickel-base superalloy
cost
high temperature mechanical behavior
