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采用应力松弛方法研究了2种不同晶粒大小HR3C耐热钢的初始态试样和时效态试样的高温蠕变变形行为,并分析了其微观组织特点.结果表明,尽管2种HR3C耐热钢的化学成分相近,但其蠕变行为有明显差异.相同条件下,晶粒较粗的HR3C耐热钢初始态与时效态的蠕变速率均低于晶粒较细的HR3C耐热钢,具有较高的蠕变抗力.2种HR3C耐热钢经过高温时效处理后,蠕变抗力均明显降低.晶粒较细小的HR3C钢在高温时效后其应力指数(n)与蠕变表观激活能(Q)的降低幅度更加显著,表明晶粒较细的HR3C耐热钢的蠕变抗力的稳定性低于晶粒较粗的HR3C耐热钢.
The high temperature creep deformation behavior of two kinds of HR3C heat-resisting steel samples with different grain sizes and aging samples was studied by stress relaxation method and the microstructure characteristics were analyzed.The results showed that although two kinds of HR3C The chemical composition of steel is similar, but the creep behavior is obviously different.Under the same conditions, the initial and aging creep rates of HR3C heat-resistant steel with the coarse grains are lower than HR3C heat-resistant steel with smaller grain size, With high creep resistance.The HR3C heat-resistant steels showed a significant decrease in creep resistance after being aged at high temperature.The microstructures of HR3C steel with small grain size were obviously affected by their stress exponent (n) and apparent creep The decrease of energy (Q) is more significant, indicating that the stability of creep resistance of HR3C heat-resistant steel with smaller grains is lower than that of HR3C heat-resistant steel with coarse grains.