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本文研究了一种高粒子含量镍基铸造合金稳态蠕变行为。通过对不同温度(800,850,900℃),不同应力(22,24,28kgf/mm~2)蠕变变形测量,得出稳态蠕变速率表达式分别为: ε_s=8.01×10~(15)exp(-53170/T) ε_s=2.01×10~(18)σ~(9.58) ε_s=1.06×10~2σ~(9.58)exp(-53170/T) 蠕变速率与应力满足乘方关系,应力指数n=9.58;蠕变速率与温度满足指数函数关系,蠕变激活能Qc=445千焦耳/克原子。本文初步探讨了合金稳态蠕变过程的机制。薄膜透射电镜和蠕变过程分析指出,带割阶位错通过间隙原子扩散由位错攀移粒子控制蠕变过程。
This paper studies the steady-state creep behavior of a nickel-based cast alloy with high particle content. The creep strain rates of different temperatures (800,850,900 ℃) and different stresses (22,24,28kgf / mm ~ 2) were obtained and the steady creep rate expressions were obtained as follows: ε_s = 8.01 × 10 ~ 15 exp -53170 / T) ε_s = 2.01 × 10-18 σ ~ 9.58 ε_s = 1.06 × 10 ~ 2σ ~ 9.58 exp (-53170 / T) The creep rate and stress satisfy the power relationship, and the stress index n = 9.58; creep rate and temperature satisfy the exponential function, the creep activation energy Qc = 445 kJ / g atom. In this paper, the mechanism of steady-state creep of alloy is discussed preliminarily. Transmission electron microscopy (TEM) and creep analysis indicate that the dislocation-climbing particles control the creep process by the dislocation-climbing particles.