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本文用衍射仪内标法测定了氧化层的残余应力,研究了稀土元素对Fe-Cr-Al合金在1200℃和1350℃氧化时氧化层残余应力的影响,结果表明,氧化层都存在残余压应力,且稀土元素有明显的影响,不加稀土的A合金σ<100 kgf/mm~2,加(La+Ce)的B合金σ>200kgf/mm~2,加Y的C合金σ>300kgf/mm~2. 若以〔P〕_A=P_(0001)+P_(0118)+P_(1129)+P_(10110)的织构系数值表示氧化层的择优取向的程度,发现氧化层的择优取向程度与粘附性有一定的关系,〔P〕_A>6.5的氧化层不发生剥落,〔P〕_A<6.5的氧化层发生剥落,稀土元素增强氧化层的择优取向程度是它改善氧化层粘附性的原因之一.
In this paper, the residual stress of the oxide layer was measured by the internal standard method of diffractometer. The effect of rare earth elements on the residual stress of the oxide layer at the oxidation of Fe-Cr-Al alloy at 1200 ℃ and 1350 ℃ was studied. The results show that the residual stress Stress, and the rare earth elements have a significant impact, without addition of rare earth A alloy σ <100 kgf / mm ~ 2, plus La alloy B alloy σ> 200kgf / mm ~ 2, plus Y C alloy σ> 300kgf / mm ~ 2. If the value of texture coefficient of [P] _A = P_ (0001) + P_ (0118) + P_ (1129) + P_ (10110) indicates the degree of the preferred orientation of the oxide layer, Degree of orientation and adhesion have a certain relationship, [P] _A> 6.5 oxide layer does not spall, [P] _A <6.5 oxide layer spalling, rare earth elements to enhance the preferred orientation of the oxide layer is it to improve the oxide layer One of the reasons for adhesion.