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采用挤压铸造方法,制备了Al2O3颗粒增强20Cr25Ni20复合材料,在650℃下对该复合材料进行抗热震性研究,并且在相同实验条件下和高速钢进行了抗热震性能对比。结果表明:在第15次热震时,Al2O3(p)/20Cr25Ni20复合材料的宏观界面上出现了微小裂纹,并且Al2O3颗粒周围出现了薄氧化层,裂纹沿氧化层进行扩展和延伸;高速钢在第2次热震时就出现了宏观大裂纹。这说明Al2O3(p)/20Cr25Ni20复合材料的抗热震性比高速钢的好。
The Al2O3 particle reinforced 20Cr25Ni20 composite was prepared by extrusion casting method. The thermal shock resistance of the composite was investigated at 650 ℃. The thermal shock resistance of the composite was compared with that of high speed steel under the same experimental conditions. The results show that micro cracks appear on the macro interface of Al2O3 (p) / 20Cr25Ni20 composite material at 15th thermal shock, and thin oxide layer appears around the Al2O3 particles. The crack propagates along the oxide layer. The second macro shock occurred when the macro cracks. This shows that the thermal shock resistance of Al2O3 (p) / 20Cr25Ni20 composite is better than high-speed steel.