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u0t1GUrBtFK04Cr_9Si_2船用柴油机排气阀抗热腐蚀性能水利论文rU~7{c s] _

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【摘要】:为了解船用柴油机排气阀材料4Cr9Si2的抗热腐蚀性能,用金相显微镜、电子探针和能谱对其腐蚀进行分析.结果表明,4Cr9Si2在500~800℃的抗热腐蚀性能低于1Cr18Ni9,合金中足够的铬含量可以在腐蚀孕育期使合金表面形成致密连续的保护性氧化膜,从而改善合金的热腐蚀性能.镍可以在热腐蚀的加速扩展期起固定硫的作用,从而减缓、延迟了硫向合金基体内的扩散,提高合金的热腐蚀抗力.水利论文~q4z-So |@+{ U

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+j v)gTe$eI0船用柴油机 金属材料 排气阀 热腐蚀性能

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【分类号】:U664.121水利论文2Q RTd"T2rh1~


【正文快照】:水利论文"f*N7y${s4z!dh RZ9O

w4_)mUAib00引言船用柴油机排气阀在运行过程中承受较大的机械负荷和热负荷,运行条件十分苛刻.一方面,极高的气体爆发压力及落座时的撞击使排气阀受到冲击性交变载荷,导致其密封面产生塑性变形和磨损;另一方面,排气阀底面直接与流速超过800 m/s的高温高压燃气接触,瞬间温度可达900~1000水利论文k G)S!Ll3j |

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