Cr9Mo和Cr5Mo钢的等温氧化行为

对铸态和锻态的Ｃｒ９Ｍｏ和Ｃｒ５Ｍｏ钢分别在７００℃、８００℃和９００℃下进行了为时５００ｈ的氧化试验。结果表明，在７００℃、８００℃下Ｃｒ９Ｍｏ的抗氧化性能比Ｃｒ５Ｍｏ的优越得多，而在９００℃下则相差不多。两种钢的抗氧化性能的差别主要是其表面氧化物性质不同所致。铸态和锻态抗氧化性能的差别则是由于其合金元素分布的均匀度不同，致使氧化物结构有差异造成的。

Isothermal Oxidation Behavior of Cr9Mo and Cr5Mo Steels

Isothermal oxidation test of Cr9Mo and Cr5Mo were carried out at 700℃、800℃and 900℃,with a holding time of 500 h. The results show that the oxidation resistance of Cr9Mo steel is super to that of Cr5Mo Steel at 700℃ and 800℃,but is almost the same as that of Cr5Mo Steel at 900℃. The difference of oxidation resistance between Cr9Mo and Cr5Mo is ascribed to the different properties of oxides formed on the surface, the difference between cast state and forged state to the different structures of the oxides which result from the inhomogeneous distribution of the alloying elements.