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观察了奥氏体氮碳共渗后试样表面的疏松形态,分析了气氛及钢的成分对疏松的影响。发现疏松程度与气氛的氧势有很好的对应关系;且疏松深度及特征与内氧化深度、氧化物密度、尺寸及形态相吻合。对传统的疏松形成机理——氮分子聚合理论提出了补充,认为内氧化物为疏松形成提供了有利的外来核心,氮原子析出和聚合使疏松逐渐长大。内应力为疏松形成提供了附加的驱动力。
The loose morphology of the sample surface after austenitizing nitrocarburizing was observed, and the influence of the atmosphere and the composition of the steel on the porosity was analyzed. It is found that there is a good correspondence between the degree of looseness and the oxygen potential of the atmosphere; and the depth and characteristics of the looseness are consistent with the internal oxidation depth, the oxide density, the size and the morphology. The traditional loose formation mechanism - nitrogen molecular polymerization theory is proposed to supplement, that the formation of oxide within the oxide provides a favorable external core, precipitation and aggregation of nitrogen to loose gradually grow. Internal stress provides additional driving force for loose formation.