比较研究了三种腐蚀方法对图像仪测定低碳低合金高强钢焊接相晶区M—A相的适用性。分析了误差来源,讨论了误差修正方法。 The suitability of three kinds of etching methods for the determination of M-A phase in the low-carbon, low-alloy and high-strength steel welding phase region by using imager was studied comparatively. The source of error is analyzed and the error correction method is discussed.