被检钢材直径80毫米。经1∶1的盐酸水溶液热蚀——加热至65～70℃,保持25′～30′。在宏观组织中可见图1中箭头所指的阴影。将试样切开(切的方向与阴影相垂直)检查,阴影为严重的碳化物偏析(图2)。碳化物偏析带宽0.36毫米贯穿整个试样厚度。将试样经1272℃、2′40″淬火,试样纵剖面的金相组 Inspected steel diameter of 80 mm. After 1: 1 hydrochloric acid aqueous solution heat - heated to 65 ~ 70 ℃, maintaining 25 ’~ 30’. In the macroscopic organization, we can see the shadow indicated by the arrow in Figure 1. The specimen was cut (perpendicular to the direction of the cut) and shaded as severe carbide segregation (Figure 2). Carbide segregation bandwidth 0.36 mm throughout the thickness of the sample. The sample was 1272 ℃, 2’40 "quenching, the sample longitudinal section of the metallographic group