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钢制零件在淬火过程中因操作不当,经常会出现各种各样的开裂。下面就我厂的生产经验谈谈碳素钢零件的淬火开裂典型及原因分析。一、零件上沿原始纤维方向出现的开裂 1.实例:图1为直径8毫来,长50毫米的45钢元柱状零件,淬火规范为:840℃加热后水淬冷透。淬火硬度达HRc58～59,形成轴向裂纹。图2 为壁厚12毫米的45钢螺母,淬火规范为:820℃加热,水冷3秒入油,硬度为HRC56以上,内孔形成轴向裂纹。 2.开裂原因分析:零件的热压力加工造成沿纤维方向的强度高,垂直纤维方向的强度较低。所以在淬火应力的作用下,易形成顺纤维方向的开裂。图1、图2所示零件的开裂都是顺纤维方向的,是较典型的淬透开裂。这种
Steel parts in the quenching process due to improper operation, often there will be a variety of cracking. Here I talk about the production experience of carbon steel plant parts quenching cracking typical and analysis. First, the parts along the direction of the original fiber cracking 1. Example: Figure 1 is a diameter of 8 millimeters, 50 millimeters long 45 steel columnar parts, quenching specifications: 840 ℃ water quenching after heating. Quenching hardness of HRc58 ~ 59, the formation of axial cracks. Figure 2 is a wall thickness of 12 mm 45 steel nut, quenching specifications: 820 ℃ heating, water cooling 3 seconds into the oil, the hardness of HRC56 or more, the formation of axial cracks in the hole. 2. Cracking analysis: the parts of the hot pressure processing caused by the fiber along the direction of the high strength, low vertical fiber direction. Therefore, the role of quenching stress, easy to form along the direction of fiber cracking. Figure 1, Figure 2 are cracking the parts along the fiber direction, is more typical of quench cracking. This