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Φ18 mm规格轴承钢盘条GCr15-Y在用户冷镦套圈毛坯时出现开裂,对开裂样品进行低倍、硬度、碳化物、断口、晶粒度等检测,发现断口存在过热组织,且套圈外壁晶粒度明显比基体晶粒度要粗,认为与原始盘条加热工艺即钢坯在加热过程中局部过热有关。在后续GCr15-Y生产过程中,通过对轴承钢坯料入炉位置进行优化、降低加热温度、控制高温段加热时间等措施控制原始盘条不产生过热组织,用户冷镦套圈未再出现开裂现象。
Φ18 mm Specifications Bearing steel wire rod GCr15-Y Crack in the user when the cold heading blank ring, crack samples for low magnification, hardness, carbide, fracture, grain size and other tests found that the fracture exists overheating and ferrule The grain size of the outer wall is obviously larger than the grain size of the matrix, which is considered to be related to the local overheating of the billet during heating in the original wire rod heating process. In the subsequent GCr15-Y production process, the control of the original wire rod did not produce overheating structure through the optimization of the position of the bearing steel billet into the furnace, lowering the heating temperature and controlling the heating time of the high-temperature section, and the user did not re-crack the ring .