In this research the failure of a DIN Ck45-steelclip of a turbofan during the forming process was studied. As the failure was brittle and the forming was done properly, the failure was originated from a problem with raw material. The material and properties like chemical compound, hardness and tensile strength were at the proper ranges. The cold rolled steel passed the heat treatment process like spheroidize annealing and martempering prior using as clips. The problem was related to the slow rate of heating beneath of 850 °C and incomplete microstructure modifying prior to spheroidizing annealing which causes the graphitization in the raw material, and brittle failure during the forming process of parts.

在这项研究中，研究了涡轮风扇的DIN Ck45型钢夹在成形过程中的失效。由于故障很脆，并且成形不当，因此故障源于原材料问题。材料和特性（如化学化合物，硬度和拉伸强度）都在适当的范围内。冷轧钢在用作夹子之前经过了诸如球化退火和回火的热处理工艺。该问题与低于850°C的缓慢加热速度以及在球化退火之前未完成的微观结构改性（这会导致原材料中的石墨化）以及零件成型过程中的脆性破坏有关。