The various types of automobile steering knuckles produced by a factory have an annual output of more than 1 million. The safety and reliability of each knuckle is closely related to the quality of heat treatment. In the past, during the knuckle heat treatment process, it was often found that some knuckles used standard oil medium, the quenching hardness was low, and the metallographic examination of the tempering structure was not carried out at the required level (surface layer 1 to 4, heart tissue 5 to 6). level). Because the cooling ability of the oil is difficult to meet the hardening requirements, the use of aqueous medium quenching is prone to cracks. Through market research, the plant uses PQAT water-based polymer quenching agent developed by Nanjing Zhoulian Technology Research Institute as the mother liquor for the preparation of quenching medium. The use of water-soluble medium instead of oil medium quenching, the key is to prevent the occurrence of quenching cracks, the selection of concentration (mass fraction) of 10% of water-soluble medium quenching can meet the requirements of use.
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The results show that a large number of acicular and massive ferrites are produced by quenching with oil medium. However, the quenched bundles of water-soluble medium show obvious needle-like and massive iron bodies, and the microstructure level is obviously better than oil quenching parts, which meets the requirements.