Growing concerns over the hazardous impact of mineral oil-based industrial quench media on human health and the environment have forced researchers to seek renewable and non-hazardous alternatives. Non-edible vegetable oil-based quench media are perceived to be a potential replacement for mineral-based industrial quench media. The present work focuses on assessing the cooling performance of neem oil as compared to commercial hot oil quench media. Inconel and steel probes were used to characterize the cooling performance of these quench media maintained at bath temperatures 100 °C, 150 °C and 200 °C. The heat extraction rates and uniformity of heat extraction in Inconel probes quenched in neem oil were observed to be substantially higher at all bath temperatures. The hardness of AISI 52100 steel probe quenched in neem oil at all bath temperatures was observed to be higher. The pearlitic microstructure was observed in the steel probe quenched in hot oil maintained at 200 °C bath temperature. In contrast to this, a mixture of bainite, martensite and carbide was observed in case of steel probes quenched in neem oil maintained at 200 °C. Oxidation experiments revealed that neem oil is susceptible to an increase in viscosity due to oxidation. An increase in the viscosity by about 15% was observed in the case of neem oil as compared to only 4% increase in viscosity of hot oil. However, after an initial increase, the viscosity of neem oil stabilized and further no significant change in viscosity due to oxidation were observed. Oxidation had no significant effect on the cooling performance hot neem oil quench medium, and thus, it can be considered as an effective replacement for hot oil.

人们越来越关注基于矿物油的工业淬火介质对人体健康和环境的危害，这迫使研究人员寻求可再生且无害的替代品。不可食用的基于植物油的淬火介质被认为可以替代基于矿物的工业淬火介质。本工作着重于评估印度em树油与商用热油淬火介质的冷却性能。铬镍铁合金和钢探针用于表征在浴温100°C，150°C和200°C下保持的这些淬火介质的冷却性能。在印bath油中淬火的Inconel探针中，在所有浴温下，其热提取速率和热提取均匀性均显着提高。在所有浴温下，在印em油中淬火的AISI 52100钢探针的硬度均较高。在保持在200°C浴温的热油中淬火的钢探针中观察到珠光体的微观结构。与此相反，在钢探针在保持于200°C的印度em油中淬火的情况下，观察到贝氏体，马氏体和碳化物的混合物。氧化实验表明印ne油易于因氧化而增加粘度。在印em油的情况下，粘度增加了约15％，而热油的粘度仅增加了4％。然而，在初始增加之后，印ne油的粘度稳定并且进一步没有观察到由于氧化引起的粘度的显着变化。