论文部分内容阅读
本厂原用10号和20号机油混合后作为40Cr钢等工件的淬火介质。在长期使用后,油质灰分增多,粘度增大,冷却能力变差。40Cr齿坯淬火后的硬度在HRC20～30之间,不能满足技术要求,后来试用羟乙基纤维素水溶性淬火介质,取得了满意的效果。 1.试验与结果我们选择无毒、不燃烧的羟乙基纤维素(HEC,参见《金属热处理》1982·4),配制水溶液,进行了以下试验。 (1)淬火试验用40Cr钢φ30×60mm试样,在12kW箱式炉中850±10℃×20min加热,然后在不同冷却介质中淬火,试样从中间切开,分别测表面至中心的硬度(见图1)。可以看出,调节HEC及添加物的含量,所得的硬度曲线随之变动,其中0.45%HEC+3%NaCl+1%NaNO_2淬火液的淬火硬度曲线接近油,且心部硬度比油淬者高。
The original factory with 10 and 20 mixed oil as 40Cr steel and other parts of the quenching medium. After long-term use, the ash content increases, the viscosity increases, and the cooling ability deteriorates. 40Cr gear quenching hardness between HRC20 ~ 30, can not meet the technical requirements, and later test hydroxyethyl cellulose water-soluble quenching medium, and achieved satisfactory results. 1. EXPERIMENT AND RESULTS We selected the non-toxic, non-flammable hydroxyethylcellulose (HEC, see Metals Heat Treatment 1982.4) to make aqueous solutions and tested the following. (1) Quenching test 40Cr steel φ30 × 60mm sample heated in a 12kW box furnace 850 ± 10 ℃ × 20min, and then quenched in different cooling medium, the specimen cut from the middle, respectively, measured from the surface to the center of the hardness (see picture 1). It can be seen that the hardness curve of HEC and additive changes with the increase of HEC content. The quenching hardness curve of 0.45% HEC + 3% NaCl + 1% NaNO 2 quenching fluid is close to that of oil, and the hardness of core is higher than that of oil quenching .