硝盐淬火介质的冷却特性  

Cooling characteristics of nitrate quenching medium

作　　者：张峦[1] 顾敏[1] 王爱香[1] 李宝奎[1] 苏兴武[1] 

机构地区：[1]郑州机械研究所,河南郑州450001

出　　处：《金属热处理》2015年第6期212-215,共4页Heat Treatment of Metals

摘　　要：研究了含水量、搅拌速度和盐浴温度对55%KNO3+45%NaNO2硝盐介质冷却特性的影响。采用标准镍合金探头,测定了硝盐介质的冷却曲线。结果表明,随着含水量增大,介质在高温和低温阶段冷却速度均增大;搅拌速度主要对低温阶段的冷却速度有影响,提高搅拌速度,低温冷速随之增大;提高盐浴温度,对硝盐介质冷却能力影响不大,但使探头温度从850℃冷却至200℃的时间明显延长;含水量对硝盐介质冷却能力影响最为显著,其次是搅拌速度,最后是盐浴温度。Effects of water content,agitation speed and nitrate bath temperature on the cooling characteristics of 55% KNO3+ 45% NaNO2 nitrate quenching media were studied. Cooling curves of nitrate quenching media were measured with the Inconel 600 probe. The results show that the cooling rate of nitrate quenching media increases both in high and low temperature with the increase of water content. The cooling rate at low temperature increases by growth of agitation speed which mainly affect the cooling rate of low temperature stage. The nitrate bath temperature has a little influence on cooling characteristics,however,the cooling time of probe from 850 ℃ to 200 ℃ prolonges obviously with the increase of nitrate bath temperature. Moreover,the water content has the most significant influence on the cooling capacity of nitrate quenching media,the agitation speed take second place,and the bath temperature is the weakest factor.

关 键 词：55%KNO3+45%NaNO2硝盐介质 含水量 搅拌速度 盐浴温度 冷却特性 

分 类 号：TG154.4[金属学及工艺—热处理]