毕业设计（论文）探讨脉冲电流对H13热模具钢球化退火组织和性能的影响.doc

河南科技学院
2009届本科毕业论文
论文题目: 探讨脉冲电流对H13热模具钢球化退火组织和性能的影响
Discussion on pulse current impact on the anization and performance of the H13 cold molding tool steel
学生姓名:刘铁权
所在院系:机电学院
所学专业:机电技术教育
导师姓名:王焕琴
完成时间:2009 年 5 月15 日
摘要
H13钢是一种用途广泛的钨系热作模具钢,%左右,属于过共析钢,,硬度,耐磨性,和疲劳强度等性能与碳化物的形态,大小以及分布有关,通常H13钢的常规等温退火处理先是保温,然后炉冷再空冷,退火后的组织为球状珠光体和少量的粒状碳化物,可以获得的硬度为210HBS左右,但该处理工艺周期较长,耗能较多,效率低,而且很难在基体上获得粒度小,分布均匀的碳化物,而采用电脉冲球化退火处理后的H13钢效果比较明显,结果表明,新工艺提高了球化速度,球化时间与常规处理的球化时间相比,大大缩短,而且碳化物颗粒细小均匀,球化效果好,硬度适当,比常规退火处理后的硬度低,组织也分布均匀.
关键词:H13钢,球化退火,碳化物,电脉冲处理
Discussion on pulse current impact on the anization and performance of the H13 cold molding tool steel
Abstract H13 steel is a widely used line of tungsten hot die steel, the carbon content of about %, which had eutectoid steel, the anization and carbide sorbite just .3 Cr2W8V strength, hardness, wear-resistant sexual, and the fatigue performance and carbides, such as shape, size and distribution, often H13 steel conventional isothermal annealing heat first, and then cold and then air-cooled furnace, annealed for anization of granular pearlite and a small amount of carbide, available about 210HBS hardness, but the process cycle is longer, more energy-consuming, inefficient, and very Difficult to obtain in the matrix of small size, carbide distribution, and use of electrical pulses spheroidzing H13 steel treated more obvious effects, results show that the new technology to improve the speed of the ball, the ball time and conventional treatment of the ball pared to significantly reduce, and even small carbide particles, the ball of effective hardness appropriate than the conventional annealing treatment, the hardness of low anizations.
Key words; H13 steel; spheroidizing; carbide; electropulsing.
目录
1 绪论 1
2探讨不同堆放方式脉冲球化退火的H13模具钢组织和性能分析 2
研究H13模具钢球化退火的主要目的 2
H13模具钢的化学成分(%)表1所示: 2
H13模具钢的常规球化退化工艺 2
3 实验原理 3
4 实验准备 4
实验材料 4
实验仪器 5
与脉冲电场发生器连接的放置工件的装置 5
制作SXZ—25—12高温箱式电阻