H13钢电火花表面强化研究—混粉准干式工作介质条件下Al粉粒度对H13_钢组织与性能的影响毕业论文.doc

天津职业技术师范大学 Tianjin University of Technology and Education 毕 业 论 文 H13钢电火花表面强化研究 —混粉准干式工作介质条件下Al粉粒度对H13钢组织与性能的影响 EDM surface hardening of H13 steel — powder mixed quasi-dry conditions, the working medium Al powder particle size on the microstructure and mechanical properties of H13 steel effect 摘 要 本文采用混粉准干式电火花表面强化技术对H13钢进行了表面强化组织及性能的研究。在实验验过程中，添加粉末粒度为2.3 μm和1.5 μm的Al粉，通过调整电火花表面强化工艺参数组织性能的影响。 .5 μm的Al粉，正极性加工放电参数为20.8 A、50 μs、50 μs时，强化层层组织较（2.3 μm）致密、均匀，显微硬度较高；随着添加粒度增大，强化层的孔隙率增加，显微硬度降低；采用粒度为1.5 μm的粉，显微硬度最高，达到1220 HV，强化层组织也较致密，这是混粉准干式电火花表面强化添加Al较理想的粒度。 关键词：Al粉；粒度；混粉准干式；H13钢ABSTRACT In this paper, quasi-dry powder mixed EDM surface enhancement technology, the H13 steel microstructure and properties of the surface strengthening research. In the experimental test procedure, add the powder particle size of 2.3 μm and 1.5 μm of Al powder by adjusting spark surface hardening process parameters, the use of optical microscopy, scanning electron microscopy and side reinforcing layer surface morphology, combined with the observation status , analysis, microhardness tester right through the strengthening layer surface to detect surface hardening obtained optimal parameters, exploration and research Al powder size on quasi-dry powder mixed EDM surface hardening of H13 steel microstructure and properties. Studies show that the particle size of 1.5 μm of Al powder, a positive polarity discharge machining parameter is 20.8A-50 μs-50 μs, the strengthening layer compared to tissue (2.3 μm) dense, uniform, high hardness; with the addition increase in grain size, the porosity of the reinforcing layer increases the microhardness decreased; using a powder particle size of 1.5 μm, maximum microhardness, to 1220 HV, the reinforcing layer is more dense tissue, which is a dry powder mixed EDM surface quasi-adding Al to enhance the ideal size. Key Words：Al powder; granularity; powder mixed quasi-dry; H13 steel 目 录 1 综述 1 1.1 课题背景 1 1.2 H13钢的研究现状 2 1.2.1 H13钢的成分分析 2 1.2.2 H13钢的特性