摘要
采用硬度测试、显微组织观察和能谱分析等手段研究了不同铸造方法对Fe-Cu合金硬度与组织的影响,对比分析了铸态和正火态Fe-Cu合金的切削加工性能并探讨了合理的切削加工参数。结果表明,金属型铸造Fe-Cu合金的硬度最高,耐火砖型铸造FeCu合金的硬度最低;合金铸造时的冷却速度与其硬度呈正影响关系,冷却速度越大则合金硬度越高。金属型铸造Fe-Cu合金中,网状的组织主要分布在晶界处,而断续线状结构组织主要分布在晶粒内部;树脂砂型铸造Fe-Cu合金中,断续线状组织的数量明显减少,晶界处的白色组织从连续状转变为断续状,但是网状壁的厚度增加;耐火砖型铸造Fe-Cu合金中,晶界处的白色组织转变为柱状或者块状。随着冷却速度的逐步降低,Fe-Cu合金基体组织中Fe元素的含量逐渐增加,而Cu的含量逐渐降低;在切削参数相同的条件下,正火态Fe-Cu合金的切削力比铸态Fe-Cu合金的高。
The effects of pouring mode on hardness and microstrueture of Fe-Cu alloy were investigated by means of hardness test, microstruetnre observation and energy spectrum analysis respectively. Comparative analysis of the cutting properties of as-cast and normalized Fe-Cu alloy was carried out, and the proper cutting parameters were discussed. The results show that the Fe-Cu alloy prepared with permanent mold casting has the highest hardness while that casted with refractory brick type mold has the lowest hardness. The cooling rate of the alloy casting is positively related to its hardness, the faster the cooling rate, the higher the hardness of the alloy. In the Fe-Cu alloy prepared with permanent mold casting, the reticular structure is mainly distributed at the grain boundaries, while the intermittent linear structure is mainly distributed in the grain. The amount of intermittent linear structure in the alloy prepared with resin sand casting decreases obviously and the white structure in the grain boundaries turns from continuous to intermittent structure, however, the thickness of the reticular wall increases. In the Fe-Cu alloy prepared with refractory brick easting, the white structure in the grain boundaries changes to columnar or block structure. With the gradual decrease of the cooling rate, the content of Fe element in the matrix of the Fe-Cu alloy increases gradually while the Cu content decreases gradually. Under the same cutting parameters, the normalized Fe-Cu alloy needs larger cutting force than the as-cast Fe-Cu alloy.
出处
《金属热处理》
CAS
CSCD
北大核心
2015年第8期168-173,共6页
Heat Treatment of Metals
基金
国家自然科学基金(50729702)
关键词
Fe-Cu合金
冷却速度
正火
组织
切削力
Fe-Cu alloy
cooling rate
normalizing
microstructure
cutting force
