共查询到19条相似文献,搜索用时 61 毫秒
1.
研究了0.3%~0.9%的Mg对P-Ca黄铜显微组织、力学性能和切削性能的影响。通过对显微组织的观察、力学性能和切削性能的检测发现,Mg的加入抑制了P-Ca黄铜组织中片状金属间化合物的出现,使合金的切削性能得到了很好地改善,而硬度和强度没有明显的变化,伸长率明显提高。但是当Mg含量超过0.6%,合金的伸长率反而会急剧下降。含有0.9%的P和0.2%的Ca的P-Ca黄铜中,添加了0.6%的Mg,可使P-Ca黄铜合金力学性能良好,切削性能与铅黄铜接近。 相似文献
2.
3.
通过熔铸方法,于中频感应炉中制备无铅磷钙黄铜铸锭,利用扫描电镜、电子能谱仪、电子万能试验机及卧式车床等手段,研究磷钙黄铜合金的显微组织和力学、切削及耐脱锌腐蚀性能,并结合切屑的形貌观察,分析金属间化合物对切削性能的改善作用。结果表明:磷、钙显著改变了黄铜的组织与性能,使得磷钙黄铜的组织由α相、β相和分布在晶界上及晶粒内的金属间化合物颗粒组成;无铅磷钙黄铜合金的主要成分(质量分数)为57%~60%Cu、40%Zn、0.7%P、0.5%Ca时,合金显示出优良的综合性能,其抗拉强度为362.7 MPa,伸长率为15.0%,布氏硬度为105.0HB,耐脱锌腐蚀深度为321.9μm,切削性能与铅黄铜HPb59-1相当。 相似文献
4.
5.
6.
HPb59-1铅黄铜是一种应用广泛的合金,但是由于铅具有很大的危害作用,所以选取Bi元素取代铅黄铜中的Pb.研究不同工艺条件下其在黄铜中的行为和对力学性能的影响,以期生产出在价格上和铅黄铜相差不多,而性能上完全可以取代铅黄铜的无铅黄铜.研究发现,Bi在黄铜中呈不规则长条块状或者球状颗粒偏聚在α相的晶界上,不易溶于β相,并且Bi黄铜在性能上完全可以取代铅黄铜. 相似文献
7.
与铅黄铜相比,铋黄铜对人体和环境无害,可代替铅黄铜用于许多工程领域。日本、德国等国家都开发了铋黄铜,并研究了铋黄铜的切削性能、力学性能和耐蚀性能。近年来,我国也开展了铋黄铜的研究工作,研究了不同含铋量黄铜的显微组织、力学性能、耐脱锌腐蚀性能,特别是切削性能。结果表明,铋黄铜的组织主要为α相和β相,铋以单质形式存在于晶界和相界;铋黄铜的切削性能与铅黄铜相近;铋能明显改善黄铜的耐脱锌腐蚀性能。目前,铋黄铜的某些性能尚未完全达到铅黄铜的水平,价格也较昂贵,有待进一步研究。 相似文献
8.
以H65、QSn6.5-1及BZn18-26废料为原料制备环保型无铅硅黄铜,研究了Si含量对硅黄铜组织的影响。结果表明,当合金中Si含量为0.2%~0.6%时,硅黄铜组织主要由占多数的板条状α相和与之相间分布的β相组成,β相的数量随着Si含量的增加而增加;当Si含量为0.8%时,组织以多边形的β相为基体,α相分布在β相的晶内及晶界处;当Si含量为1.0%时,组织由多边形的β相、大量分布在β相中的细小颗粒状及少量块状物质组成。根据摩尔分数推测这些细小颗粒物是Cu5Si+β或Cu2Mg+β的复合相,并且随着Si含量的增加,细小颗粒状物的数量也明显增多。 相似文献
9.
10.
11.
A new environmental friendly cutting brass containing stibium instead of lead was produced by casting and rolling. The microstructure was observed and the mechanical, dezincification and cutting properties were studied. The results show that the white particles distribute in both grains and grain boundaries, and the particles are mainly intermetallics containing stibium. The tensile strength, yield strength and elongation percentage of half-hard Sb-brass is 461.72 MPa, 213.3 MPa and 15.67%, respectively. Corresponding to HPb59-1 by the size as well as appearance of the chips and the mechanism of free-cutting, the cutting property of unleaded free-cutting Sb-brass is excellent. The unleaded Sb-brass has excellent dezincification corrosion resistance, and the average depth of longitudinal section is about 295.4 μm, while the average depth of lateral section is about 214.7 μm, and it is feasible to develop a new unleaded free-cutting Sb-brass. 相似文献
12.
1 INTRODUCTIONLead-brass has excellent cutting ability , me-chanical and physical properties and is one of themost widely used copper alloys . The occupationratio of brass tube to all kinds of tubes reaches90 % in developed countries . The cutting lead-brass is a dual-phase brass and fine lead particlesdistribute dispersivelyin grains and on grain boun-ries . Theleadin wasted brass can easily beleachedand dissolvedinto soil .If the wasted lead-brass isburned in air ,the lead will become p… 相似文献
13.
铸态铅黄铜动态再结晶模型的建立 总被引:1,自引:0,他引:1
在Sellars基本模型的基础上,通过对实验数据进行回归,建立了铸态铅黄铜动态再结晶模型;用De-form3D软件模拟的结果与实验所测的数据相吻合。采用Gleeble-1500热模拟试验机进行压缩试验,试验条件为应变速率0.0002/s~0.005/s,变形温度540℃~660℃,应变0.1~1.2,初始晶粒尺寸38μm。 相似文献
14.
Dissimilar metal joining between 5A02 aluminum alloy and H62 brass sheets was conducted by gas tungsten arc welding with Zn-15% Al and Al-12% Si flux-cored filler wires. The microstructure in the weld and distribution of major alloying elements in the intelfacial layer were examined, and the tensile strength of the resultant joints was measured. Pores appeared in the weld made with Zn-15% Al flax-cored filler wire, the interracial layer mainly consisted of AlCu phase, and the specimens fractured through the weld with tensile strength of 129 MPa. When Al-12% Si flux-cored filler wire was used, Cu diffused into the weld and Al2 Cu phase formed, and the specimens fractured along the interfacial layer with tensile strength of 122 MPa. 相似文献
15.
16.
17.
在用球铁生产曲轴的过程中,采用冲天炉保温炉双联熔炼,严格控制原铁液含硫量≤0.020%t同时在铁液中加入不同量的Cu—Mg型球化剂,进行球化孕育处理后,从本体取样研究残留稀土对曲轴金相组织和力学性能的影响。结果表明:随着残留稀土的增加,曲轴的球化级别逐渐变差、抗拉强度和延伸率也逐渐降低。 相似文献
18.