正交试验法在无铅黄铜成分设计中的应用

用正交试验法研究了无铅黄铜制备过程中合金元素Sb、Ce和Ti对合金抗拉强度、抗脱锌性能以及切削性能的影响.通过正交试验法得出最优化合金成分为wCu∶wZn∶wSb∶wCe∶wTi=58∶40.5∶0.8∶0.4∶0.3;锑的质量分数是影响合金综合性能的主要因素,其次是Ce含量,Ti影响很小;优化后制备出的合金抗拉强度为461.7MPa,屈服强度为213.3 MPa,延伸率为15.67%,合金平均脱锌层厚度约为255.05μm,合金切削性能较好.     

Microstructure and properties of unleaded free-cutting brass containing stibium

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.     

锑黄铜组织与性能的研究

采用熔铸、轧制的方法生产出了以锑代铅的环保型无铅易切削黄铜板材。通过SEM、OM对锑黄铜的微观组织进行了分析,并对其力学性能进行了研究。结果表明,锑主要以金属间化合物存在于β相以及α和β相的相界处;主要力学性能与HPb59-1铅黄铜相当,锑黄铜的抗拉强度为461.72Mpa,屈服强度为213.3MPa,伸长率为15.67％。研制的锑黄铜替代铅黄铜,具有可行性。     

无铅锑黄铜轧制工艺的研究EI北大核心

在研究锑黄铜板材熔铸工艺的基础上,通过控制开坯温度、压下制度、轧制温度和退火制度,轧制出抗拉强度达到461.7MPa,延伸率可达15.67%,力学性能与铅黄铜HPb59-1相当的锑黄铜,为进一步提高无铅易切削锑黄铜的热轧提供了参考。     

Al、Ce对易切削铋黄铜组织和性能的影响

研制了一种性能优异的易切削铋黄铜来替代有毒的铅黄铜.为了改善铋黄铜的力学性能,在铋黄铜中添加了一定量的Al和Ce.采用光学显微镜、扫描电镜和X-衍射仪来分析铋黄铜的微观组织.分析可知,合金的组织细小,Bi均匀分布在基体中.与传统的铅黄铜比较,所研究的无铅铋黄铜具有优异的切削性能.合金的抗拉强度高于450 MPa,伸长率高于35%.Al和Ce主要通过影响Bi在合金中的润湿效应,改变Bi在合金中的分布,从而对铋黄铜组织和性能产生影响.     

铋对无铅易切削黄铜性能的影响

考察了0.3～0.9%的铋对无铅铋黄铜合金力学性能、切削性能的影响.通过力学性能的检测和切削性能的测定,表明随着铋含量的增加,合金的强度没有显著变化,延伸率降低,硬度增加,切削性能得到改善.添加了0.3%Ti的铋黄铜中,0.6%的铋含量的易切削黄铜力学性能适中,且切削性能与铅黄铜相当,具有广阔的应用前景.