连续挤压及热处理对H68黄铜组织与性能的影响  

Influence of Continuous Extrusion and Heat Treatment on the Microstructure and Properties of H68 Brass

作　　者：王文[1] 谌昀[2] 李夏雷[1] 周海涛[1] 李小龙[1] 余玖明[1,2] 刘克明[2] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]江西省科学院应用物理研究所,江西南昌330029

出　　处：《热处理技术与装备》2015年第6期7-11,共5页Heat Treatment Technology and Equipment

基　　金：国家自然科学基金项目(51461018);江西省国际科技合作项目(2015BDH80006);江西省自然科学基金重点项目(20133BAB20008;20144ACB20013);江西省科学院科技计划项目(2013-YYB-1;2013-XTPH1-19)

摘　　要：采用光学显微镜、扫描电子显微镜和液晶电子拉力试验机研究了连续挤压和退火处理对H68黄铜的组织、抗拉强度、延伸率和拉伸断口的影响。结果表明,经连续挤压和退火处理后,H68黄铜的延伸率随着退火温度的增加而增加,抗拉强度随着退火温度的增加略有下降;组织主要由粗大的等轴晶经不规则的长条状转变为多个小晶粒包围一个大晶粒的排布;其拉伸断裂方式由准解理断裂经韧窝断裂转变为韧窝-微孔聚集型断裂;具有较好的塑性变形能力,且随着退火温度的增加逐渐提高。The effect of continuous extrusion and annealing treatment on the microstructure,tensile strength,elongation and fracture surface of H68 brass was investigated by optical microscopy,scanning electronic microscopy and LCD-electronic tensile-testing machine. After continuous extrusion and annealing treatment,the elongation increases and the tensile strength decreases with increasing annealing temperature. The microstructure changes from coarse equiaxed grains through irregular long strips to the distribution of more small grains surrounding a large grain. The fracture mode varies from cleavage fracture through dimple frature to dimple-microvoid coalescence fracture. The plastic deformation ability is high and increases with increasing annealing temperature.

关 键 词：H68黄铜 连续挤压 退火 组织 性能 

分 类 号：TG379[金属学及工艺—金属压力加工] TG166.2[一般工业技术—材料科学与工程] TG146.11[金属学及工艺—金属材料]