热处理对W-Ni-Fe高密度合金组织与性能影响  

Influence of thermal process on the microstructure and properties of W-Ni-Fe high-density alloy

作　　者：晏建武[1,2] 周继承[2] 鲁世强[1] 赵业奎[1] 

机构地区：[1]南昌航空工业学院材料科学与工程系,江西南昌330034 [2]中南大学物理科学与技术学院,长沙410083

出　　处：《国外金属加工》2005年第4期43-49,共7页

基　　金：江西省材料科学与工程研究中心开放基金（ZX200301008）资助项目

摘　　要：实验采用高能球磨机械合金化结合模压和真空烧结法制备了成分为90W-4Ni-2Fe-0．4Co-3．2Mo-0．4Re的合金试样。采用正交实验方法对该试样进行淬火处理。测量了热处理前后试样的密度，及钨晶粒大小。用扫描电镜观察其显微组织，用EDS能谱仪分析了晶界上的氧含量。结果表明：高密度钨合金90W-4Ni-2Fe-0．4Co-3．2Mo-0．4Re在空气中进行热处理会产生严重氧化，750℃的氧化速率为11．9mg／h，950℃时的氧化速率为13．625mg／h，在1150℃时会严重氧化产生很厚的氧化皮：经950℃×1h热处理后，相界面上的氧含量由于向晶内扩散从热处理前的6．65％降到5．52％，在相同保温时间的情况下，经1150℃热处理后晶界上氧含量降到2．3％；热处理后钨晶粒大小与时间呈线性关系，合金试样的密度随热处理温度的升高而增大，维氏硬度基本都在320N／mm^2，比热处理前大约降低了10N／mm^2，且压痕都没有出现裂纹，说明合金试样具有较好的韧性。W-Ni-Fe Ttmgsten high-density alloys 90W-4Ni-2Fe-0.4Co-3.2Mo-0.4Re were fabricated by high energy ball milling mechanical alloying, combined mould compact and lower temperature sintering technique. The Relative density of alloys specimens were tested by the Draining Water Law of Archimedes and its granularities and appearances of specimens after different thermal process have been analyzed by SEM . The oxygen content was determined by EDS. The results show that oxidation is seriously when the heat treatment of alloy subjected in air, the oxidation rate is 11.9 mg/h in 750 ℃ and it is 13.625 mg/h in 950℃ .Thickness oxidation plate is appears in 1 150℃. The oxygen content in grain interface decreases from 6.65% to 5.52% after thernal process at 950℃ for 1 h, and it decreases from 6.65% to 2.3% after thermal process at 1 150℃ for 1 tl. There is linear relationship with granularities and thermal process time. When the thermal process temperature increases, the density of alloy increases. The hardness of specimens decreases from 330 N/mm^2 to 320 N/mm^2 after they are thermal processed. There is no crack appearing on the surface of specimens, and the toughness of specimens is better compare to specimens before thermal process.

关 键 词：W-Ni-Fe高密度合金 机械合金化 热处理 组织与性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TF125.241[金属学及工艺—金属材料]