等径角挤压对Fe-18.39Mn合金组织和阻尼性能的影响  

Effect of ECAP on microstructure and damping capacity of Fe-18.39Mn alloy

作　　者：黄姝珂[1] 李宁[1] 文玉华[1] 丁胜[1] 莫华强[1] 李聪[2] 

机构地区：[1]四川大学制造科学与工程学院,四川成都610065 [2]中国核动力研究设计院四所,四川成都610064

出　　处：《材料热处理学报》2007年第5期66-69,共4页Transactions of Materials and Heat Treatment

基　　金：核燃料及材料国家级重点实验室基金(51481040203sc0-102);上海交通大学机械系统与振动国家重点实验室开放基金(VSN-2007-04)

摘　　要：采用等径角挤压(ECAP)工艺改变Fe-18.39Mn合金的ε马氏体片形态,进而研究其对合金阻尼性能的影响。在微机控制电液伺服万能实验机上利用自制模具进行ECAP实验,采用倒扭摆测试合金阻尼性能,扫描电子显微镜观察微观组织。结果表明:Fe-18.39Mn合金在300℃进行ECAP后,由于高密度位错的钉扎,阻尼性能丧失;经过600℃退火,没有改变其ECAP后的组织,阻尼性能仍然很低;而在高于700℃的温度退火处理能大量消除高密度位错,并在一定程度上改变ε马氏体片的形态,使ε马氏体片细化,交叉程度降低,进而阻尼性能较未ECAP时得到提高。Equal channel angular pressing （ECAP） and annealing treatment were employed to study the effect of ε-martensite＇s shape on the damping capacity of Fe-18.39Mn alloy. ECAP was conducted on a microcomputer controlled electro-hydraulic servo testing machine. The damping capacity was measured using reversal torsion pendulum. The microstructure was observed using SEM. The results indicate that after ECAP at 300℃, the damping capacity of Fe-18.39Mn alloy is vanished because of the pinning of high density dislocations. Annealing at 600℃, damping capacity of the alloy is still low because there are not any changes in microstructure. Annealing above 700℃, however, the microstructure is recovered and the ε-martensite plates are smaller whose intercross degree is also decreased, so the damping capacity is improved.

关 键 词：等径角挤压(ECAP) 阻尼合金 阻尼性能 Fe—Mn Ε马氏体 

分 类 号：TG135.7[一般工业技术—材料科学与工程] TG376[金属学及工艺—合金]