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时间:2019-05-13
《孔隙度对烧结不锈钢纤维多孔材料压缩性能的影响》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第27卷第5期粉末冶金技术Vo1.27.NO.52009年10月PowderMetallurgyTechnology0ct.2009孔隙度对烧结不锈钢纤维多孔材料压缩性能的影响米王建永一汤慧萍一朱纪磊乔吉超藏纯勇敖庆波李程(西北有色金属研究院金属多孔材料国家重点实验室,西安710016)摘要:采用丝径为1001xm的不锈钢纤维经松装烧结工艺制备了孔隙度在70%~95%之间的金属纤维多孔板材。在MTS858材料试验机上检测压缩性能,结果表明:孔隙度在82.8%以下的试件的面内应力应变曲线大致分为三个阶段,应变很低情况下的线性弹性区
2、、屈服平台区和应力急剧增大情况下的致密化区,其中屈服平台区较长,说明该材料具有较强的能量吸收能力;随着孔隙度的增加,不锈钢纤维多孔材料的卸载模量、屈服强度减小,其中孔隙度为70%的烧结不锈钢纤维多孔材料的平均卸载模量为5.2GPa,平均屈服强度达到了23MPa;孔隙度大于90.1%的试件屈服强度很低,能量吸收能力很小。关键词:金属纤维多孑L材料;压缩性能;孔隙度;屈服强度;超轻金属材料Effectofporosityoncompressivepropertiesofporoussinteredstainlesssteelfibe
3、rmediaWangJianyong,TangHuiping,ZhuJilei,QiaoJichao,ZangChunyong,AoQingbo,LiCheng(NorthwestInstituteforNon—ferrousMetalResearch,StateKeyLaboratoryofPorousMetalMaterials,Xi’an710016,China)Abstract:Poroussintered316LstainlesssteelfibersoflO0p~mindiameterwerefabricatedby
4、loosesinteringtechnology,withporosityfrom70%一95%.AndcompressivepropertiesoftheporoussinteredstainlesssteelfibermediawereinvestigatedbyusingMTS858systematroomtemperature.Theresultsindicatethatthecompressivestress—straincurvesofporoussinteredstainlesssteelfibermedia.wi
5、thporositylessthan82.8%exhibitsthreedistinctregions(threedeformationstages)undercompressiveloading,i.e.,elasticstage,aplateaustagethatoccursafteryieldingandfinaldensificationregionwherethestressincreasesdrastically.Moreover,compressivestress—straincurvesoftheporoussi
6、nteredstainlesssteelfibermediapresentsmoothandlongplateaustages.Therefore,theporoussinteredstainlesssteelfibermediashowexcellentenergyabsorptioncapacity.Byincreasingporosity,itisobviousthatthecompressiveyieldstrengthslumps.Moreover,theunloadedYoung’Smodulusgraduallyd
7、ecreaseswithincreaseofporosity.ItcanbefoundthattheaverageunloadedYoung’Smodulusandaveragecompressiveyieldstrengthoftheporoussinteredstainlesssteelfibermediawithporosityof70%is5.2GPaand23MPa.Instead,whenporosityismorethan90.1%.theenergyabsorptioncapacityoftheporoussin
8、teredstainlesssteelfibermediaisverylittle.Keywords:metalfibrematerial;compressiveproperty;porosity;yieldstrength;ultra—lightporousm
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