热加工工艺
熱加工工藝
열가공공예
HOT WORKING TECHNOLOGY
2010年
3期
38-42
,共5页
罗永新%龙华%张来希%程利
囉永新%龍華%張來希%程利
라영신%룡화%장래희%정리
AZ91镁合金%热变形%流变应力
AZ91鎂閤金%熱變形%流變應力
AZ91미합금%열변형%류변응력
AZ91 magnesium alloy%hot compression deformation%flow stress
在应变速率为0.01~50s-1时、温度为300~450℃条件下,在热压机上对AZ91镁合金的高温热压缩变形特性进行了研究,并通过金相显微镜观察合金热变形过程中的组织变化情况.研究发现,应力、应变曲线随温度的升高而降低,随应变速率的升高而升高.为了消除热电偶测温的滞后性对试样温升的影响,对实测流变应力值进行了修正.在相同应变速率、相同应变下,修正的应力要高于未修正的应力.
在應變速率為0.01~50s-1時、溫度為300~450℃條件下,在熱壓機上對AZ91鎂閤金的高溫熱壓縮變形特性進行瞭研究,併通過金相顯微鏡觀察閤金熱變形過程中的組織變化情況.研究髮現,應力、應變麯線隨溫度的升高而降低,隨應變速率的升高而升高.為瞭消除熱電偶測溫的滯後性對試樣溫升的影響,對實測流變應力值進行瞭脩正.在相同應變速率、相同應變下,脩正的應力要高于未脩正的應力.
재응변속솔위0.01~50s-1시、온도위300~450℃조건하,재열압궤상대AZ91미합금적고온열압축변형특성진행료연구,병통과금상현미경관찰합금열변형과정중적조직변화정황.연구발현,응력、응변곡선수온도적승고이강저,수응변속솔적승고이승고.위료소제열전우측온적체후성대시양온승적영향,대실측류변응력치진행료수정.재상동응변속솔、상동응변하,수정적응력요고우미수정적응력.
The hot compression tests of AZ91 magnesium alloy were performed on warmpress at strain rates 0.01~50s-1 and deformation temperatures 300~450℃,and the microstructures of AZ91 magnesium during compression were observed by microscope.The results show that with the increase of temperatures and the decrease of strain rates.the stress-strain curves decrease.In order to eliminate the influence of temperature rise induced by hysteresis of thermocouple thermometer,the actual measured flow strees are corrected.The corrected flow stress is generally higher than the uncorrected at the same swain rates and strain.