粉末冶金材料科学与工程
粉末冶金材料科學與工程
분말야금재료과학여공정
Materials Science and Engineering of Powder Metallurgy
2015年
5期
717-724
,共8页
楚志兵%杨彦龙%唐宾%马立峰%杨霞%黄庆学
楚誌兵%楊彥龍%唐賓%馬立峰%楊霞%黃慶學
초지병%양언룡%당빈%마립봉%양하%황경학
轧制%固态扩渗%镁合金%表面性能%Ls-DYNA
軋製%固態擴滲%鎂閤金%錶麵性能%Ls-DYNA
알제%고태확삼%미합금%표면성능%Ls-DYNA
rolling%solid diffusion%magnesium alloy%surface performance%Ls-DYNA
引入"固态扩渗+轧制"的表面改性方式,即在研究镁合金薄板表面改性方法及工艺的基础上,采用固态粉末包覆热扩渗的方法,对AZ31镁合金薄板进行表面改性处理,获得研究目标材料;借助有限元软件Ls-DYNA模拟其冷轧过程,获得最优的轧制工艺参数并进行轧制实验,通过X-射线衍射(XRD)、金相显微镜、布氏硬度测量计、往复式摩擦磨损试验机和CorrTest腐蚀电化学测试系统检测材料表面的组织与性能.结果表明:轧制变形后的表面组织晶粒更加细小、均匀;耐磨性有所改善,表面硬度由HB 61.4提高至HB 63.5,摩擦因数由0.52变为0.6,表面摩擦磨损质量损失由0.33 mg降低至0.26 mg;表面耐腐蚀性能显著提高,其开路电位由?1.594 V变为?1.574 V,自腐蚀电位由?1.574 V变为?1.38 V,自腐蚀电流密度由6.2×10?3 mA/cm2变为7.0×10?4mA/cm2.
引入"固態擴滲+軋製"的錶麵改性方式,即在研究鎂閤金薄闆錶麵改性方法及工藝的基礎上,採用固態粉末包覆熱擴滲的方法,對AZ31鎂閤金薄闆進行錶麵改性處理,穫得研究目標材料;藉助有限元軟件Ls-DYNA模擬其冷軋過程,穫得最優的軋製工藝參數併進行軋製實驗,通過X-射線衍射(XRD)、金相顯微鏡、佈氏硬度測量計、往複式摩抆磨損試驗機和CorrTest腐蝕電化學測試繫統檢測材料錶麵的組織與性能.結果錶明:軋製變形後的錶麵組織晶粒更加細小、均勻;耐磨性有所改善,錶麵硬度由HB 61.4提高至HB 63.5,摩抆因數由0.52變為0.6,錶麵摩抆磨損質量損失由0.33 mg降低至0.26 mg;錶麵耐腐蝕性能顯著提高,其開路電位由?1.594 V變為?1.574 V,自腐蝕電位由?1.574 V變為?1.38 V,自腐蝕電流密度由6.2×10?3 mA/cm2變為7.0×10?4mA/cm2.
인입"고태확삼+알제"적표면개성방식,즉재연구미합금박판표면개성방법급공예적기출상,채용고태분말포복열확삼적방법,대AZ31미합금박판진행표면개성처리,획득연구목표재료;차조유한원연건Ls-DYNA모의기랭알과정,획득최우적알제공예삼수병진행알제실험,통과X-사선연사(XRD)、금상현미경、포씨경도측량계、왕복식마찰마손시험궤화CorrTest부식전화학측시계통검측재료표면적조직여성능.결과표명:알제변형후적표면조직정립경가세소、균균;내마성유소개선,표면경도유HB 61.4제고지HB 63.5,마찰인수유0.52변위0.6,표면마찰마손질량손실유0.33 mg강저지0.26 mg;표면내부식성능현저제고,기개로전위유?1.594 V변위?1.574 V,자부식전위유?1.574 V변위?1.38 V,자부식전류밀도유6.2×10?3 mA/cm2변위7.0×10?4mA/cm2.
In order to obtain the target material for the present investigtion, the new surface modification of "solid diffusion+rolling" was introduced. It was on the basis of studying the surface modification and the technology of AZ31 magnesium alloy sheet, and then the method of solid diffusion was applied to deal with the sheet. After that, by using the optimum rolling technology parameters which got from the cold rolling simulation by the finite software of Ls-DYNA to conduct the rolling test. Finally after the test, the X-ray diffraction (XRD), metallographic microscope, Brinell hardness tester, reciprocating friction &wear tester and Corr Test corrosion electro-chemistry test system were used to analyze the surface organization and performance of the target material. The results show that the grain structure of the surface is finer and more uniform after the rolling deformation and the abrasion resistance is greatly improved, which shows that the surface hardness increases from HB 61.4 to HB 63.5, the friction coefficient changes from 0.52 to 0.6 and the friction wear mass loss of the surface decreases from 0.33 mg to 0.26 mg. Besides, the anti-corrosion properties of the surface is also greatly improved, which shows that the open-circuit potential changes from?1.594 V to?1.574 V, the free corrosion potential changes from?1.574 V to?1.38 V and the free corrosion current density changes from 6.2×10?3 mA/cm2 to 7.0×10?4 mA/cm2.
