文章以连接成形及增材制造设备及工艺课程为例,探索工科专业课程思政的教学目标、思政元素引入形式、情境设计和实施方式等,挖掘其蕴含思政元素的资源以及探索其与受教育者相契合的教育教学模式.经实施发现,开展"工程应用—实际问题—解决问题的人—职业素养的培养—价值观的树立"五步递进的项目引导式课程思政,能够使学生有效融入教学情境,学生的思想品质和专业素养也得到了明显提高.

利用Gleeble-1500热模拟机对Al-Mg-Si-Cu合金进行高温压缩变形模拟实验,分析了变形温度、应变速率和应变量对显微组织的影响.结果 表明:在应变速率和应变量一定时,变形温度较低时(380、430℃),合金变形带中未出现明显的再结晶晶粒,且有大量的位错杂乱的缠结在第二相粒子周围,形成位错塞积;变形温度较高时(480、530℃),变形带间出现了许多动态再结晶晶粒,晶粒的数量随着温度的升高而增加同时位错数量显著减少.在合金变形温度为480℃、应变量0.76时,再结晶晶粒随着应变速率升高,其数量有所增加而平均尺寸有所减小,再结晶程度增强.当合金在较低温度、较高应变速率和较小应变量下变形时,Al-Mg-Si-Cu合金主要软化机制为动态回复;在变形温度较高,应变速率较低,应变量较大时,合金的动态软化机制主要是动态再结晶.

采用热挤压对喷射沉积TiCp/ZA35复合材料进行致密化处理,分析挤压比压、挤压温度、挤压比及挤压速率对复合材料力学性能的影响.结果 表明:热挤压后,TiCp/ZA35复合材料中反应生成的增强相TiC颗粒在晶界和晶内分布均较均匀,组织中析出MnAl6强化相,相对密度提高;当挤压比压为430 MPa,温度为285℃,挤压比为12,速率为8 mm/s时,挤压后复合材料的抗拉强度为485.0 MPa、伸长率为9.53％.

基于人工神经网络(ANN),建立了ZA35合金热处理工艺对阻尼性能影响的人工神经网络模型,预测了固溶时效处理后ZA35合金的阻尼性能.模型输入参数为固溶时间、固溶温度、时效时间和时效温度,输出参数为ZA35合金的内耗值.结果表明:该模型可以预测ZA35合金在不同热处理工艺参数下的阻尼性能,也可以优化热处理工艺参数.预测的最大相对误差为13.54％,拟合率为0.982,最终确定ZA35合金阻尼性能最佳的工艺参数是340℃×5 h固溶+150℃×8 h时效处理.

用RC-LCD-1500-D-443-N激光熔覆工作站研究了功率对激光热处理ZA35合金组织、硬度和电化学性能的影响.结果表明:激光功率为850 W时,激光热处理ZA35合金枝晶的方向性减弱,晶粒细小,一次枝晶臂和二次枝晶臂尖端圆整,二次枝晶臂间距和腐蚀电流密度分别为15.26μm、1.087μA/cm2,与未激光热处理ZA35合金相比分别减小61.4％和62.6％,表面硬度增加22.5％.适宜激光功率850 W处理后的ZA35合金耐蚀性能增强的主要原因是合金的容抗弧半径增加,极化电阻增大,电极双电层电容下降,腐蚀驱动力降低.

采用喷射沉积Al-Ti-C预制体和ZA35合金的混熔体制备原位反应TiCP/ZA35复合材料,对TiCP/ZA35复合材料进行固溶时效处理.利用金相显微镜、X射线衍射(XRD)和电化学工作站研究了固溶与时效处理后复合材料的组织和电化学性能.结果表明,TiCP/ZA35复合材料组织为细小等轴晶,TiC颗粒分布均匀.经过350℃×4h固溶+150℃×6h时效处理后,析出相主要是MnAl6和Al11Cu5Mn3.在3.5％ NaCl溶液中,经过350℃×4h固溶+150℃×6h时效处理的复合材料腐蚀电流密度最小,为0.005 mA/cm2,相对于未处理复合材料减小73.7％.适宜热处理相对于未处理复合材料的电阻增加和电极双电层电容下降是改善耐蚀性的主要原因.在本实验中,TiCP/ZA35复合材料最佳的热处理工艺是350℃×4h固溶+150℃×6h时效.

The mode of academic evaluation is one of the important research contents to realize the application transformation of major training. The academic evaluation mode of major core curriculum was preformed on《Principle of Material Forming》of material forming and control specialty in Liaoning Technical University. The multiple academic evaluation modes were recommended including classroom performance, stage check, comprehensive training, turning classroom, practice check and the final exam. The experience proved the academic evaluation modes obtained the better effect.

The effect of solid solution time in two-stage solid solution treatment on microstructure and electrochemical corrosion property of Al-Cu alloy was investigated , and the proper solid solution treatment process was determined .The results show that the microstructure of the tested Al-Cu alloy is consists of α-Al,θ, S, T (Al13Cu4Mn3), Fe2Al3Si3 and Al65Cu20Fe9Mn6 phases.With the solution time prolonged at 490 ℃, the low melting point phases of Al-Cu alloy dissolve sufficiently , the high melting point phases dissolute on the second stage solution of 510 ℃, the second phase disperses evenly after aging .Electrochemical corrosion susceptibility of the Al-Cu alloy decreases firstly and then increases with the increase of solution time .Electrochemical corrosion rate of the Al-Cu alloy is the minimum of 0.035 mm· a-1 after 490 ℃×60 min+510 ℃×60 min two-stage solid solution treatment , less 50.7%than the corrosion rate of the alloy without solid solution treatment.So the two-stage solid solution treatment process is proper .

通过X射线衍射(XRD)、扫描电镜(SEM)、能谱(EDS)和金相(OM)分析,研究了Al-0.8Mg-1.0S-0.8Cu-0.3Mn-0.5Fe-0.15Zr合金的铸态组织,探讨了合金在均匀化退火前后析出相变化.结果表明:电磁搅拌铸锭的晶粒多呈等轴晶、析出相主要为Al2FeSi、Al9Fe0.84Mn2.16Si及Al4Cu2Mg8Si7,以及极少量的Mg2Si相和β-Si,但未观察到Al3Zr相.均匀化退火后,第二相质点分布均匀,Mg2Si相、Al4Cu2Mg8Si7相溶解消失,Mn元素替代了部分Fe元素,使(AlFeMnSi)相增多,针状β-Al2FeSi相转变为颗粒状α-Fe1.7Al4Si相,出现了Al3Zr相.

利用X射线衍射和金相显微镜等手段研究了三种Al-Cu合金的组织,测定了合金力学性能和磨损性能,分析了Si和Zr对Al-Cu合金组织和力学性能的作用机理.结果表明:Al-4.5Cu-1.5Mg-0.8Mn-0.5Fe-0.5 Si-0.15Zr合金抗拉强度、硬度和伸长率,比未添加Si和Zr的Al-Cu合金分别提高22％、30％和148％,综合力学性能最好;适量Si可改善合金成形性能,0.15％Zr在合金中起固溶强化和晶粒细化作用.

The effects of rolling process on the microstructure and mechanical property of Al-Mg-Si alloy sheet were investigated by the microstructure observation,strength,elongation and hardness properties tests,and the strengthening mechanism of the alloy was discussed.The results show that the microstructure and mechanical properties of the Al-Mg-Si alloy sheet are changed significantly by different rolling process.Under the same total deformation conditions,the tensile strength,yield strength,elongation and hardness of rolling third state and second state are significantly better than those of the rolling first state.In the three kinds of rolling process,rolling third state plate has the best comprehensive mechanical property,where the tensile strength,yield strength,elongation and hardness reach 398.4 MPa,325.8MPa,20%and 112.0,respectively.The strengthening mechanism of rolling third state alloy is characterized by the interaction of deformation strengthening,grain refinement strengthening and second phase strengthening.

In this paper, a AlMgSi alloy for sheet materials was designed on the base of 6111 aluminum alloy, the alloy sheet was fabricated by the rolling process combination of hot and cold rolling, the effect of rolling process on the microstructure of alloy was studied. The results show that different 1st rolling pass reductions of 13%, 33% and 47%, alloy microstructure changes obviously. With the increasing of 1st rolling pass reductions, the re-crystallization structure grow in quantity, re-crystallization grain more and more dense, flat, uniform, and the second phase particles are also more small, distributes more uniform. When the first cold rolled reduction is 47%, degree of grain refinement, the second phase particles fragmentation and tissue uniformity in rolling 3st state are obviously superior to the 1st state and 2st states. The deformation inhomogeneity can be overcome by improving the first reduction rate, the re-crystallization process of synchronization between surface layer and the center layer is better.

为了给制定和优化热加工工艺参数提供理论依据,采用Gleeble-1500热模拟机研究了含锆Al-Mg-Si合金在变形温度为653～803 K、变形速率为0.01～10 s-1条件下的热压缩变形的流变应力行为,并通过回归法建立材料变形的流变应力数学模型.结果表明:该合金为正应变速率敏感材料,真应力-真应变曲线存在明显的稳态流变特征;流变应力随着变形速率的增加以及变形温度的降低而增加;在较低变形温度条件下,真应力-真应变曲线为动态回复曲线;在较高变形温度条件下真应力-真应变曲线为动态再结晶曲线.该合金流变应力σ可用包含Arrhenius项的Zener-Hollomon参数的函数来描述,式中A、α和n的值分别为1.89×1010s-1、0.024 MPa-1和7.46,热变形激活能Q为166.85 kJ/mol.

The microstructures and compressive properties of arc-melted Fe100-xNbx(x=6, 9, 12, 15, 17) alloys, which are relevant to eutectic reaction (L -> alpha-Fe+Fe2Nb), were investigated by SEM, XRD and test machine system 810 (TMS 810). The results showed that the microstructure of the ingot sample consisted of primary phase (alpha-Fe or Fe2Nb) and sub-micro-sized eutectics. Fe91Nb9 alloy had the best comprehensive properties with ultimate strength about 1.63 GPa, yield strength about 1.04 GPa and compressive strain ductility about 23%. For alloy Fe91Nb9, the substitution of Hf element for Nb element produced no observable effects on both the microstructure and the compressive mechanical properties; while the substitution of Y element for Fe element resulted in obvious change in the microstructure and dramatic deterioration in the mechanical properties.

The effect of Al2O3 on the wear resistance of laser cladding nickel-based alloy coating is investigated.Through the results of microstructure observations,hardness test and wear test it shows that the addition of Al2O3 can modify the microstructure and properties of laser cladding coating.The microstructure gets refined and wear resistance are conspicuously improved.

The effect of various percentage of Al2O3 content on the corrosion of laser cladding nickel-based alloy layer is investigated in this study. In particular, a comparative test with various percentages of Al 2O3 content on Al2O3/Ni cladding interface is conducted. In the test, SSX-500 electron microscope is used to scan the microstructure and morphology of cladding layer, and electrochemical corrosion and salt spray experiment is used to test the corrosion of coating. The results show that microstructure of cladding layer becomes finer after adding A12O3 to nickel-based alloys powder. When the content of A12O3 reaches 40%, passivation current density reaches minimum while passivation area reaches maximum. In the salt spray experiment, unit area gains 1.15mg/mm more weight, which is about 48.5% reduction in terms of Ni60 matrix without Al2O3. Therefore, corrosion resistance is significantly enhanced.

The effect of various percentage of Al2O3 content on the corrosion of laser cladding nickel-based alloy layer is investigated in this study. In particular, a comparative test with various percentages of Al2O3 content on Al2O3/Ni cladding interface is conducted. In the test,SSX-500 electron microscope is used to scan the microstructure and morphology of cladding layer, and electrochemical corrosion and salt spray experiment is used to test the corrosion of coating. The results show that microstructure of cladding layer becomes finer after adding Al2O3 to nickel-based alloys powder。When the content of Al2O3 reaches 40%,passivation current density reaches minimum while passivation area reaches maximum. In the salt spray experiment, unit area gains 1.15mg/mm2 more weight, which is about 48.5% reduction in terms of Ni60 matrix without Al2O3. Therefore, corrosion resistance is significantly enhanced.

The nano-insertion-composite between MMT and epoxy resin(EP) molecule was accomplished when EP matrix resin was inserted between nano-MMT layers by organic treatment. With matrix resin,DBP toughener,nano-MMT filler and JA-1 curing agent as four factors,and the tensile shear strength of nano-MMT/EP adhesive as evaluation index,so the optimal composition of nano-MMT/EP adhesive was preferred by orthogonal experiment method,and the relationship between various factors was discussed under interaction condition. The experiment results showed that the tensile shear strength(23.65 MPa) was maximum when mass ratio of E-44∶E-51∶DBP∶MMT∶ JA-1was 30∶70∶17∶3∶25 in adhesive composition.

The multiphase interface of steel fiber reinforced polymer concrete(SFPMC) which is composed of polymer,steel fiber,aggregate and filler can be meliorated by using KH-550,so the strength of SFPMC is improved.SFPMC was fabricated by using steel fiber with different amount and rate of length and diameter.The coupling effect of KH-550 was discussed.The result shows that steel fiber which applies coupling treatment of KH-550 has greater reinforcement on compressive strength of SFPC than that which does not applies coupling treatment.The greatest compressive strength of SFPC which applies with coupling treatment reaches 110.8MPa,higher 13.68 % than that do not apply coupling treatment.