Two new kinds of Ni-based and Fe-based alloy power have been developed. Both kinds of power have been successfully coated by laser cladding on the surface of stainless steel as strengthening layers. The morphology and microstructure of these coatings have been analyzed by SEM and XRD, the mircohardness, wear and corrosion resistance of Ni-based and Fe-based laser cladding coatings have been measured respectively. The analysis reveals that both coatings with smooth and successive surfaces and homogeneous morphology have been obtained under the proper laser processing parameters; besides, Ni-based and Fe-based coatings have fine, well-proportioned and dense microstructure, and better joints with the substrates, respectively. So the results indicate that Ni-based and Fe-based alloys can supersede the cobalt-based alloys in the certain conditions.

The short glass fiber (SGF)/polypropylene (PP) composites were prepared by extrusion and subsequently injection processes. The evolution of phase structures and mechanical properties of SGF/PP composites were performed using scanning electron microscopy (SEM), contact angle tensiometer, universal testing machine and impact tester. The results show that the interfacial adhesion between SGF and matrix were enhanced significant with the presence of maleic anhydride grafted PP (PP-g-MAH) and maleic anhydride grafted ethylene-1-octene copolymer (EOC-g-MAH). Moreover, the EOC-g-MAH promoted to form the novel configuration of EOC-g-MAH particles adhered firmly onto SGF surfaces, which resulted in the much higher impact toughness and tensile strength.

The carbon fiber cement has compression sensibility. In this paper, the compression sensitivity of carbon fiber concrete is analyzed by Scanning Electron Microscopy with single fiber pull-out testing. Results show that the resistance of carbon fiber cement increases during the tensile test, the fractional change in resistance per unit strain of The carbon fiber cement is 38.38±0.05. In the meantime, the variation of resistance of single fiber pull-out under cyclic loading was studied. The resistance change caused by the elastic deformation is reversibility.

The polypropylene/ethylene-1-octene/short glass fiber (PP/EOC/SGF) ternary composites were prepared by extrusion and subsequent injection processes. The effects of compatilizers, including maleic anhydride grafted PP (PP-g-MAH) and maleic anhydride grafted EOC (EOC-g-MAH), on the evolution of phase structures and mechanical properties of PP composites were examined. Results show that the interfacial adhesion between SGF and matrix are enhanced significantly. Moreover, the EOC-g-MAH promotes to form the elastomeric particle-embedded configuration. Mechanical testing reveals that the PP/EOC/SGF composites characterized by much higher impact toughness and keeping the competitively tensile properties could be obtained through co-incorporation of SGF and EOC as well as right compatilizers adopted.

The influence of static load and impact load in the same value of low stress on microstructure and micro-strain of T10 steel specimens is studied. The results show that softening and hardening phenomenon of Specimen appears alternately in the process of being loaded. Hardness value will tend to stable when loading time or impact times increase to a certain value. Compared to impact load，static load has a more well-distributed、pyknotic microstructure and a smaller variable quantity of microscopic strain.