CAJ | 학술논문

采用粉末冶金法制备H13钢(Steel 1)、TiC颗粒增强的钢基复合材料(Steel 2)以及Ni包覆TiC颗粒增强的钢基复合材料(Steel 3)，研究TiC颗粒及其表面镀镍对H13钢的致密度、微观组织与形貌、以及力学性能的影响，并通过烧结动力学方程研究TiC颗粒及颗粒表面镀镍对材料力学性能的影响机理。结果表明：在1400℃温度下，随烧结时间延长，3种材料的致密度均增加，而在相同的烧结时间下，钢的密度为r(Steel 1)＞r(Steel 3)＞r(Steel 2)。在1400℃/2 h条件下烧结的Steel 1的致密度为97.27%，抗拉强度达到1069 MPa；添加TiC颗粒增强相后，材料的致密度、抗拉强度、伸长率和冲击韧性都下降，但TiC表面镀镍后，材料的致密度及力学性能均得到改善。孔隙率、增强颗粒分布以及颗粒与基体的界面状况不同，是导致3组材料力学性能差异的主要原因。
채용분말야금법제비H13강(Steel 1)、TiC과립증강적강기복합재료(Steel 2)이급Ni포복TiC과립증강적강기복합재료(Steel 3)，연구TiC과립급기표면도얼대H13강적치밀도、미관조직여형모、이급역학성능적영향，병통과소결동역학방정연구TiC과립급과립표면도얼대재료역학성능적영향궤리。결과표명：재1400℃온도하，수소결시간연장，3충재료적치밀도균증가，이재상동적소결시간하，강적밀도위r(Steel 1)＞r(Steel 3)＞r(Steel 2)。재1400℃/2 h조건하소결적Steel 1적치밀도위97.27%，항랍강도체도1069 MPa；첨가TiC과립증강상후，재료적치밀도、항랍강도、신장솔화충격인성도하강，단TiC표면도얼후，재료적치밀도급역학성능균득도개선。공극솔、증강과립분포이급과립여기체적계면상황불동，시도치3조재료역학성능차이적주요원인。
H13 steel (Steel 1), TiC reinforced steel matrix composites (Steel 2) and Ni cladding TiC reinforced steel matrix composites (Steel 3) were fabricated by powder metallurgy method. The effects of TiC particles and its surface nickel plating on densification, microstructure, morphology and the mechanical property of the H13 composites were studied. The affect mechanism of TiC particles and its surface nickel plating on mechanical property of H13 composite were also explored by sintering kinetic equation. The results show that, the three types of composites densities increase with increasing sintering hold time when sintering at 1 400℃; when at the same sintering hold time the densifications of the three steel are as: steel 1>steel 3>steel 2; Steel 1 with the maximum relative density of 97.27%, and tensile strength of 1 069 MPa can be obtained by sintering at 1 400℃ for 2 h; the density, tensile strength, elongation and impact toughness of the composite all decrease after adding TiC particles as reinforcements, the mechanical properties of H13 steel matrix composites improve when adding nickel plating TiC particles as reinforcements. Porosity, distribution of TiC particles and interfacial bonding are the main factors to result in the difference in mechanical properties of the three steel composites.