The influence of carbon in martensitic matrix ( by use different austenizing temperature) on two body abrasive and impact-abrasive wear resistance of ductile iron is studied. 针对马氏体球铁,研究了马氏体基体不同含碳量(不同奥氏体化温度)对两体磨损和冲击磨料磨损耐磨性的影响。
The composites is mainly composed of dispersively distributed VC particles and martensite with austenizing for 3 hours at 960 ℃ and quenching, where the hardness of the composites is 62 and impact toughness is 7.9 J/ cm2. 在960℃奥氏体化3h并淬火的条件下,复合材料主要由弥散分布的VC颗粒与马氏体组成,其硬度HRC为62,冲击韧度为7.9J/cm2。
The results indicate that ultra-fine spheroidized carbides were formed by complete austenizing with high temperature tempering, and ultra-fine martensite or pearlite could be formed when the steel was then heated to lower austenizing temperature and quenched or normalized. 试验表明,该钢完全奥氏体化淬火后通过高温回火得到大量超细球状碳化物,然后在低温奥氏体化进行二次淬火和正火,获得超细马氏体、珠光体。
After austenizing and air-cooling, the microstructure of the sample is smaller and more homogeneous; 试样经奥氏体化连续空冷后,与铸态组织相比,组织更细小均匀,晶界特征消失。
The results indicate that: duringcontinuous heating some nodular cementites are still remained and undissolved even at 1200 ℃, and thus it is difficult to carry out austenizing uniformly. 结果表明:在连续加热条件下,该钢加热至1200℃,仍有少量球状渗碳体不能溶解。且奥氏体难以实现均匀化。
Effect of Austenizing Time on the Microstructure and Wear Resistance of the HSS Work-Roll 奥氏体化保温时间对高速钢工作辊组织和耐磨性的影响
It is found that austenizing temperature has a great influence on the density and morphology of twinned martensite by means of TEM. It is known that the twinned martensite in steel has some influence on the toughness to a certain extent by the analysis of mechanical properties. 用透射电镜观察发现奥氏体化温度对显微组织中孪晶数量和形态有很大影响,结合力学能分析可知,钢中存在的孪晶对韧性有一定影响。
The effect of austenizing time on the microstructure and wear resistance of the HSS work-roll manufactured by centrifugal casting method were investigated. The SEM, EDS, X-ray diffraction analysis, and hardness measurement were conducted on the material to identify carbides. 制备了高碳高钒系高速钢辊环,通过SEM、EDS、XRD分析以及硬度测量研究了奥氏体化保温时间对高碳高钒系高速钢轧辊材料的组织和耐磨性的影响。