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| 1 | Si含量对新型FM钢时效处理后腐蚀性能的影响显示文摘研究设计了Si含量分别为0.6%、0.9%、1.2%和1.5%的11.5CrMoWXSi铁素体马氏体(FM)钢,通过时效处理获得了试样不同的微观组织,研究了Si含量对其腐蚀性能的影响。结果表明:Si元素影响了FM钢组织中第二相颗粒的分布,进而影响其腐蚀性能。随着Si含量的增加,老化前的FM钢钝化电流密度越大,钝化区域的宽度也越短,点蚀电位Ep的值越小,材料耐蚀性也较差;经老化400 h后,FM钢组织中M23C6碳化物由晶内弥散分布逐渐转化为在晶界处析出,且高Si含量的FM钢中由于Laves相的形核长大,有利于材料表面钝化膜的形成,其耐蚀性得到改善。 | 胡建军 陈泽 杨俭 陈国清 周文龙 | 2021 | 热加工工艺2021，50，4： | 1 |
| 2 | Failure analysis of ring die of a feed pellet machine显示文摘The severely worn position and failure mechanisms of the ring die of a feed pellet machine were investigated.The macroscopic and microscopic morphologies of the failed surface,the chemical composition and mechanical properties of the collected samples were analyzed using scanning electron microscopy,energy disperse spectroscopy,optical emission spectrometry,and a universal testing machine.Results show that the dip angle at the entrance of the ring die hole between the roller and ring die was severely worn.The feed powder could not be fully extruded through the dip angle at the entrance of the ring die holes,thus the density of the feed particles produced could not meet the requirements.Therefore,abrasive wear under high stress is the main reason of failure at the entrance of the ring die holes under the action of feeding powder;and cutting and fatigue spalling lead to substantial material loss.In addition,a high damp-heat environment aggravates abrasive wear on the die hole internal surface. | He-da Bai Bao-chao Zheng Wei Li Xiao-hui Tu | 2020 | China Foundry2020，17，2： | 1 |
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