硼含量对ZGMn13Cr2组织和性能的影响

在ZGMn13Cr2中加入不同含量的硼(0.001 5%~0.01%),1 110℃水韧处理后,随着硼含量的增加,硬度随之升高,在220~278 HBS之间变化;同时冲击韧性下降,最高值αk=178.5 J/cm2,最低值αk=135.6 J/cm2.金相组织中析出和未溶碳化物增多,呈颗粒状弥散分布.在低冲击应力磨料磨损条件下,耐磨性能随硼的增加而提高,SEM照片显示磨损表面形貌由犁沟状转变为以碾压痕和沟槽为主,并有少量犁沟.ZGMn13Cr2中加入质量分数0.003%~0.006%的硼,综合性能较好.

Effect of Boron Content on Structure and Properties of ZGMn13Cr2

Adding different boron contents (0.0015%-0.01%) in ZGMn13Cr2, its hardness increases in a HBS range from 220 to 278 with the boron content added after water toughness treatment at 1110°C. Simultaneously, its impact toughness decreases in the range that the maximum αk=178.5 J/cm² and minimum αk=135.6 J/cm², and it is shown metallographically that the more the boron content, the more the undissolved carbides which are distributed dispersively in granular form. Moreover, its wearability is improved with increasing boron addition under the low-impact abrasive wear. SEM images show the morphology of its worn surface on which the furrow-like traces become mainly the milled traces and ditches with few furrow-like ones. It is revealed that the ZGMn13Cr2 in which 0.003%-0.006% of boron is added can offer best overall performance on the whole.