摘要
利用扫描电镜和电子背散射衍射技术对Cr Ni Mo、Mo Ti B高强高韧性马氏体钢冲击磨损试验后的耐磨性能进行研究。结果表明：在1.5 J的冲击作用下,随着冲击时间的增长Cr Ni Mo钢耐磨性比Mo Ti B钢的要差,在2.5 J冲击作用下,随着冲击时间的增加,Cr Ni Mo钢耐磨性比Mo Ti B钢的要好,其原因是小角度晶界密度的提高有助于提高钢的耐磨性能。在3.5 J冲击作用下,Cr Ni Mo钢耐磨性随冲击时间延长呈现先降低后增加的趋势,但一直高于Mo Ti B钢的耐磨性;其中,Cr Ni Mo钢中马氏体组织逐步分解成为铁素体基体以及大量的尺寸约500 nm的硬质碳化物,这些碳化物在基体组织中起到支撑作用,减少基体与磨料之间的接触,从而提高了材料的耐磨性能。
Wear resistance of Cr Ni Mo steel and Mo Ti B steel with high strength and high toughness under abrasive impact wear was studied by using scanning electron microscopy（ SEM） and electron back scattering diffraction technology（ EBSD）. The results show that under the action of 1. 5 J impact energy,the wear resistance of Cr Ni Mo steel is becoming poorer than that of Mo Ti B steel as the impact time goes on.Under 2. 5 J impact energy,the wear resistance of Cr Ni Mo steel is becoming better than that of Mo Ti B steel as the impact time goes on,the reason is that the increase of the density of small angle grain boundaries improves the wear resistance of the steel. Under 3. 5 J impact energy,the wear resistance of Cr Ni Mo steel tends to decrease first then increases the impact time goes on,but is always higher than that of Mo Ti B steel. It is due to that the low temperature tempering martensite structure in Cr Ni Mo steel gradually decomposes into ferrite matrix and plenty of hard carbide of about 500 nm in size,such carbides strengthens the matrix phase and reduces the contact between the matrix phase and the abrasive,so as to improve the wear resistance of the steel.
出处
《金属热处理》
CAS
CSCD
北大核心
2018年第1期57-61,共5页
Heat Treatment of Metals
关键词
高强高韧性马氏体钢
冲击磨料磨损
耐磨性
martensite steel with high strength and toughness
impact wear
wear resistance
