陈书浩，王新华
,
何肖飞
,
曾建华
,
王万军
钢铁
研究了攀钢新钢钒公司生产帘线钢72A过程中钢中氮含量变化对钢中TiN夹杂析出的影响。研究发现，随着钢中氮含量的升高，钢中析出的TiN夹杂数量变多，尺寸变大。热力学研究表明，在帘线钢中TiN一般只能在固相区形成，考虑元素偏析对凝固前沿元素富集的影响，凝固过程中TiN能在固液两相区析出。在帘线钢生产过程中，为了控制钢中TiN的析出，除了控制钛含量，控制钢中氮含量及氮偏析更加重要。理论计算结果表明，当钢中钛的质量分数控制在0.0003%~0.0005%区间时，将钢中氮的质量分数控制在0.0017%~0.0029%区间内能显著降低乃至杜绝帘线钢中TiN的析出。攀钢将帘线钢中钛、氮的质量分数分别控制在0.0005%以下和0.002%以下，显著减少了钢中TiN的析出，个别炉次中没有发现尺寸大于2μm的TiN夹杂。
关键词:
帘线钢
,
TiN
,
precipitation
,
solidification
,
segregation
MA You-ping
,
LI Xiu-lan
,
WANG Cheng-hui
,
LU Lu
钢铁研究学报(英文版)
A high-manganese austenitic steel matrix (Mn13) composite reinforced with TiN ceramic particles was synthesized by means of Vacuum-Evaporation Pattern Casting (V-EPC). The composite microstructure and interface bonding of TiN/matrix were analyzed utilizing optical microscope (OM) and X-ray diffraction (XRD). The effects of different volume fraction of TiN on impact wear resistance were evaluated by MLD-10 impact wear test.The results showed that TiN was evenly distributed in composite layer and had a good interface bonding with matrix when the volume fractions of TiN were 27% and 36%, respectively. However, cast defects and TiN agglomeration occurred when the TiN volume fraction increased to 48%. Compared with high-manganese austenitic steel (Mn13), the impact wear resistance of the TiN-reinforced composite is better. In small impact load conditions, composite layer can effectively resist abrasives wear and TiN particles played an important role in determining impact wear resistance of composite layer. In large impact load, the synergistic roles of spalling of TiN particles and the increase of work hardening of Mn13 based material are responsible for impact wear resistance.
关键词:
high manganese steel
,
TiN
,
impact wear
,
V-EPC cast-penetration
