首页|La-Ce对GCr15轴承钢中夹杂物的改质效果及机理

La-Ce对GCr15轴承钢中夹杂物的改质效果及机理

扫码查看
为了探究稀土La-Ce对GCr15轴承钢中夹杂物的改质效果,采用了公称容量为1kg的高温管式炉,冶炼了 6炉不同La-Ce含量的GCr15轴承钢钢锭,借助光学显微镜、扫描电镜等表征手段,并结合FactSage热力学软件对不同La-Ce含量的GCr15钢中夹杂物的转化规律进行研究.结果表明,未添加La-Ce的GCr15轴承钢中典型夹杂物为不规则状的Al2O3和MnS,La-Ce的添加会将其改质为类型较为复杂的稀土夹杂物,随着La-Ce含量的提高,1 600 ℃下钢中夹杂物的转化规律为 A12O3→REA1O3→ RE2O3→ RE2O2S RE2O2S+RExSy(RE为La-Ce).当 La-Ce含量为96× 10-6时,Al2O3和MnS均被改质为球状的RE2O2S·RExSy复合稀土夹杂物,钢中夹杂物的数量处于较低水平且夹杂物的整体形貌控制较好.
Modification Effect and Mechanism of La-Ce on Inclusions in GCr15 Bearing Steel
In order to investigate the effect of Rare Earth La-Ce on the modification of inclusions in GCr15 bearing steel,a high-temperature tube furnace with a nominal capacity of 1 kg was used to smelt 6 heats of GCr15 bearing steel ingots with different La-Ce contents.Characterization methods such as optical microscopy and scanning electron microscopy were used,and the transformation law of inclusions in GCr15 steel at different La-Ce contents was studied using FactSage ther-modynamic software.The results show that the typical inclusions in GCr15 bearing steel without adding La-Ce are Al2O3 and MnS,and the addition of La-Ce will modify it to more complex Rare Earth inclusions.With the increase of La-Ce con-tent,the transformation law of inclusions in steel at 1 600 ℃ is Al2O3 → REAlO3 → RE2O3 → RE2O2S →RE2O2S+RExSy(RE is La、Ce).With the increase of La-Ce content,the density of inclusions and the average aspect ratio in the steel both decrease first and then increase.When the La-Ce content is 96×10-6,Al2O3 and MnS were both transformed into spherical RE2O2S·RExSy composite rare earth inclusions.The number of inclusions in the steel was at a low level and the overall morphology of the inclusions was well controlled.

GCr15 Bearing SteelRare EarthInclusion ModificationThermodynamic Calculations

吴翔宇、董丙成、王梓菲、田钱仁、付建勋

展开 >

上海大学材料科学与工程学院先进凝固技术中心,省部共建高品质特殊钢冶金与制备国家重点实验室,上海 200444

山钢股份莱芜分公司技术中心,莱芜 271104

GCr15轴承钢 稀土 夹杂物改质 热力学计算

2024

特殊钢
中国金属学会特殊钢分会 大冶特殊钢股份有限公司

特殊钢

影响因子:0.345
ISSN:1003-8620
年,卷(期):2024.45(2)
  • 20