Influence of rare earth modifier on the nonmetallic inclusion morphology and size distribution about hot stamping
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摘要: 利用光学显微镜、扫描电镜等手段研究了稀土变质剂对1 500 MPa级热冲压成型用钢夹杂物形貌、尺寸和分布状态的影响，并在此基础上对钢的显微组织和常温塑性进行了对比评价。结果显示：添加稀土变质剂后，铸坯中心偏析现象消失；与未进行变质剂处理的钢相比，粗大的D类质点夹杂物显著降低，但D类夹杂的密度并未减少；产品的显微组织得到有效细化，常温塑性显著提高，对材料性能提升效果显著。Abstract: The influence of rare earth modifier on nonmetallic inclusion morphology and size distribution of 1500 MPa grade hot stamping steel were investigated by optical microscope and scanning electron microscope. And the microstructure and plastic property of resulted steel at room temperature were compared. The results showed that macro segregation disappeared in the rare earth modifier treated steel. After rare earth modifier treatment, the size of D-type particle inclusion decreased obviously, however, the density of inclusion kept increasing. With the rare earth modifier treatment, the microstructure was refined apparently and the plastic property at room temperature was improved.
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Key words:
- hot stamping steel /
- rare earth /
- nonmetallic inclusion /
- morphology /
- size
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图 2 夹杂物形貌及分布状态
(a) 1#钢铸坯；(b) 2#钢铸坯；(c) 1#钢热轧板；(d) 2#钢热轧板
Figure 2. Morphology and distribution of nonmetallic inclusion in slab and hot-rolled plate
图 3 2#钢种夹杂物随热变形行为的演化
(a)、 (b) 铸坯中夹杂物；(c)、 (d) 热轧钢板中夹杂物
Figure 3. SEM observation and energy pattern of nonmetallic inclusion in 2# steel
图 4 稀土变质剂对D类夹杂物尺寸的影响机理示意
Figure 4. Mechanism for the size change of D-type inclusion by rare earth modifier treatement
图 5 稀土变质剂对连退钢板显微组织和塑性的影响
(a) 1#钢显微组织；(b) 2#钢显微组织；(c) 1#钢折弯；(d) 2#钢折弯
Figure 5. Influence of rare earth modifier on the microstructure and plastic property
表 1 试验钢的主要化学成分
Table 1. Main chemical compositions of experimental steels
% 序号 C Mn S P Si N Als Cr Ti Ca La Ce 1# 0.24 1.30 0.0020 0.0110 0.26 0.0038 0.047 0. 21 0.037 0.0020 2# 0.22 1.35 0.0030 0.0140 0.28 0.0040 0.040 0.20 0.032 0.0021 0.0010 0.0016 
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表 2 稀土变质剂对热轧钢卷非金属夹杂物类型和评级的影响
Table 2. Effect of rare earth modifier on the type and grade of nonmetallic inclusion
钢种 夹杂物评级/级 A B C D-细系 D-粗系 Ds 1# 1.0 0.5 0.5 1.5 2.0 1.0 2# 0.5 0.5 1.0 2.0 0.5 0
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