Forming Mechanism of Spot Segregation in High Sulfur Content Free Cutting Die Steel H11
摘 要
采用光学显微镜、扫描电子显微镜及能谱仪等分析了高硫易切削H11模具钢中点状偏析缺陷的形成机制。结果表明: 试验钢心部纵向带状偏析严重, 偏析带中有较多的与偏析带方向平行的MnS夹杂物; 部分MnS夹杂物内部包裹着Al2O3颗粒, 有些Al2O3颗粒之间形成了孔隙性缺陷; 点状偏析的形成与带状偏析及MnS夹杂物的偏聚有关, 点状偏析的严重程度随着带状偏析严重程度的增加而增大; MnS夹杂物被热酸腐蚀后形成宏观可见的点状偏析; 推荐采用稀土复合变质处理改善钢中的硫化物形态, 进而减少点状偏析缺陷。
Abstract
Forming mechanism of spot-segregation defect in high sulfur content die steel H11 was studied by means of optical microscopy, scanning electron microscopy and energy disperse spectroscopy. The results show that longtitudinal banded segregation in the core is serious and many MnS inclusions paralleled to the direction of segregated band can be observed in the segregated band. Part of the MnS inclusions contain Al2O3 particles, and porosity defects may form between Al2O3 particles. The formation of spot-segregation defect is related to banded segregation and segregation of MnS inclusions. Moreover, with the increase of the degree of banded segregation, the severity of spot-segregation is also increased. After hot acid corrosion, MnS inclusions were eroded leading to macroscopicly visible spot-segregation. It is recommended using rare earth compound modification to improve the shape of sulfide in high sulfur content steel, and then decrease spot segregation defect.
中图分类号 TG142.45 DOI 10.11973/jxgccl201612009
所属栏目 试验研究
基金项目
收稿日期 2015/8/24
修改稿日期 2016/9/19
网络出版日期
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备注胡艺耀(1990-), 男, 江西吉安人, 硕士研究生。
引用该论文: HU Yi-yao,MA Dang-shen,ZHOU Jian,CHI Hong-xiao,KANG Ai-jun,SU Jie. Forming Mechanism of Spot Segregation in High Sulfur Content Free Cutting Die Steel H11[J]. Materials for mechancial engineering, 2016, 40(12): 37~41
胡艺耀,马党参,周健,迟宏宵,康爱军,苏杰. 高硫易切削H11模具钢点状偏析的形成机制[J]. 机械工程材料, 2016, 40(12): 37~41
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【3】李知伦,马党参,迟宏宵,等.大型预硬化718塑料模具钢不同区域的抛光性能[J].机械工程材料,2015,39(2):60-66.
【4】赵建生, 乔学亮, 孙培祯, 等.预硬型塑料模具钢P20BSCa的切削性能[J].机械工程材料, 1996,20(1):36-38.
【5】聂辉文.Q235B钢热轧板带孔洞缺陷的形成原因[J].机械工程材料,2013,37(2):100-103.
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【7】王玉峰, 刘宗昌, 范文宝. H13 钢的带状组织及其消除方法[J]. 上海金属, 2006, 27(6): 39-41.
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【9】岳慎伟. Cr5大型支承辊用钢点状偏析与预备热处理研究[D].洛阳: 河南科技大学, 2014.
【10】林腾昌, 庞宗旭, 朱荣, 等. 20Mn5N 钢锭密集型探伤缺陷的解剖实验研究[J]. 铸造技术, 2012, 33(7): 804-806.
【11】季玮, 陈凯旋, 李富铮. 稀土对硫系易切削模具钢中硫化物形态的影响[J]. 江西冶金, 1986(1): 27-33.
【12】罗毅,吴晓春.预硬型塑料模具钢的研究进展[J].金属热处理,2008,32(12): 22-25.
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