| Effect of Rare Earth Composite Modification on Microstructure and Properties of a New Cast Hot-Work Die Steel |
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| 引用本文： | 关庆丰,方建儒,姜启川,王树奇. Effect of Rare Earth Composite Modification on Microstructure and Properties of a New Cast Hot-Work Die Steel[J]. 中国稀土学报(英文版), 2003, 21(3): 368-371 |
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| 作者姓名： | 关庆丰 方建儒 姜启川 王树奇 |
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| 作者单位： | DepartmentofMaterialsScienceandEngineering,JilinUniversity,Changchun130025,China |
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| 基金项目： | ProjectsupportedbytheNationalNaturalScienceFoundationofChina ( 5 97710 0 3 )，NationalDevelopmentPlanCommitteeofChina ( [1999] 3 17) |
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| 摘 要： | The effects of RE modification on structure and the properties of a new cast hot-work die (CHD) steel were investigated. The grains of the CHD steel are refined by RE modification. With the increase of RE addition, both grain size and inclusion amount are reduced. Appropriate amount of RE results in decrease in inclusion amount and formation of spheroidal inclusions uniformly - distributed in steel, so that the morphology and distribution of inclusions are improved. RE composite modification favors the formation of bainite, austenite and fine lath martensite with dense dislocation. When the residual RE content reaches 0.02 %, no obvious changes in strength and hardness are found, while fracture toughness and threshold of fatigue crack growth are increased. The impact toughness, elongation and reduction of cross sectional area are increased by a factor of two, and thermal fatigue resistance is also improved.
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| 关 键 词： | 金属材料 修改 铸造高温模具钢 热疲劳 稀土 微观结构 |
Effect of Rare Earth Composite Modification on Microstructure and Properties of a New Cast Hot-Work Die Steel |
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| Guan Qingfeng ,Fang Jianru,Jiang Qichuan,Wang Shuqi. Effect of Rare Earth Composite Modification on Microstructure and Properties of a New Cast Hot-Work Die Steel[J]. Journal of Rare Earths, 2003, 21(3): 368-371 |
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| Authors: | Guan Qingfeng Fang Jianru Jiang Qichuan Wang Shuqi |
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| Affiliation: | Guan Qingfeng 1*,Fang Jianru,Jiang Qichuan,Wang Shuqi |
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| Abstract: | The effects of RE modification on structure and the properties of a new cast hot work die (CHD) steel were investigated. The grains of the CHD steel are refined by RE modification. With the increase of RE addition, both grain size and inclusion amount are reduced. Appropriate amount of RE results in decrease in inclusion amount and formation of spheroidal inclusions uniformly-distributed in steel, so that the morphology and distribution of inclusions are improved. RE composite modification favors the formation of bainite, austenite and fine lath martensite with dense dislocation. When the residual RE content reaches 0.02%, no obvious changes in strength and hardness are found, while fracture toughness and threshold of fatigue crack growth are increased. The impact toughness, elongation and reduction of cross sectional area are increased by a factor of two, and thermal fatigue resistance is also improved. |
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| Keywords: | metal materials modification cast hot work die steel thermal fatigue rare earths |
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