深冷处理对高碳高合金工具钢SDC99回火过程碳配分的影响*

doi:10.11901/1005.3093.2016.380

材料研究学报

2016, Vol. 30

Issue (11): 801-810 DOI: 10.11901/1005.3093.2016.380

本期目录 | 过刊浏览

深冷处理对高碳高合金工具钢SDC99回火过程碳配分的影响*

谢尘^1,^2,³,周龙梅^1,^2,³,闵娜^1,^2,³,吴晓春^1,^2,³

1. 上海大学省部共建高品质特殊钢冶金与制备国家重点实验室上海 200072
2. 上海大学上海市钢铁冶金新技术开发应用重点实验室上海 200072
3. 上海大学材料科学与工程学院上海 200072

Effect of Deep Cryogenic Treatment on Carbon Partition of Tempered High Carbon High Alloy Tool Steel SDC99

Chen XIE^1,^2,³,Longmei ZHOU^1,^2,³,Na MIN^1,^2,³,Xiaochun WU^1,^2,^3,^**

1. State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200072, China
2. Shanghai Key Laboratory of Advanced Ferrometallurgy, Shanghai University, Shanghai 200072, China
3. School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China

引用本文:

谢尘,周龙梅,闵娜,吴晓春. 深冷处理对高碳高合金工具钢SDC99回火过程碳配分的影响*[J]. 材料研究学报, 2016, 30(11): 801-810.
Chen XIE, Longmei ZHOU, Na MIN, Xiaochun WU. Effect of Deep Cryogenic Treatment on Carbon Partition of Tempered High Carbon High Alloy Tool Steel SDC99[J]. Chinese Journal of Materials Research, 2016, 30(11): 801-810.

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摘要:

采用内耗和三维原子探针结合硬度测试研究了深冷处理对高碳高合金工具钢SDC99不同回火温度下组织和碳偏聚情况的影响。结果表明: 深冷处理显著提高工具钢SDC99的硬度, 深冷处理试样较淬火试样硬度提高2HRC, 深冷处理并200℃回火试样比常规热处理试样硬度提高1.5HRC; 深冷处理后碳原子与位错的相互作用增强, 内耗的Snoek-Kê-K?ster (SKK)峰强度提高, 位错密度增加; 深冷处理后碳原子的偏聚程度加剧, 淬火、深冷、淬火并200℃回火、深冷并200℃回火试样中富碳相的碳浓度峰值分别为2%、8%、8%和15%(原子分数)。

关键词 ：金属材料, 碳配分, 三维原子探针, 深冷处理, 内耗

Abstract：

The effect of deep cryogenic treatment on microstructure and carbon partition behavior of high carbon high alloy tool steel SDC99, which had been tempered at different temperatures was investigated by three-dimensional atom probe and internal friction combined with the hardness testing. The results show that the hardness of SDC99 steel significantly increased after deep cryogenic treatment. The hardness of SDC99 sample after deep cryogenic treatment is 2 HRC higher than the quenching sample, while the hardness of sample subjected to deep cryogenic treated and then tempered at 200^oC is 1.5 HRC higher than the conventional heat treated sample. The enlargement of the Snoek-Kê-K?ster (SKK) peak height indicates stronger interaction between the interstitial carbon atoms and dislocations after deep cryogenic treatment. In comparison to the merely quenched sample, the dislocation density of the quenched and deep cryogenic treated sample increased by 17%. The extent of carbon segregation was enhanced significantly after deep cryogenic treatment. The peak of the carbon atom concentration in carbon-rich regions of SDC99 steel after quenched, deep cryogenic treated, quenched and then tempered at 200℃, deep cryogenic treated and then tempered at 200^oC are 2%, 8%, 8% and 15% (atomic fraction) respectively.

Key words： metallic materials carbon partition three-dimensional atom probe deep cryogenic treatment internal friction

收稿日期: 2016-07-05

基金资助:* 国家自然科学基金51171104和51301100资助项目

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表1 SDC99钢热处理和深冷处理工艺

图1 SDC99钢经不同工艺处理后的硬度

图2 SDC99钢经Q工艺后的马氏体TEM像: (a) 明场相; (b) 暗场相和衍射斑点

图3 SDC99钢经QT 200工艺后的马氏体TEM像: (a) 明场相; (b) 暗场相和衍射斑点

图4 SDC99钢经DCT工艺后的马氏体TEM像: (a) 明场相; (b) 暗场相和衍射斑点

图5 SDC99钢经DCT 200工艺后的马氏体TEM像: (a) 明场相; (b) 暗场相和衍射斑点

图6 SDC99钢不同处理后的温度-内耗谱分峰

表2 SDC99钢不同工艺处理试样内耗峰对应的参数

图7 SDC99钢不同处理后的SKK峰

表3 SDC99钢不同工艺处理试样的位错密度

图8 淬火和深冷态SDC99钢试样的XRD谱

图9 (a) Q试样中碳原子的空间分布图(试样尺寸为38 nm×38 nm×250 nm); (b) 截取的box中碳的浓度曲线(box尺寸为?10 nm×40 nm); (c) 碳浓度为4%, 4.5%, 5%的等浓度面分布图

图10 (a) DCT试样中碳原子的空间分布图(试样尺寸为76 nm×73 nm×185 nm); (b) 截取的box中碳的浓度曲线(box尺寸为?10 nm×50 nm); (c) 碳浓度为4%, 4.5%, 5% (原子分数) 的等浓度面分布图

图11 (a) QT 100试样中碳原子的空间分布图(试样尺寸为84 nm×83 nm×188 nm); (b) 碳浓度为4%的等浓度面分布图; (c) (d) 截取的box中碳、铬的浓度曲线 (box尺寸为?10 nm×40 nm)

图12 (a) DCT 100试样中碳原子的空间分布图(试样尺寸为78 nm×78 nm×269 nm); (b) 碳浓度为4%(原子分数)的等浓度面分布图; (c) (d) 截取的box中碳、铬的浓度曲线 (box尺寸为?10 nm×40 nm)

图13 (a) QT 200试样中碳原子的空间分布图(试样尺寸为50 nm×49 nm×155 nm); (b) (c) 截取的区域中碳、铬的浓度曲线 (区域尺寸为?10 nm×20 nm)

图14 (a) DCT 200试样中碳原子的空间分布图(试样尺寸为76 nm×75 nm×243 nm); (b) (c) 截取的区域中碳、铬的浓度曲线 (区域尺寸为?10 nm×40 nm)

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