| 引用本文: | 郑志军,周驰宇,王文熊,高岩,李浩,陈忠斌.表面双尺度结构对304不锈钢的耐磨性和成形性的影响[J].中国表面工程,2018,31(6):14~21 |
| ZHENG Zhijun,ZHOU Chiyu,WANG Wenxiong,GAO Yan,LI Hao,CHEN Zhongbin.Effects of Surface Bimodal Microstructure on Wearing Resistance and Formability of 304 Stainless Steel[J].China Surface Engineering,2018,31(6):14~21 |
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| 表面双尺度结构对304不锈钢的耐磨性和成形性的影响 |
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郑志军1, 周驰宇1, 王文熊1, 高岩2, 李浩3, 陈忠斌4
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1.华南理工大学 机械与汽车工程学院, 广州 510641;2.华南理工大学 材料科学与工程学院, 广州 510641;3.广东出入境检验检疫局, 广州 510642;4.佛山市顺德区帝伟不锈钢制品有限公司, 顺德 528325
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| 摘要: |
| 首先利用高能喷丸工艺对304不锈钢进行表面纳米化处理，再通过退火处理在表面获得双尺度结构，从而实现耐磨性-成形性间的平衡。通过金相和X射线衍射分析来表征细化层的微观结构，通过横截面的硬度测量和耐磨性实验来表征不锈钢的耐磨性，利用杯突实验和成形极限（FLD）实验来表征不锈钢的成形性。结果表明，0.3 MPa-6 min表面喷丸可以获得平均晶粒尺寸约为36 nm，平均硬度为353 HV0.2，形变诱发马氏体质量分数50.2%，厚度约为125 μm的细化层。表面喷丸纳米化不锈钢的耐磨性显著提高，但成形性明显下降。表面喷丸纳米化+650 ℃退火30 min可在不锈钢表面获得双尺度结构的细化层，其中粗晶部分的平均晶粒尺寸约为1~2 μm，体积比约66%；细晶部分的平均晶粒尺寸约为58 nm，体积比为34%。这种双尺度结构的表面细化层兼具高耐磨性和高成形性的特性。 |
| 关键词: 不锈钢 喷丸 纳米晶 双尺度结构 耐磨性 成形性 |
| DOI：10.11933/j.issn.1007-9289.20180620002 |
| 分类号:TG668 |
| 基金项目:广东省科技计划项目（2015A010105006） |
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| Effects of Surface Bimodal Microstructure on Wearing Resistance and Formability of 304 Stainless Steel |
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ZHENG Zhijun1, ZHOU Chiyu1, WANG Wenxiong1, GAO Yan2, LI Hao3, CHEN Zhongbin4
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1.School of Mechanical & Automotive Engineering, South China University of Technology, Guangzhou 510641, China;2.School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China;3.Guangdong Inspection and Quarantine Technology Center, Guangzhou 510642, China;4.Shunde Diwei Stainless Steel Products Co., LTD., Shunde 528325, China
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| Abstract: |
| The 304 stainless steel (SS) first underwent surface nanocrystallization treatment by high energy shot peeing, and was subsequently annealed to achieve a wearability-formability balance through bi-modal microstructure (BMS) tailoring. The microstructure of specimen was characterized by optical micrograph and X-ray diffraction (XRD). The wear resistance was estimated by means of hardness measurement on the cross-section of specimen and the abrasion resistance test. The formability was measured through the cupping test and forming limit diagrams (FLD). Results show that the surface nano-structured layer on SS with about 125 μm thickness is obtained by shot peening under 0.3 MPa for 6 min, in which the average grain size and hardness are about 36 nm and 353 HV0.2, respectively, and the volume fraction of the deformation-induced martensite is 50.2%. This nano-structured surface offers higher wearing resistance but lower formability. The annealing of surface nanocrystalline SS at 650℃ for 30 min produces the BMS consisting 66% coarse grains with an average size of 1~2 μm and 34% nanocrystalline grains with an average size of 58 nm. Consequently, the surface BMS SS presents high wearing resistance and high formability simultaneously. |
| Key words: stainless steel shot peening nanocrystalline bi-modal microstructure wear resistance formability |
