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| 热处理工艺对黏结剂喷射3D打印17−4PH不锈钢微观组织与性能的影响 |
| Effects of Heat Treatment Process on Properties of 17-4PH Stainless Steel Produced by Binder Jet 3D Printing |
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| DOI：10.3969/j.issn.1674-6457.2023.03.014 |
| 中文关键词: 黏结剂喷射3D打印 17−4PH不锈钢 热处理工艺 力学性能 电化学腐蚀性能 |
| 英文关键词: binder jet 3D printing 17-4PH stainless steel heat treatment process mechanical properties electrochemical corrosion properties |
| 基金项目:广东省重点领域研发计划(2018B090905002) |
| Author Name | Affiliation | | LIN Hai-tao | Guangdong Key Laboratory for Advanced Metallic Materials Processing, South China University of Technology, Guangzhou 510641, China | | CHEN Ling | Guangdong Key Laboratory for Advanced Metallic Materials Processing, South China University of Technology, Guangzhou 510641, China | | FU Zhi-qiang | Guangdong Key Laboratory for Advanced Metallic Materials Processing, South China University of Technology, Guangzhou 510641, China | | CHEN Wei-ping | Guangdong Key Laboratory for Advanced Metallic Materials Processing, South China University of Technology, Guangzhou 510641, China |
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| 中文摘要: |
| 目的 探究热处理工艺对黏结剂喷射3D打印17−4PH不锈钢样品微观组织、力学性能及电化学腐蚀性能的影响规律，为BJ3DP技术制备综合性能良好的17−4PH不锈钢零件提供参考。方法 基于黏结剂喷射3D打印技术制备17−4PH不锈钢生坯，并将其固化、脱脂、烧结，得到烧结态样品，然后对烧结态样品进行热处理，热处理工艺为在1 040 ℃固溶热处理2 h，随后分别在410、480、550 ℃下热处理3 h后空冷至室温。对烧结态和热处理态样品进行金相试验、单向拉伸试验以及电化学腐蚀试验。 结果 经热处理后，试样在480 ℃时效热处理3 h时力学性能提升最为显著，其屈服强度由608 MPa提升至806 MPa，抗拉强度由1 159 MPa提升至1 245 MPa，伸长率由3.6%提升至13.6%。当时效热处理温度提升至550 ℃时，由于沉淀相的粗化，其力学性能有所下降;同时，电化学腐蚀性能中腐蚀电流密度(Jcorr)减小，腐蚀电位(Ecorr)增大，电荷转移电阻(Rct)增大，出现明显的钝化区。结论 黏结剂喷射3D打印17−4PH不锈钢经热处理后力学性能得到提升，试样在480 ℃时效热处理3 h时力学性能提升最为显著，优于商用热轧17−4PH不锈钢，电化学腐蚀性能与商用热轧17−4PH不锈钢电化学腐蚀性能水平相当。 |
| 英文摘要: |
| The work aims to explore the effects of heat treatment on microstructure, mechanical properties and electrochemical corrosion properties of 17-4PH stainless steel samples produced by binder jet 3D printing to provide references for preparation of 17-4PH stainless steel parts with good comprehensive properties by BJ3DP technology.Based on binder jet 3D printing, a 17-4PH stainless steel green part was prepared, and then cured, degreased, sintered to obtain as-sintered samples. Then, the as-sintered samples were subject to solution heat treatment at 1 040 ℃ for 2 h and hot treatment at 410, 480, 550 ℃ for 3 h and then cooled naturally to the room temperature. Finally, the as-sintered and hot treated samples were subject to metallographic test, uniaxial tensile test and electrochemical corrosion test. The results showed that after the heat treatment, the mechanical properties of the samples were improved most significantly when aging at 480 ℃ for 3 h. The yield strength increased from 608 MPa to 806 MPa, the tensile strength increased from 1 159 MPa to 1 245 MPa, and the elongation increased from 3.6% to 13.6%. When the aging temperature was increased to 550 ℃, the mechanical properties of the precipitated phase decreased due to coarsening of the precipitated phase. The corrosion current density (Jcorr) decreased, the corrosion potential (Ecorr) increased, and the charge transfer resistance increased, and the passivation was obviously. It is concluded that the mechanical properties of 17-4PH stainless steel produced by binder jet 3D printing are improved after heat treatment. The mechanical properties of the samples are improved most significantly at 480 ℃ for 3 h, which is superior to commercial hot rolled 17-4PH stainless steel. In terms of electrochemical corrosion resistance, it is equivalent to commercial hot rolled 17-4PH stainless steel. |
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