| 引用本文: | 李福泉,孟祥旭,章碧成,冯时.不同热处理制度下激光增材制造12CrNi2钢组织研究[J].材料科学与工艺,2019,27(5):14-20.DOI:10.11951/j.issn.1005-0299.20180370. |
| LI Fuquan,MENG Xiangxu,ZHANG Bicheng,FENG Shi.Effects of heat treatment on microstructure of 12CrNi2 steel fabricated by laser additive manufacturing[J].Materials Science and Technology,2019,27(5):14-20.DOI:10.11951/j.issn.1005-0299.20180370. |
|
| 摘要: |
| 采用激光增材制造技术制备12CrNi2合金钢核电应急柴油机凸轮轴可以明显降低产品研发周期，优化产品结构.本研究采用光学显微镜(OM)、扫描电子显微镜(SEM)、X射线衍射仪(XRD)和电子万能试验机对激光增材制造12CrNi2合金钢热处理前后的组织和力学性能进行了研究.微观组织观察发现，试样存在带状特征和柱状晶形貌，圆弧带间为致密的冶金结合，顶部由于无后一道的重熔热作用，柱状晶形貌十分显著.沉积态组织主要由铁素体组成，试样不同部位的铁素体形貌存在一定的差异.经退火处理后，铁素体边界出现大量白色粒状析出物，延伸率显著提高，达到22.9%.经淬火及不同温度回火处理后，带状特征和柱状晶形貌消除，得到马氏体及其回火组织，抗拉强度达到1 000 MPa.与沉积态抗拉强度831 MPa相比，热处理态试样的抗拉强度显著提高.经固溶时效处理后，晶粒明显粗化. |
| 关键词: 激光增材制造 12CrNi2合金钢 热处理 组织 拉伸性能 |
| DOI：10.11951/j.issn.1005-0299.20180370 |
| 分类号:TG161 |
| 文献标识码:A |
| 基金项目:国家重点研发计划项目(2016YFB1100200). |
|
| Effects of heat treatment on microstructure of 12CrNi2 steel fabricated by laser additive manufacturing |
|
LI Fuquan, MENG Xiangxu, ZHANG Bicheng, FENG Shi
|
|
(State Key Laboratory of Advanced Welding and Joining(Harbin Institute of Technolog), Harbin 150001, China)
|
| Abstract: |
| Laser additive manufauturing can significantly reduce the product development cycle and optimize the product structure of 12CrNi2 alloy steel nuclear power emergency diesel engine camshaft. In this study, the microstructure and mechanical properties of 12CrNi2 alloy steel before and after heat treatment were investigated through optical microscopy(OM), scanning electron microscopy(SEM), X-ray diffractometry(XRD), and electronic universal testing machine. Microscopic observation showed that the sample had banded features and columnar morphology. The circular arc bands were connected by dense metallurgical bands and the top of the sample had significant columnar morphology due to the lack of remelting heat treatment. The microstructure of the deposited state was mainly consisted of ferrite, whose morphologies were different at different parts of the sample. After annealing, a large number of bright granular precipitates appeared on the ferrite boundary, and the elongation was greatly improved(22.9%). After quenching and tempering at different temperatures, the banded features and the columnar morphology were eliminated, and the martensite and its tempering structures were obtained with the tensile strength reaching 1 000 MPa. Compared with the tensile strength of the deposited state of 831 MPa, the tensile strength was greatly improved after heat treatment. After solid solution aging treatment, the grains were significantly coarsened. |
| Key words: laser additive manufacturing 12CrNi2 alloy steel heat treatment microstructure tensile property |
