表面喷丸及退火处理对Fe-30Mn-3Al-3Si TWIP钢组织与性能的影响  

Effect of Surface Shot Peening and Annealing Treatment on the Microstructure and Properties of Fe-30Mn-3Al-3Si TWIP Steel

作　　者：王坤[1] 王邦林 廖兴利 卢承宏 蔡承宇[1] 林继兴[1,3] 童先 王文权[1,4] WANG Kun;WANG Banglin;LIAO Xingli;LU Chenghong;CAI Chengyu;LIN Jixing;TONG Xian;WANG Wenquan(Zhejiang Industry&Trade Vocational College,Wenzhou 325026,China;Wenzhou Taichang Pylon Manufacturing Co.,Ltd.,Wenzhou 325013,China;School and Hospital of Stomatology,Wenzhou Medical University,Wenzhou 325035,China;School of Materials Science and Engineering,Jilin University,Changchun 130022,China)

机构地区：[1]浙江工贸职业技术学院,浙江温州325026 [2]温州泰昌铁塔制造有限公司,浙江温州325013 [3]温州医科大学口腔医学院,浙江温州325035 [4]吉林大学材料科学与工程学院,吉林长春130022

出　　处：《材料保护》2024年第5期61-67,共7页Materials Protection

基　　金：中国博士后科学基金资助项目(2020M682059);温州市重大科技创新攻关项目(ZZG2023013)。

摘　　要：为实现强韧化,对Fe-30Mn-3Al-3Si TWIP钢进行了表面喷丸及退火热处理。采用金相显微镜、X射线衍射仪和透射电子显微镜等手段分析了喷丸以及喷丸结合退火处理对TWIP钢显微组织结构的影响,并利用显微维氏硬度计和万能材料试验机对原始样品、喷丸以及喷丸结合退火处理样品的硬度分布、力学性能及加工硬化行为进行了研究。分析结果表明,喷丸可在TWIP钢表面引起强烈的塑性变形,并形成包含60~100 nm大小的位错胞块的强烈形变层和包含微纳尺度形变孪晶结构的过渡层。该纳米-微米尺度的晶粒尺寸梯度结构可以将TWIP钢表面强烈形变层的硬度显著提升至366 HV0.1,并在残余压应力联合作用下使试样的屈服强度提升至485 MPa,均远高于初始样品的对应值。但受喷丸引起的表面粗糙和强烈形变层纳米晶塑性低的影响,其断后延伸率仅为41.8%。退火处理后,喷丸样品中的形变组织发生回复与再结晶,其中强烈形变层位置的再结晶晶粒尺寸为1~3μm,硬度也降低至215 HV0.1。所形成的微米-微米尺度晶粒尺寸梯度结构试样的屈服强度降低至261 MPa,但延伸率增加至65.3%。晶粒尺寸梯度结构有助于增加TWIP钢屈服与抗拉强度,但不利于延伸率的提升。Surface shot peening and annealing heat treatment were applied to the Fe-30Mn-3Al-3Si TWIP steel to achieve toughening.The effects of shot peening and shot peening combined with annealing on the microstructure of TWIP steel were analyzed by means of metallurgical microscopy,X-ray diffraction and transmission.The hardness distribution,mechanical properties and work-hardening behaviors of the original samples,shot peened and shot peened+annealed samples were analyzed by using the micro-Vickers hardness tester and universal material testing machine.Results showed that the strong plastic deformation on the surface of TWIP steels was induced by shot peening,which resulted in the formation of highly deformed layer containing dislocation clusters of 60~100 nm size and transition layer containing micro and nanoscale deformation twin structures.This nano-micron scale grain size gradient structure could significantly increase the hardness of the highly deformed layer on the surface of TWIP steels to 366 HV0.1.Under the combined action of residual compressive stress,the yield strength of the sample increased to 485 MPa,which was much higher than the corresponding value of the initial sample.However,its fracture elongation was only 41.8%due to the surface roughness induced by shot peening and the nanocrystals with low plasticity in the highly deformed layer.After the annealing treatment,the deformed microstructure in the shot peened sample underwent recovery and recrystallization,with recrystallized grain sizes ranging from 1 to 3μm in the strongly deformed layer position,and the hardness also decreased to 215 HV0.1.The yield strength of the formed micron-micron scale grain size gradient structure specimen declined to 261 MPa,but the elongation was improved to 65.3%.Besides,the grain size gradient structure was promotable to enhance the yield and tensile strength of TWIP steel,but was not favorable for the improvement of elongation.

关 键 词：喷丸 退火 形变孪晶 位错 Fe-30Mn-3Al-3Si TWIP钢 梯度结构 

分 类 号：TG580.6924[金属学及工艺—金属切削加工及机床]