Transactions of Materials and Heat Treatment

Title：Microstructure and properties of stainless steel shell 304 in the ironing process

Authors： Bai Jianxiong Chen Xianchao Wang Jiangnan Yang Yuanzheng Xie Zhiwei Xiao Xiaoting

Unit： Guangdong University of Technology

KeyWords： stainless steel shell 304 ironing microstructure vivtorinox hardness residual stress

ClassificationCode：

year,vol(issue):pagenumber：2016,41(1):32-37

Abstract：

Microstructure and properties of stainless steel shell 304 for each-stage ironing were studied by means of XRD, microstructure, Vivtorinox hardness, cutting ring residual stress. The results show that, with the increasing amount of deformation and thinning, the deformation on the cylinder wall induces α′-martensite to increase quickly. The α′-martensite phase is dominant after ironing without the hcp structure of ε-martensite. The more elongate in microstructure of grains shows, the more lath martensite is. After the third-stage ironing, lath martensite presents a certain direction, and the grains are elongated as fibrous tissue. The hardness on the vertical wall increases from 323.7 HV to 400.8 HV. Tangential residual stress of the parts decreases by 48.5% from the deep drawing to the first-stage ironing. But the second-stage ironing and the third-stage ironing increase in the tangential residual stress up to 23%, 16.7% respectively. With the deep drawing of the stainless steel shell 304, the strength increases, the ductility decreases, and the tangential residual stress increases gradually. The defects including bottom off and longitudinal crack are likely to happen. So the degree of deformation and the amount of drawing passes should be strictly controlled in the process design.

Funds：

广东省战略性新兴产业项目（2012A090100014）

白建雄（1990-），男，硕士研究生

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