Transactions of Materials and Heat Treatment

Title：Analysis on crack failure of plastic shell mold for S136 steel

Authors： Jin Linkui Zhou Bin Ou Hailong Liu Biao Mi Yong

Unit： Guangdong Dongguan Quality Supervision Testing Center National Mold Product Quality Supervision and Inspection Center Dongguan Huimei Mould Manufacturing Co. Ltd.

KeyWords： mold cracking stress concentration banded carbide flake carbide network carbide intergranular cracking

ClassificationCode：TG147

year,vol(issue):pagenumber：2018,43(10):122-128

Abstract：

The plastic shell mold of S136 steel cracks early during application. In order to find the cause of mold cracking failure, the chemical composition, fracture morphology and microstructure of mold failure parts were detected and analyzed by direct reading spectrograph, digital Rockwell hardness tester, optical microscope, scanning electron microscope and energy spectrometer. The test results show that the main reason for mold cracking is that there is no Rangle at the rightangled step of the mold working face, and the mold withstands the impact load during application resulting in stress concentration and cracking at the rightangled step. Thus, the banded carbide in the matrix stucture of the mold material is severe, which reduces the transverse tensile strength of the mold material. At the same time, the uneven stress distribution between banded carbides and the influence of coarse needlelike tempered martensite make the internal cracks of intergranular cracking occur in the microstructure, and the material strength is greatly reduced. After finding the cause of mold cracking failure, the existing problems were optimized and improved. Thus, the service life of the improved mold is greatly improved, and the economic benefits of company is effectively increased.

Funds：

广东省科技计划创新项目（509197766117）

金林奎(1966-)，男，硕士，高级工程师，E-mail：jinlinkui@foxmail.com

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