Ways to Improve the Quality of Die Steel 5KhNM

3rd International Scientific and Technical Conference on Scientific and Technical Progress in Ferrous Metallurgy - SATPIFM 2017

Efimov, S.V.^1 ; Malykhina, O.^1 ; Pavlova, A.G.^1 ; Milyuts, V.G.^2 ; Tsukanov, V.V.^2 ; Vikharev, V.V.^2

OMZ-Special Steels LLC, St-Petersburg

RU-196650, Russia^1

Federal State Unitary Enterprise, Central Research Institute of Structural Materials Prometey, 49 Shpalernaya Street, St-Petersburg

RU-191015, Russia^2

关键词: Deoxidation;    Die steels;    Fractographic examinations;    Hydrogen contents;    Non-metallic inclusions;    Titanium content;    X-ray microprobe analysis;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/287/1/012003/pdf
DOI  :  10.1088/1757-899X/287/1/012003

来源: IOP

【 摘 要 】

There was performed an analysis of influence of the deoxidation technology, hydrogen content and high concentration of titanium in steel 5KhNM (Rus. "5XHM") on quality of die blanks, evaluated based on the results of the ultrasonic test. The fractographic examinations of fractures and the X-ray microprobe analysis of chemical composition of non-metallic inclusions were conducted, the evaluation of macro- and micro-structure of a die blank with high titanium content was performed. It is demonstrated that defects of dies from steel 5KhNM (Rus. "5XHM") are cracks from merged flakes and micro-flakes; in most cases large concentrations of sulphides appeared to be hydrogen collectors for formation of flakes and micro-flakes.