Kostin V. The influence of structural - phase composition of weld metal low alloys steels on stability their mechanical properties

Українська версія

Thesis for the degree of Candidate of Sciences (CSc)

State registration number

0404U004072

Thesis Registration Form

0404U004072.pdf

Applicant for

Specialization

  • 05.16.01 - Металознавство та термічна обробка металів

04-11-2004

Specialized Academic Board

Д26.232.01

Essay

The thesis is devoted to a research of regularities of formation of a structure AF and installation of the reasons of instability of properties of welded metals with AF on HSLA steels of a type 10ХСНД. Is shown, that there are two various mechanisms of formation AF. Which one of is connected with a character of a microscopic chemical heterogeneity alloys elements in a rigid solution, and other - with inclusions. Around of some types of inclusions (alumosilicates, size 0,4 … 0,8 microns) are formed areas of a chemical heterogeneity with an increased content Ni and Mn. The formation of such areas around of inclusions promotes formation of AF. The reasons of instability of properties of seams with a structure ИФ are established. The paths of a raise of shock properties of welded metals HSLA steels at low temperatures are offered.

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Files

AREF.doc

ДИСЕРТАЦІЯ_ДИСК.doc

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