Tensile strength assessment method of high-alloy heat resistant steel

Abstract

A method for evaluating the tensile strength of high-alloy heat-resistant steel, the method comprising: obtaining high-alloy heat-resistant steel with a cast test block; obtaining the Brookfield hardness detection value of the high-alloy heat-resistant steel with cast test block; Regression fitting analysis was carried out on the corresponding relationship between the distributed hardness value and the tensile strength value, and the regression relationship between the tensile strength and the hardness was obtained. This relationship can be used to evaluate the tensile strength of the high alloy heat-resistant steel attached to the cast test block Strength, through the experiment, the tensile strength value obtained by this method is compared with the actual value of the tensile strength detected by the universal tensile testing machine, and the purpose of evaluating the strength value of the casting through simple and easy hardness testing is fully achieved. Therefore, it can be used to guide actual production, process testing, and customer performance witness, which improves the manufacturing level of large heat-resistant steel castings and has strong practicability.

Description

technical field [0001] The invention belongs to the field of mechanical performance detection of large steel castings, and in particular relates to an evaluation method for the tensile strength of high-alloy heat-resistant steel. Background technique [0002] Hardness and tensile strength are the two most commonly used mechanical performance indicators in product inspection of mechanical parts. [0003] The strength performance determines the use value of the material to a large extent, and the tensile strength is often used as the main parameter to evaluate its load-bearing capacity in the design of mechanical parts. Tensile strength is the material strength performance index obtained by uniaxial tensile test. During the test, the material first produces elastic deformation, and after yielding, the stress exceeds the yield point to produce plastic deformation, and finally normal fracture occurs when the normal stress exceeds the breaking strength. ductile fracture. [000...

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Problems solved by technology

[0013] It can be seen from the above that because there are many types of metal materials, and the materials are formed in different states or subjected to different heat treatment states, the relationship between their strength and hardness is different, and there is no such thing as a high-alloy heat-resistant steel in the existing materials. In terms of strength and hardness conversion research, the conversion table provided by the national standard also lacks such conversion