Method for estimating plane strain breaking tenacity KIC of high-strength steel
A technology of fracture toughness and plane strain, applied in the direction of strength characteristics, measuring devices, instruments, etc., can solve complex, time-consuming and difficult to test problems, and achieve the effect of saving experimental time and cost
Inactive Publication Date: 2018-12-07
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Benefits of technology
Inventors have developed methods that allow researchers to easily determine if certain types of metal work will fail or crack under specific conditions without having significant effort. These techniques include studying how well these metals resist deformation caused during their manufacturings process. By comparing the properties of each type of alloy used, they may identify areas where failure occurs more likely than others.
Problems solved by technology
Technological Problem addressed in this patents discusses the importance of studying various aspects related to fractures during stress corrosion processes. These include factors like tensility, brittleness, featherthritis tendency, and thermal shock response behavior. While current methods involve complex analysis techniques, none offer precise numerical relationships between specific measures taken separately due to their complexity and lack of mathematical foundation. There remains room for improvement through more efficient ways to evaluate fracturing resistance while maintaining accuracy over large samples.
Method used
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Embodiment 1
[0054] This embodiment uses impact toughness to predict the fracture toughness of several high-strength steels, including AISI 4340 steel, 18Ni maraging steel, 51CrV4, AISI 4147 and other high-strength steels. The specific steps are as follows:
[0055] Step 1: Perform a tensile test to obtain the yield strength σ of the high-strength steel y ;
[0056] Step 2: Carry out the Charpy impact test at room temperature to obtain the impact toughness α k ;
[0057] Step 3: Calculate K by formula (1) IC , the estimated value and the experimental value are shown in Figure (7), the error is within 10%, and the two coincide.
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Abstract
The invention discloses a method for estimating plane strain breaking tenacity KIC of high-strength steel, belonging to the technical field of the breaking tenacity of metal materials. The method comprises the following three steps: measuring yield strength sigmay of the high-strength steel by virtue of a tensile experiment; measuring the impact tenacity alphak of the material by virtue of a room-temperature Charpy impact test; and accurately calculating KIC according to an intrinsic relation between the impact tenacity and the breaking tenacity of the high-strength steel. According to the method, the breaking tenacity of the high-strength steel can be simply, rapidly and conveniently estimated, so that the test time and cost are greatly saved, and the method has important reference significance to the material in which KIC cannot be measured in a breaking tenacity standard test. By virtue of the rapid estimation of the breaking tenacity, accurate reference is provided for the materialselection in engineering application, and particularly reliable performance index is provided for the damage tolerance design of high-strength steel structural components such as aerospace and petroleum transportation pipelines and nuclear power plant pressure containers.
Description
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