발전터빈 다이아프램 내외부링 링밀 소재 SUS410J1의 열처리 조건에 따른 특성 연구

다국어 초록 (Multilingual Abstract)

This paper is a study to evaluate the mechanical properties of ingot-cast alloy materials used as diaphragm materials for turbine components of power generation steam turbines. In this paper, the mechanical properties were confirmed using spark atomic emission spectroscopy, a universal testing machine, a Charpy impact tester, and a Brinell hardness tester. The material is a material (SUS410J1) manufactured by the ingot casting method according to the standards of Mitsubishi Hitachi Power Systems Co., Ltd. (e.g., 80G-10036). The mechanical properties were compared according to the tempering temperature. The JIS code was selected to identify the material properties by the inner surface, outer surface, and mean radius position of the material. According to the test results, the hardness was high in the order of 680℃ > 710℃ > 740℃. At room temperature, the tensile strength was high in the order of 680℃ > 710℃ > 740℃, the yield strength was high in the order of 680℃ > 710℃ > 740℃, the elongation was high in the order of 740℃ > 710℃ > 680℃, and the area shrinkage was high in the order of 740℃ > 710℃ > 680℃. In addition, when the inner diameter and outer diameter were compared, the inner diameter was higher than the outer diameter. The tempering temperature that satisfied the specifications for both the inner diameter and the outer diameter was 740℃.

목차 (Table of Contents)

• 제1장 서론 1
• 1.1 연구 배경 1
• 1.2 연구 목적 2
• 제2장 이론적 배경 3
• 2.1 증기터빈의 개요 3
• 2.1.1 증기터빈의 분류 4
• 2.1.2 증기터빈의 구조 5
• 2.1.3 증기터빈의 주요부품 6
• 2.2 연구 대상품 7
• 제3장 시험방법 10
• 3.1 시험 소재의 금속학적 특성 분석 10
• 3.1.1 Code 및 추가 요건에 대한 시험품 주조 10
• 3.1.2 Code 및 추가 요건에 대한 열처리 공정 18
• 3.1.3 시험 공정 및 장비 25
• 제4장 시험결과 및 고찰 35
• 4.1 시험품의 금속학적 특성 분석 35
• 4.1.1 기계적 특성 분석 35
• 제5장 결론 51
• 참고문헌 53