Toplotne lastnosti jekla 17-4 ph

Skok, Nik (author), Karpe, Blaž (mentor)

V diplomskem delu je opisan postopek merjenja toplotnih lastnosti nerjavečega jekla 17-4 ph (W.nr. 1.4542) z metodo tranzientnega toplotnega vira (TPS Hot disk ®). Vse meritve so bile izvedene po standardu ISO 22007-2. Obravnavali in izmerili smo toplotne lastnosti, kot so: toplotna prevodnost, temperaturna prevodnost in specifična toplota. Vključena so tudi pojasnila in podrobni opisi metode TPS ter kratki opisi nekaterih metod za merjenje toplotnih lastnosti. Meritve toplotnih lastnosti jekla 17-4 ph so bile opravljene z napravo tranzientnega planarnega toplotnega vira (TPS Hot Disk 2200) na Katedri za toplotno tehniko, Oddelka za materiale in metalurgijo, Naravoslovnotehniške fakultete, Univerze v Ljubljani. Izmerjene vrednosti toplotne prevodnosti jekla 17-4ph (žarjeno, valjano, ohlajano na zraku) pri sobni temperaturi se nahajajo v območju 12,90 ± 0,04 W/(m K), temperaturna prevodnost 3,7 ± 0,16 mm2/s in volumska specifična toplota 3,36 ± 0,02 MJ/(m3 K), kar je v skladu z natančnostjo in ponovljivostjo izbrane metode. Če dobljene podatke primerjamo s podatki iz tehničnih specifikacij jekla, lahko ugotovimo, da se izmerjene toplotne lastnosti nahajajo znotraj območja, ki ga navajajo proizvajalci. V delu so opisane tudi lastnosti martenzitnega nerjavnega jekla 17-4 ph.

• Language: Slovenian
• Keywords: Toplotne lastnosti, jeklo 17-4 ph, metoda TPS, Hot disk, standard ISO 22007
• Work type: High school thesis
• Typology: 2.11 - Undergraduate Thesis
• Organization: NTF - Faculty of Natural Sciences and Engineering
• Year: 2020
• PID: 20.500.12556/RUL-116719
• COBISS.SI-ID: 19017475
• Publication date in RUL: 05.06.2020

SKOK, Nik, 2020, Toplotne lastnosti jekla 17-4 ph [online]. Bachelor’s thesis. [Accessed 2 April 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=116719

Secondary language

• Language: English
• Title: Thermal properties of 17-4 ph steel

Abstract

The diploma thesis describes the process of measuring thermal properties of stainless steel 17 4 ph (W.nr. 1.4542) with the transient planar source method (Hot disk ®). All measurements were performed in accordance with the ISO 22007-2 standard. Thermal properties such as: thermal conductivity, thermal diffusivity and specific heat were considered and measured. Explanations and descriptions of the TPS method for measuring thermal properties are also included as well as a brief explanation of other methods for measuring thermal properties. Measurements were performed with the Hot Disk TPS 2200 instrument located in the laboratory of the Chair of Heat Engineering, Department of Materials and Metallurgy, Faculty of Natural Sciences and Engineering, University of Ljubljana. The measured thermal properties of 17-4ph steel (solution annealed, hot rolled, air cooled) at room temperature are: thermal conductivity 12,90 ± 0,04 W/(m K), thermal diffusivity 3,7 ± 0,16 mm2/s, and volumetric specific heat 3,36 ± 0,02 MJ/(m3 K) which corresponds to the accuracy of the method. If we compare the obtained results with the data from the technical specifications of 17-4 ph steel, we can conclude that the measured thermal properties are within the range stated by the manufacturers. The diploma thesis also generally describes the properties of 17-4 ph steel.

• Keywords: Thermal properties, steel 17-4 ph, TPS method, Hot Disk, standard ISO 22007