Določanje popustnih karakteristik orodnega jekla D2

zaključna naloga Univerzitetnega študijskega programa I. stopnje Strojništvo - Razvojno raziskovalni program

Jakob Jakše (Author), Roman Šturm (Mentor)

Abstract

Eksperimentalna raziskava zajema vpliv spreminjanja medija gašenja, temperatur popuščanja in števila ciklov popuščanja na orodno jeklo za delo v hladnem D2. Namen raziskave je bila ugotovitev optimalnih parametrov toplotne obdelave za dosego želene trdote materiala s hkratnim ozirom na nekatere ostale mehanske lastnosti jekla. V eksperimentalnem delu smo pripravili serijo vzorcev orodnega jekla D2, ki smo jih kalili z dvema različnima medijema gašenja in nato večkrat popuščali na različno visokih temperaturah. Po vsakem koraku toplotne obdelave smo vzorcem pomerili trdoto z metodo Rockwell C. Na koncu toplotne obdelave smo vzorcem izmerili tudi zaostale napetosti po metodi rentgenske difrakcije ter pod optičnim mikroskopom analizirali razlike v mikrostrukturi. Ugotovili smo, da je optimalna temperatura popuščanja 550 °C, saj trdota jekla pri popuščanju na višjih temperaturah pade, njegove mehanske lastnosti pa bodo pri nadaljnji uporabi do delovnih temperatur 550 °C odporne na spremembe.

Keywords

orodno jeklo D2;toplotna obdelava;kaljenje;popuščanje;trdota;zaostale napetosti;

Data

Language:	Slovenian
Year of publishing:	2024
Typology:	2.11 - Undergraduate Thesis
Organization:	UL FS - Faculty of Mechanical Engineering
Publisher:	[J. Jakše]
UDC:	620.17:621.78:621.785.796(043.2)
COBISS:	202427139
Views:	96
Downloads:	33
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Determining the tempering characteristics of D2 tool steel
Secondary abstract:	Experimental research contains the impact of changing the quenching medium, tempering temperatures and the number of tempering cycles on the tool steel D2. The purpose of this research was to determine the optimal parameters of heat treatment to achieve the desired hardness of the material with regard to some other mechanical properties of the steel. In the experimental part, we prepared a series of samples of tool steel D2, which were quenched with two different quenching media, and then tempered several times at different temperatures. After each heat treatment step, the hardness of the samples was measured using the Rockwell C method. At the end of the heat treatment, the samples’ internal residual stress levels were measured using the X-ray diffraction method and the differences in the microstructure were analysed under an optical microscope. We found that the optimal tempering temperature is 550 °C, as the hardness of the steel decreases during tempering at higher temperatures, and its mechanical properties will thus be resistant to changes during further use up to 550 °C.
Secondary keywords:	tool steel D2;heat treatment;hardening;tempering;hardness;internal residual stress;
Type (COBISS):	Final paper
Study programme:	0
Embargo end date (OpenAIRE):	1970-01-01
Thesis comment:	Univ. v Ljubljani, Fak. za strojništvo
Pages:	XI, 39 f.
ID:	24314261