Vroča preoblikovalnost nerjavnega jekla AISI 321H

diplomsko delo

Noel Gregori (Author), David Bombač (Mentor), Boštjan Bradaškja (Co-mentor)

Abstract

Diplomska naloga ''Vroča preoblikovalnost nerjavnega jekla AISI 321H'' je bila izvedena z namenom določitve preoblikovalnosti jekla AISI 321H ter primerjave simulacije valjanja plošče na termomehanskem simulatorju metalurških stanj Gleeble 1500D in industrijsko valjane plošče v podjetju SIJ Acroni d.o.o. Jeklo AISI 321H je s titanom stabilizirano nerjavno jeklo. Preoblikovalnost se je določalo prek rezultatov enostopenjskih tlačnih preizkusov na termomehanskem simulatorju metalurških stanj Gleeble 1500D in enačbe za matematični opis preoblikovalnosti po Hansel-Spittelu. V ta namen je bilo izvedenih 21 tlačnih preizkusov. Preizkusi so potekali pri temperaturah 1250, 1200, 1150, 1100, 1050, 1000 in 950 °C ter pri hitrosti deformacije 10, 1 in 0,1 s-1. Pri tem se je tudi opisovalo proces dinamične rekristalizacije v tlačnih preizkušancih. Krivulje, izrisane po Hansel-Spittelu, se je primerjalo z eksperimentalnimi krivuljami enostopenjskih tlačnih preizkusov. Primerjava med simulacijo valjanja plošče in industrijsko valjano ploščo se je izvedlo na površini, četrtini in sredini plošče. Termomehanski pogoji simulacije so bili določeni iz parametrov valjanja preiskovane industrijsko valjane plošče. Primerjalo se je porazdelitev velikosti kristalnih zrn. Primerjalo se je tudi delež ?-ferita simulirane in industrijsko valjane plošče na površini, četrtini in sredini plošče. Dodatno se je izvedla DTA analiza in izrisal fazni diagram v programu ThermoCalc. Fazni diagram se je primerjalo z realno mikrostrukturo.

Keywords

nerjavno jeklo;AISI 321H;rekristalizacija;preoblikovalnost;valjanje;DTA;

Data

Language:	Slovenian
Year of publishing:	2020
Typology:	2.11 - Undergraduate Thesis
Organization:	UL NTF - Faculty of Natural Sciences and Engineering
Publisher:	[N. Gregori]
UDC:	669
COBISS:	34578179
Views:	452
Downloads:	112
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	hot workability of AISI 321H stainless steel
Secondary abstract:	Diploma thesis ''Hot workability of AISI 321H stainless steel'' was performed to determine the workability of AISI 321H steel and compare the simulation of plate rolling on a thermomechanical simulator of metallurgical states Gleeble 1500D and industrial rolled plates in the company SIJ Acroni d.o.o. AISI 321H steel is titanium stabilized stainless steel. Workability was determined through the results of one-step pressure tests on a Gleeble 1500D thermomechanical metallurgical state simulator and the Hansel-Spittel equation for a mathematical description of workability. For this purpose, 21 pressure tests were conducted. The tests were performed at temperatures of 1250, 1200, 1150, 1100, 1050, 1000 and 950 ° C and strain rates of 10, 1 and 0.1 s-1. The process of dynamic recrystallization in pressure specimens was also explained. The curves plotted according to Hansel-Spittel were compared with the experimental curves of one-step pressure tests. The comparison between the plate rolling simulation and the industrial rolled plate was performed on the surface, quarter and middle of the plate. The thermomechanical conditions of the simulation were determined from the rolling parameters of the investigated industrially rolled plate. The crystal grain size distribution was compared. The proportion of δ-ferrite of the simulated and industrially rolled plate on the surface, quarter and middle of the plate was also analysed. Additionally, DTA analysis was performed and a phase diagram was drafted in ThermoCalc. The phase diagram was compared with the real microstructure.
Secondary keywords:	stainless steel;AISI 321H;recrystallization;deformability;rolling;DTA;
Type (COBISS):	Bachelor thesis/paper
Study programme:	0
Embargo end date (OpenAIRE):	1970-01-01
Thesis comment:	Univ. v Ljubljani, Naravoslovnotehniška fak., Oddelek za materiale in metalurgijo
Pages:	XI, 48 str.
ID:	12048501