STUDI EKSPERIMENTAL PROSES HARDENABILITY BAJA AISI 4340 PADA TEMPERATUR 900 O C, 1100 O C, 1400 O C DITINJAU TERHADAP HASIL UJI JOMINY TEST JURUSAN TEKNIK MESIN UNIVERSITAS TUJUH BELAS AGUSTUS 1945 SURABAYA

Abstract

Experimental Study Process hardenability Steel Aisi 4340 At temperatures of 900
O
c, 1100
c Seen
On Test Results Jominy Test, this research aims to data requirements thesis Department of Mechanical Engineering
University August 17, 1945 Surabaya, Hardenability is the ability of the steel to be hardened to form martensite.
Hardenability describe it hardening (depth of hardening) obtained by hardening, usually expressed by a distance of
a point below the surface where the structure consists of 50% martensite (presumed that occurs when a martensitic
hardening as much as 50%). A steel is said to have a high hardenabiliti if it shows thick steel hardening (depth of
hardening) were large or may harden the entire cross-section of an object large enough. To measure hardenabiliti
on AISI 4340 steel by Jominy way. Testing hardenabiliti manner called Jominy end quench hardenability test
because the test specimen is used berbentu cylindrical trunk diameter of 1 "(25 mm) long 4" (100 mm) which is
cooled at one end. For this test use tool with a hole where the specimen is at its peak. Just below the specimen
contained a nozzle diameter of 1 "(12.5 mm) for spraying cooling water to the height emission-free 2.5" (65 mm).
Among the specimens with a nozzle mounted plate barrier that can be opened quickly shortly after the specimen is
placed in the holder hole. From the results of this test to obtain violence on AISI 4340 steel is higher than the
strength before doing the testing process.
The test rod is heated at tempratur austenisasi for 30-35 minutes. Furnace atmosphere should be kept neutral in
order to avoid the formation of slag and carburizing. After the testing process Jominy This test is continued
kesebuah Rockwell testing process and testing of microstructure (Metallography), to obtain a data for the
observation process.

Keywords: Process hardenability Steel Aisi 4340 Against Jominy Test Results Test