Ambient and cryogenic S-N fatigue behavior of Fe15Mn steel and its weld

Abstract

The S-N fatigue behavior of Fe15Mn (Fe-0.7C-15Mn-2Al) austenitic steel, including base metal and butt-welded joint, was investigated at 298 K and 110 K, and the results were compared to those of STS304L (Fe-1Si-2Mn-20Cr-10Ni) counterparts. Both specimens showed improved resistance to S-N fatigue with decreasing temperature from 298 K to 110 K. The resistance to S-N fatigue of Fe15Mn steel was greater at 298 K, while it was lower at 110 K, than STS304L steel. Unlike STS304L, Fe15Mn steel did not show any notable transformation induced plasticity and twining-induced plasticity effect under fatigue loading at ambient and cryogenic temperatures. The S-N fatigue behavior of Fe15Mn steel was strongly dependent on tensile strength at both ambient and cryogenic temperatures. Similar S-N fatigue behavior was also observed for the butt-welded joints of Fe15Mn steel. The S-N fatigue behavior of Fe15Mn steel and its weld was discussed based on the fractographic and microscopic observations.

Critical assessment 19: Stacking fault energies of austenitic steels

“…Vitos et al 86 also collected the SFE values of Fe- (13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25) Cr- (13)(14)(15)(16))Ni (at.-%) steels measured using the TEM and the XRD from the literature, and compared them with the values calculated using ab initio simulation. They found that the addition of Cr to austenitic stainless steels lowers their SFE values.…”

“…The temperature as well as alloying elements is also an important factor for the SFE. Rémy et al 122 gave an overview of a temperature dependence of SFE, which was measured using the TEM, in Fe- (17)(18)(19)(20)Cr- (13)(14)(15)Ni and Fe-20Mn-4Cr-0.5C (wt-%) steels. They reported that the SFE value of Fe-Cr-Ni steels increased by approximately 0.1 mJ m −2 per K when the temperature rose from 300 to 400 K and that those of Fe-Mn-Cr-C steels were arisen by 0.06 mJ m −2 per K with increasing temperature from 300 to 390 K; these results stemmed from the improvement of γ stability with an increase in temperature.…”

“…[1][2][3][4][5][6][7][8][9][10][11] The strengthening mechanism of the fcc steels is strongly dependent upon the stacking fault energy (SFE) of γ austenite. 1,4,8,[10][11][12][13][14][15][16][17][18][19][20][21] It is known that whereas the mechanical stimulation of ε martensite is a dominant strengthening mechanism when the SFE value is less than approximately 20 mJ m −2 , TWIP begins to dominate as the SFE value ranges from 20 to 40 mJ m −2 . 1,2,8,9 For TWIP steels, the SFE influences a 'critical stress' for mechanical twinning, 13,[22][23][24][25][26] the twin fraction [27][28][29] and the twin thickness.…”

Hydrogen-Affected Tensile and Fatigue Properties of Ti-6Al-4V Sheets by Superplastic Forming

“…It has been well established that the resistance to HCF in some non-ferrous alloys is largely determined by tensile strength or yield strength [11,[30][31][32][33][34].…”

Fe‐Based Filler Material Forming Austenite‐Covered Packet Lath Martensite for Gas Tungsten Arc Welding of 9% Ni Steel

“…[2,3] Typically, steel composed of retained austenite with a face-centered cubic (FCC) crystal structure exhibits suitable tensile strength and toughness at room and cryogenic temperatures. [2][3][4][5][6][7] The presence of the FCC crystal structure is essential for achieving low-temperature toughness because of its superior slip system compared to that of other crystal structures, such as body-centered cubic (BCC) and hexagonal close-packed structures. [2][3][4] Furthermore, unlike BCC crystal structures, FCC crystal structures do not exhibit a ductile-brittle transition at low temperatures.…”