The .DELTA. to .GAMMA. Transition in Fe-Cr-Ni Alloys during Laser Treatment.

Fukumoto, Shigeo; Kurz, W.

doi:10.2355/isijinternational.37.677

Cited by 64 publications

(30 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Microstructural transition was evaluated by changing the composition over the length of the dissimilar alloy weld 17,19) as shown in Fig. 2.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…15) Moreover, the microstructural transition between d and g during laser experiments has been evaluated. 17) It was shown that the transition from d to g was controlled by the dendrite growth kinetics (i.e., no nucleation barrier exists) and that this transition could be predicted by theory. To the contrary, the reverse transition from g to d was inferred to be controlled by the nucleation of ferrite at the growing g-dendrite front.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Crystallographic Relationships between .DELTA.-Ferrite and .GAMMA.-Austenite during Unidirectional Solidification of Fe-Cr-Ni Alloys.

et al. 2000

Self Cite

View full text Add to dashboard Cite

The crystallographic orientation relationships between d-ferrite and g-austenite during unidirectional solidification of Fe-Cr-Ni alloys have been evaluated with EBSPs (Electron Back Scattering Patterns). The preferred orientation relationship between d and g agrees with the Kurdjumov-Sachs (K-S) relationship in both rod and lamellar eutectic structures obtained by Bridgman experiments. It is thought that the preferred relationship is developed by nucleation of secondary phase. The orientation relationship between primary gdendrites and primary d-dendrites during dissimilar alloy welding (primary g to d-dendrites) by a laser experiment also agrees with the K-S relationship. The transition from primary g to d-dendrites is thought to be controlled by heterogeneous nucleation of ferrite at the growing g-dendrite front. It is suggested that the nucleation also plays an important role in the microstructure formation.

show abstract

“…Microstructural transition was evaluated by changing the composition over the length of the dissimilar alloy weld 17,19) as shown in Fig. 2.…”

Section: Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Crystallographic Relationships between .DELTA.-Ferrite and .GAMMA.-Austenite during Unidirectional Solidification of Fe-Cr-Ni Alloys.

et al. 2000

Self Cite

View full text Add to dashboard Cite

show abstract

“…Fukumoto and Kurz extended the binary model for dendrite solidification to the multicomponent Fe-Cr-Ni-C system by coupling the calculations with computational thermodynamics. [52][53][54] We have adopted the same approach here and have applied it to the Fe-C-Al-Mn system. The results [see Fig.…”

mentioning

confidence: 99%

Inclusion Formation and Microstructure Evolution in Low Alloy Steel Welds.

Babu

David

2002

ISIJ International

View full text Add to dashboard Cite

The paper presents an overview of research performed at Oak Ridge National Laboratory on inclusion-formation, weld-solidification, and solid-state transformations in low-alloy steel welds. The competition between oxide and nitride formation in Fe-C-Al-Mn self-shielded flux-cored arc steel welds was predicted using computational thermodynamics. Nonequilibrium austenite phase selection was monitored in a Fe-CAl-Mn weld using an in situ time-resolved X-ray diffraction technique. The competition between acicular ferrite and bainite formation from austenite was evaluated in Fe-C-Mn steel welds containing small amounts of titanium.KEY WORDS: steel welds; inclusion formation; weld solidification; nonequilibrium phase transformations; bainite; acicular ferrite.

show abstract

“…The Kurz -Giovanola -Trivedi (KGT) model is known to be applicable for such rapid solidification process as the transition of the primary phase on solidification might occur. Recently, the modified KGT model which is extended to alloys with multicomponents has been developed [7,8]. The modified KGT model was used for the analysis on the transition of solidification mode in the weld metal of stainless steels.…”

Section: Theoretical Model and Calculationsmentioning

confidence: 99%

Hot cracking susceptibility in laser weld metal of high nitrogen stainless steels

Nishimoto

Mori

2004

Science and Technology of Advanced Materials

View full text Add to dashboard Cite

High nitrogen stainless steels are used as structural materials required to possess high strength and fracture toughness at low temperatures. The solidification mode in weld metals of stainless steels is generally designed to be the primary ferrite solidification mode to prevent hot cracking. The weld metals in some high nitrogen stainless steels, however, exhibit the primary austenite solidification mode because of an austenitizing effect of nitrogen, which enhances hot cracking susceptibility. In addition, laser welding provides the primary austenite solidification mode in weld metals of stainless steels due to the high solidification rate. Therefore, the laser weld metal of high nitrogen stainless steels likely occurs hot cracking.This study was conducted to make clear an effect of nitrogen and the solidification rate on hot cracking susceptibility in the laser weld metals of type 304 stainless steels varied with nitrogen content. The hot cracking susceptibility was examined by the preloading tensile strain (PLTS) cracking test. The PLTS test results showed that hot cracking susceptibility was remarkably increased with increase in the solidification rate and the nitrogen content. On the other hand, the solidification mode in the weld metal was changed from the primary ferrite to the primary austenite, as the solidification rate was raised. The primary austenite solidification mode was also observed in the weld metals with higher nitrogen content at lower solidification rate conditions. The experimental results indicated that the increase in hot cracking susceptibility is in agreement with the transition of solidification mode from the primary ferrite to the primary austenite in the weld metal. The transition of solidification mode in the weld metals of high nitrogen stainless steels could be predicted by the calculation using the modified Kurz -Giovanola-Trivedi model considering the effect of nitrogen. q

show abstract

The .DELTA. to .GAMMA. Transition in Fe-Cr-Ni Alloys during Laser Treatment.

Abstract: Lausanne. Switzerland. Laser

Cited by 64 publications

References 0 publications

Crystallographic Relationships between .DELTA.-Ferrite and .GAMMA.-Austenite during Unidirectional Solidification of Fe-Cr-Ni Alloys.

Crystallographic Relationships between .DELTA.-Ferrite and .GAMMA.-Austenite during Unidirectional Solidification of Fe-Cr-Ni Alloys.

Inclusion Formation and Microstructure Evolution in Low Alloy Steel Welds.

Hot cracking susceptibility in laser weld metal of high nitrogen stainless steels

Contact Info

Product

Resources

About