Preliminary Outcome on Grain refinement in Ferritic Stainless Steel Welds

2015 ◽  
Vol 4 (2) ◽  
pp. 13-13
Author(s):  
M.O.H. Amuda ◽  
E.T. Akinlabi ◽  
S. Mridha
Keyword(s):  
Stainless Steel ◽  
Grain Refinement ◽  
Ferritic Stainless Steel ◽  
Steel Welds

Grain Refinement in Medium Chromium Ferritic Stainless Steel Welds via Aluminum Powder Addition

2012 ◽  
Vol 445 ◽  
pp. 717-722 ◽  
Author(s):  
M.O.H. Amuda ◽  
S. Mridha
Keyword(s):  
Stainless Steel ◽  
Grain Refinement ◽  
Ferritic Stainless Steel ◽  
Aluminum Powder ◽  
Travel Speed ◽  
Energy Conditions ◽  
Melt Pool ◽  
Powder Addition ◽  
Process Factors ◽  
Steel Welds

Grain refinement in medium chromium ferritic stainless steel weld was attempted via elemental (aluminum) powder pre-placement technique prior to melting under a TIG torch. A Box-Behnken experimental design was adopted with current, travel speed and the amount of aluminum powder added as the process factors for producing weld pool. The resolidified weld tracks were characterized using microscopy, microhardness and mechanical testing. The degree of grain refinement achieved was evaluated using a scaling index known as Grain Refinement Index (GRI). The findings showed that the GRI is influenced by the concentration of the aluminum powder introduced into the melt pool. Furthermore, high GRI does not necessarily translate to better mechanical properties relative to the conventional weld. This suggests that the grain size effect might not be the only factor influencing the property of weld metal. However, weld track treated with 0.08mg/mm2 of aluminum powder exhibited about 20% improvement in properties relative to the conventional weld made under the same energy conditions.

Grain Refinement in Ferritic Stainless Steel Welds: The Journey so Far

2009 ◽  
Vol 83-86 ◽  
pp. 1165-1172 ◽  
Author(s):  
M.O.H. Amuda ◽  
S. Mridha
Keyword(s):  
Heat Transfer ◽  
Stainless Steel ◽  
Grain Refinement ◽  
Ferritic Stainless Steel ◽  
Weld Pool ◽  
Low Cost ◽  
Large Fraction ◽  
Welding Process ◽  
Superior Corrosion Resistance ◽  
Steel Welds

The ferritic stainless steel is a low cost alternative to the most often adopted austenitic stainless steel due to its higher strength, better ductility and superior corrosion resistance in caustic and chloride environments. However, the application of ferritic steel is limited because of poor ductility and notch impact toughness of its weld section with differential grain structures. Several techniques have been explored to control the grain features of the weld to minimize these problems. In the present effort, a review of these options in relation to the degree of grain refinement in ferritic stainless steel weld is conducted in order to have a better understanding about the grain refining phenomenon in the weld microstructure. So far, the most effective technique is found to be the pulse AC TIG welding which can produce weld with mechanical properties equivalent to 65% to those of the base metal. The refinement in this process occurred through dendrite fragmentation and grain detachment in the weld pool producing small-grained microstructures with a large fraction of equiaxed grains. However, in friction welding process where heat input and heat transfer are effectively controlled, the strength can be as high as 95% of the parent metal. This suggests that the total energy input for welding and heat transfer phenomenon mainly control the development of microstructural feature in the weld pool and hence the strength.

scholarly journals Grain refinement in additively manufactured ferritic stainless steel by in situ inoculation using pre-alloyed powder

2021 ◽  
Vol 194 ◽  
pp. 113690
Author(s):  
A. Durga ◽  
Niklas Holländer Pettersson ◽  
Sri Bala Aditya Malladi ◽  
Zhuoer Chen ◽  
Sheng Guo ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Grain Refinement ◽  
Ferritic Stainless Steel ◽  
Alloyed Powder

PS28 Effect of Weld Metal on Fatigue Strength in Type 430 Ferritic Stainless Steel Welds

2013 ◽  
Vol 2013 (0) ◽  
pp. _PS28-1_-_PS28-3_
Author(s):  
Kohei TAKINO ◽  
Masayuki AKITA ◽  
Yoshihiko UEMATSU ◽  
Toshifumi KAKIUCHI ◽  
Masaki NAKAJIMA ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Fatigue Strength ◽  
Weld Metal ◽  
Ferritic Stainless Steel ◽  
Steel Welds

scholarly journals Microstructure and mechanical properties of AISI 439 ferritic stainless steel welds without filler metal

2019 ◽  
Vol 29 ◽  
pp. 1-12
Author(s):  
Juan Manuel Salgado López ◽  
Marc Preud homme ◽  
Francisco Lopez Monroy ◽  
Jose Luis Ojeda Elizarráraz ◽  
Arturo Toscano Giles
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Tensile Test ◽  
Grain Growth ◽  
Ferritic Stainless Steel ◽  
Filler Metal ◽  
Testing Machine ◽  
Thin Plates ◽  
Technical Literature ◽  
Steel Welds

In literature, it has been reported that a current intensity lower than 120 A leads to a microstructure without grain growth in the heat affected zone (HAZ) of ferritic stainless steel welds. Nevertheless, in technical literature there is little information about the reduction in mechanical properties of ferritic stainless steel welds without filler metal due to grain growth in the HAZ. In this work, thin plates of ferritic stainless 439 steel were welded using pulse current gas tungsten arc welding (P-GTAW) without filler metal. The microstructures in the HAZ were analyzed and the mechanical properties on the welded joint were found by tensile test. This was carried out by cutting samples for the tensile test from the weldments and then tested in a universal testing machine. The fracture surface were observed using scanning electron microscope.

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