Sintered duplex stainless steels from premixes of 316L and 434L powders

Tribological study of hot pressed oxide dispersion strengthened 2205 DSS composite

“…Parameters such as temperature and pressure, particle size and shape, particle distribution, powder composition and grades have a great influence on the powder metallurgy processing and properties of the stainless steel (Zhoungchun, Takenobu, Keisuke & Tadasu, 2000;Sulima, Klimczyk & Hyjek, 2009;Campos, Bautista, Caceres, Abenojar & Torralba, 2003). The premixes of other existing stainless steels to form another type of stainless steel are also studied by Datta & Upadhyaya (2001). doi: 10.15174.au.2014.505 There is a great demand for a new material to be used in engineering applications.…”

Effect of ageing heat treatments on the microstructure and intergranular corrosion of powder metallurgy duplex stainless steels

“…Powder metallurgy (PM) technology offers an ability to produce a broader spectrum of alloy compositions with unique properties. However, the inherently residual open porosity and the problems arising from industrial sintering atmospheres [1,2] limit their corrosion resistance.…”

“…For PM duplex SS the chromium depletion process due to precipitation of secondary phases acts synergistically with interconnected pores and consequently lower corrosion resistance is achieved [1,2,10,11].…”

“…Corrosion behaviour of PM duplex SS obtained through mixed ferritic and austenitic powders has been studied by immersion test, [12,13] in the salt fog spray test [11] and preliminary electrochemical testing [1,2,[12][13][14]. Generally speaking, PM duplex SS obtained from mixing, show lower corrosion resistance but better pitting corrosion resistance than wrought duplex SS [12].…”

“…Duplex SS sintered in vacuum or in hydrogen are investigated in many works [2,11,13,[15][16][17][18] but little information is found about PM duplex SS sintered in nitrogen. The optimization of wrought and cast duplex SS has resulted in continuous material development related to their alloying, especially with nitrogen and the resulting mechanical, corrosion and wear properties as well as weldability [19][20][21][22].…”