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本文研究了高温热处理后00Cr18Ni5Mo3Si2双相不锈钢(18-5钢)的晶间腐蚀性能。由于高温敏化加热后水冷时,沿α/α晶界和α/γ相界析出M_(23)C_6型富铬碳化物,导致碳化物附近的贫铬区,使18-5钢在EPR法和T法中均产生晶间腐蚀。高温敏化加热后空冷时,M_(23)C_6型碳化物和大量羽毛状γ′相沿晶界析出,但经EPR法和T法检验,均无晶间腐蚀倾向。无论空冷或水冷,高温热处理得到粗大铁素体晶粒的18-5双相不锈钢,在T法试验后弯曲时,均发生脆性断裂。
In this paper, the intergranular corrosion behavior of 00Cr18Ni5Mo3Si2 duplex stainless steel (18-5 steel) after high temperature heat treatment was studied. As the high temperature sensitized heating water cooling, along the α / α grain boundary and α / γ phase boundary precipitation of M_ (23) C_6-type chromium-rich carbide, resulting in the vicinity of the chromium carbide poor, 18-5 steel in the EPR method And T method are intergranular corrosion. M_ (23) C_6 carbides and a large number of feathery γ ’phases are precipitated along the grain boundaries when air cooled with high temperature sensitizing heating, but there is no tendency of intergranular corrosion after EPR and T tests. Whether air-cooled or water-cooled, high-temperature heat treatment to obtain coarse ferrite grain 18-5 duplex stainless steel, T method test after bending, brittle fracture occurred.