High-temperature Microstructure and Mechanical Performance of As-cast 2205 Duplex Stainless Steel
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摘要: 对2205双相不锈钢连铸坯进行高温短时拉伸试验,分析了抗拉强度、断面收缩率随温度的变化情况。观察了试验温度为1 300、1 050、950、850℃下试样的高温组织及断口形貌。结果表明,在1 150~1 350℃温度范围内,双相不锈钢试样具有很好的塑性;在1 000~1 100℃时,较高的应变速率抑制了软化作用的进行,使双相不锈钢出现第Ⅱ脆性温度区,同时试样中存在的疏松和细小析出物进一步加剧了裂纹的发展。第Ⅲ脆性区产生的原因是由于在奥氏体晶界上析出了氮化物、碳氮化物等细小析出物造成晶界脆化。Abstract: High-temperature short-time tensile test of as-cast 2205 duplex stainless steel was performed and the variation of tensile strength and percentage reduction in area of the specimen at different temperatures was analyzed.The high-temperature microstructures and fracture morphologies were observed at 1 300 ℃,1 050 ℃,950 ℃ and 850 ℃.The test results showed that duplex stainless steel exhibited good plasticity at 1 150~1 350 ℃.Softening was inhibited due to high strain rate at 1 000~1 100 ℃,resulting in a brittleness temperature range Ⅱ present in the duplex stainless steel.In addition,crack propagated further due to loose and fine precipitation of the specimen.Presence of brittleness temperature range Ⅲ was the result of grain boundary embrittlement mainly caused by the nitride and carbonitride etc.precipitated at austenitic grain boundaries.
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