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利用热拉伸模拟方法研究了稀土对22Cr型双相不锈钢高温塑性的影响,并结合微观结构分析讨论了稀土的作用机制。结果表明:含量为0.042%的稀土可改善试验钢的高温塑性,扩大热加工安全区间近90℃。一方面,稀土使700~800℃范围的塑性低凹区基本消除,断口韧窝大且深并少见解理平台,这与其可在一定程度上抑制有害相σ相在δ/γ相界处形核有关;另一方面,稀土可改善两相的分布和形态,减少硬相奥氏体的尖角,从而抑制高温区塑性的迅速降低。
The influence of rare earth on the high temperature plasticity of 22Cr duplex stainless steel was studied by the hot tensile simulation method. The mechanism of rare earths was discussed with the microstructure analysis. The results show that the rare earth with the content of 0.042% can improve the high temperature plasticity of the test steel and expand the thermal processing safety zone nearly 90 ℃. On the one hand, rare earth makes plastic ductile area in the range of 700 ~ 800 ℃ to be basically eliminated, and large and deep cleavage dimples are rare and cleverest and rare cleavage platforms, which can restrain the phase of δ phase from being deformed to a certain extent On the other hand, rare earth can improve the distribution and morphology of the two phases, reduce the sharp austenite hardness, thereby inhibiting the rapid reduction of plasticity in high temperature.