本文選題：稀土　切入點：低碳高鈮鋼　出處：《稀土》2015年01期

【摘要】：利用L78 RITA熱膨脹相變儀研究了不同冷速下稀土對低碳高鈮鋼相變行為的影響,并結(jié)合金相法繪制了加稀土和未加稀土兩種成分試驗鋼的連續(xù)冷卻相變曲線,分析了稀土對連續(xù)冷卻組織的影響規(guī)律。試驗結(jié)果表明,稀土加入低碳高鈮鋼后使連續(xù)冷卻相變曲線向右移動,在相同冷速下顯著降低了奧氏體向鐵素體轉(zhuǎn)變的開始溫度,并且隨著冷速的增加使降低程度增大。冷速從0.1℃/s增加到15℃/s時,加稀土的低碳高鈮相變開始溫度點下降了90℃,而未加稀土的下降了52℃;另一方面,稀土對低碳高鈮鋼在0.1℃/s到1℃/s冷速下的組織有較大影響,促進(jìn)了針狀鐵素體的轉(zhuǎn)變,并能在冷速增至5℃/s后使其更易獲得板條狀貝氏體組織。
[Abstract]:The effect of rare earth on the phase transformation behavior of low carbon high niobium steel at different cooling rates was studied by L78 RITA thermal expansion phase transformation instrument. The continuous cooling phase transformation curves of the steel with and without rare earths were drawn by metallographic method. The effect of rare earth on the structure of continuous cooling is analyzed. The experimental results show that the phase transformation curve of continuous cooling moves to the right after adding rare earth to low carbon high niobium steel, and the starting temperature of austenite to ferrite transition is significantly reduced at the same cooling rate. When the cooling rate increased from 0.1 鈩，

本文編號：1656207