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OALib Journal期刊
ISSN: 2333-9721
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含p高强if钢的高温力学性能
Keywords: 金属材料,高温力学性能,高温拉伸,含p高强if钢,thermo-calc,相变
Abstract:
？使用gleeble3500热模拟试验机测定零塑性温度(zdt)、零强度温度(zst)及最大抗拉强度随温度的变化,用扫描电镜观察分析不同拉伸温度下的断口形貌,使用thermo-calc软件计算其冷却过程中的相变及析出相,研究了含p高强if钢的高温力学性能。结果表明,该钢种的zdt和zst分别为1420℃和1445℃,第ⅰ脆性区间为1400℃-熔点,不存在第ⅲ脆性区间,铸坯表面裂纹不是在矫直过程中形成的;铸坯的最大抗拉强度随着拉伸温度的升高而降低,在1300℃以上最大抗拉强度均低于5.3mpa;高强if钢连铸坯冷却至500℃-200℃时析出大量fe3p,可能导致铸坯冷脆开裂。采用热装工艺,可以降低高强if钢铸坯表面横裂纹出现的机率。
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