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OALib Journal期刊
ISSN: 2333-9721
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基于热加工图的喷射成形含铌高速钢的热变形
Keywords: 金属材料喷射成形,高速钢,热变形,热加工图,铌
Abstract:
？结合以铌代替部分钒的合金化思路和用喷射成形快速凝固技术制备出新型m3:2高速钢,研究了合金在950-1150℃和0.001-10s-1条件下的热变形。根据实验得到的真应力-真应变曲线,基于动态材料模型(ddm)建立合金热加工图并结合动力学分析和组织观察,将加工图分为塑性失稳区(>1s-1)、低应变速率区(0.001s-1)、低变形温度区(<1000℃)和加工安全区,重点讨论了低应变速率区和低变形温度区内裂纹产生的机制,并由此确定了合金可进行热加工的区间为1050-1150℃,0.01-0.1s-1。为了得到晶粒细小、碳化物呈颗粒状且分布均匀的组织,优化后的热变形加工参数为1150℃,0.1s-1。喷射成形含铌m3:2高速钢经锻造和热处理后,其硬度和弯曲强度等性能优于同等成分的粉末冶金高速钢。
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