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摘要：
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通过热模拟试验,进行了Mn18Cr18高氮钢的高温热塑性的研究,并对该钢种进行了热锻、热轧试验。结果表明:Mn18Cr18高氮钢的高温热塑性呈"V"字型变化,在1000~1100℃时塑性较差,面缩率仅为20%~30%,在此温度区间进行锻造冲孔时,冲口开裂;在1150~1200℃塑性最好,面缩率可达60%~70%,且变形抵抗较低,是最佳热加工温度区间。按5∶1比例制得的小型护环锻件,力学性能符合JB/T 7030-2002的要求。由于锻件属于多向锻造成形,因此塑性指标优于轧板。
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The hot plasticity of Mn18Cr18 high nitrogen steel was studied by thermal simulated test,and the hot forging and hot rolling tests of the steel were carried out subsequently.The results show that the hot plasticity of Mn18Cr18 high nitrogen steel varies with a "V" shape.It exhibits a dip plasticity value with φ=20%~30% when the deformation temperature is between 1000 and 1100 ℃,and the pieces crack during the forging punching tests in this temperature region.In the contrast,the steel exhibits a peak plasticity value with φ=60%~70% between 1150 and 1200 ℃,in addition,low deformation resistance can be obtained in this temperature region.Mechanical properties of the small retaining ring forging scaled down in 5∶1 was complied with the standard of JB/T 7030-2002.The ductility of the forgings was much better than the plate for the multiple forging process.
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基金项目：
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山西省自然科学基金资助项目(2008011047)
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作者简介：
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参考文献：
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[1]周维智,孙晓洁,许国涛.Mn18Cr18N钢护环生产工艺研究概况[J].大型铸锻件,2001,(1):52-54.
[2]陈玉明,周维志,宋雷钧,等.汽轮发电机组无磁性护环锻件材料的演变过程和研究概况[J].大型铸锻件,2002,(3):48-52.
[3]武建国,郭会光,刘建生.Mn18Cr18N护环钢热变形特性的试验研究[J].大型铸锻件,2004,(3):1-4.
[4]陈慧琴,刘建生,郭会光.氮对Mn18Cr18N护环钢高温力学性能的影响[J].特殊钢,2005,26(6):20-22.
[5]侯彦芬,冯万里,刘瑞堂.护环钢50Mn18Cr4沿晶断裂分析及其对晶界损伤本质的探讨[J].哈尔滨工程大学学报,2006,27(5):752-756.
[6]安红萍,刘建生,杨超操,等.Mn18Cr18N钢护环的包套冲挤成形数值模拟与试验研究[J].锻压技术,2006,31(6):127-130.
[7]JB/T 7030-2002,300 MN-600 MW汽轮发电机无磁性护环锻件,技术条件[S].
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