摘要
本文采用慢应变速率的试验方法(SSRT)研究了3种夹杂物分布状态不同的低合金钢(16MnR,A48CPR,16MnRE),在模拟Bayer法生产氧化铝条件下的高温碱脆行为。结果表明,3种低合金钢在260℃苛性偏铝酸钠溶液中均有碱脆敏感性。沿轧向分布的条状MnS夹杂使16MnR钢横向抗碱脆性能明显低于其纵向抗碱脆性能。钢中加入稀土元素可使夹杂物呈球状、弥散分布,降低材料各向异性程度,从而提高材料抗高温碱脆能力。分析表明,夹夹物对低合金钢碱脆性能的影响,受裂纹尖端塑性区单位体积中夹杂物在垂直于受力方向平面上的投影面积控制。
Stress corrosion cracking(SCC) behavior of three kinds of low alloy steels in high temperature(260℃, 280℃) caustic aluminate solutions was studied by slow strain rate tests (SSRT). The results indicated that all of these steels showed the susceptibility to caustic SCC. Stringered sulfide inclusions severely and anisotropically affected the caustic SCC of 16MnR steel. The inclusions in the rare-earth-treated steel were predominantly globular rare-earth-sulfides or oxysulfides, therefore the transversal property of 16MnR could be improved. The effect of inclusions on SCC behavior correlated with the projected area of inclusions per unit volume in plastic zone at the crack tip, Av, on the plane perpendicular to the tensile direction. The susceptibility to SCC increased with increasing Av.
出处
《腐蚀科学与防护技术》
CAS
CSCD
1992年第4期283-288,共6页
Corrosion Science and Protection Technology
关键词
低合金钢
高温
碱液
碱脆
low alloy steel
caustic SCC
high temperature Bayer solution
Slow strain rate test
