Effect of Solute Copper on Hardness and Ductile-to-Brittle Transition in α-Iron
Effect of Solute Copper on Hardness and Ductile-to-Brittle Transition in α-Iron
复制标题
固溶铜对α-铁硬度和韧脆转变的影响
DOI：
10.2355/tetsutohagane1955.86.8_558
复制
发表时间：
2000
影响因子：
0.3
通讯作者：
S. Takaki
中科院分区：
文献类型：
--
作者：
J. Syarif;T. Hoshino;T. Tsuchiyama;S. Takaki
研究了Fe-（0-2）mass%Cu合金中溶质Cu对α-Fe的强化和韧脆转变的影响。Fe-Cu合金在固溶处理温度以下的水淬过程中发生大量铁素体相变。随着Cu含量的增加，块状铁素体晶粒细化，硬度提高。固溶硬化对强化的作用占主导地位，而块状铁素体晶粒的细化作用不大。夏比冲击试验表明，铜的加入大大降低了α-铁的DBT温度。低温脆化是由于形变孪晶在铁素体晶界处发生解理裂纹所致。固溶态的铜抑制了形变孪晶的形成，使DBT温度向低温方向移动。
Synopsis : Effects of solute Cu on strengthening and ductile-to-brittle transition (DBT) of a-iron have studied for Fe-(0-2)mass%Cu alloys. The Fe—Cu alloys exhibit massive ferritic transformation on water-quenching from solution treatment temperature. With increasing Cu content, the massive ferrite grains were refined and the hardness was raised. Effect of the solid solution hardening is predominant to the strengthening, but the refinement of massive ferrite grains does not affect so much. Charpy impact tests showed that Cu addition substantially lowers DBT temperature of a-iron. The embrittleness at low temperature was caused by the onset of cleavage cracks at ferrite grain boundaries where deformation twins impinged. Copper in solution suppresses the formation of deformation twins, and this results in the shift of DBT temperature to lower side.