Effects of quenching and tempering on the microstructure and bake hardening behavior of ferrite and dual phase steels
Effects of quenching and tempering on the microstructure and bake hardening behavior of ferrite and dual phase steels
复制标题
DOI：
10.1016/j.msea.2014.06.100
复制
发表时间：
2014-09
期刊：
影响因子：
6.4
通讯作者：
C. Kuang;J. Li;Shen‐gen Zhang;J. Wang;H. Liu;A. Volinsky
中科院分区：
文献类型：
--
作者：
C. Kuang;J. Li;Shen‐gen Zhang;J. Wang;H. Liu;A. Volinsky
研究了淬火和回火对铁素体和双相钢组织演变和烘烤硬化行为的影响。将C-Mn钢加热至均热温度，在水中淬火，然后在100-500 °C范围内回火。在预应变之后，进行烘烤处理（180 °C持续20分钟）以测量BH值。结果表明，淬火温度的升高降低了BH值。在800 °C和900 °C退火的钢，当淬火温度超过670 °C和710 ° C时，BH值变为负值。回火过程中铁素体时效和马氏体回火对烘烤硬化行为起着关键作用。在本研究中，上述钢的回火过程中确定了三个阶段：（1）铁素体中残余应力的释放;（2）铁素体和马氏体中碳化物的析出;（3）铁素体中碳化物的溶解。铁素体钢和双相钢的BH值随回火温度的变化都比较复杂。当回火温度从25 °C升高到500 °C时，BH值先降低后略有升高。
The effects of quenching and tempering on the microstructure evolution and bake hardening (BH) behavior of both ferrite and dual phase steels were investigated. The C–Mn steels were heated to the soaking temperature, quenched in water and then tempered in the 100–500 °C range. After pre-straining, the baking treatment (180 °C for 20 min) was carried out to measure the BH values. It was found that increased quenching temperature reduced the BH value. Furthermore, the BH value turned to be negative when the quenching temperature exceeded 670 °C and 710 °C for the steels annealed at 800 °C and 900 °C, respectively. The ferrite aging and the martensite tempering played key roles in the bake hardening behavior during the tempering process. In the present study, three stages were identified during tempering of the above steels: (1) the relief of residual stresses in the ferrite; (2) the precipitation of carbides in both ferrite and martensite; (3) the dissolution of carbides in the ferrite. The BH values of both ferrite and dual phase steels had a complex variation with the tempering temperature. After an apparent increment, the BH value reduced, and then was slightly enhanced when the tempering temperature increased from 25 °C to 500 °C.