Phase transformations in cold-rolled (CR) 304L austenitic stainless steel were studied using different techniques, including dilatometry, X-ray diffraction and scanning electron microscopy. During continuous annealing, the dilatometric measurements indicated that the evolution of the deformed microstructures led to an important anomaly constituted of two contractions. Quantitative processing of the X-ray diffraction results allowed the determination of the temperature-dependence of α′-martensite and austenite (γ), phase fractions, dislocations density and lattice strains on heating to 900°C. It is demonstrated that the first contraction is due to the recovery of α′- and γ-phases. In this temperature range, it is suggested that the recovery in CR γ has caused the growth of surrounding α′ particles which competes with the reversion of the smallest α′ particles. The second contraction, on the other hand, has been attributed to the α′ reversion and recrystallization in CR γ regions.

使用不同的技术（包括膨胀测定法、X 射线衍射和扫描电子显微镜）研究冷轧 (CR) 304L 奥氏体不锈钢的相变。在连续退火过程中，膨胀测量表明，变形微观结构的演变导致了由两次收缩组成的重要异常现象。 X 射线衍射结果的定量处理可以确定 α'-马氏体和奥氏体 (γ) 的温度依赖性、相分数、位错密度和加热至 900°C 时的晶格应变。结果表明，第一次收缩是由于α'相和γ相的恢复所致。在此温度范围内，表明 CR γ 的恢复导致周围 α' 颗粒的生长，这与最小 α' 颗粒的回复竞争。另一方面，第二次收缩归因于 CR γ 区域的 α' 回复和再结晶。