采用低碳低合金的成分设计开发了一种新型的膨胀管用钢.经优化的(α+γ)两相区退火工艺处理后,钢材呈现出强度高、延伸性能好、加工硬化能力强、冲击韧性以及高温力学性能优良等特点.常温条件下,该膨胀管材料的抗拉强度超过了700 MPa,伸长率超过了40％,强塑积达到了30 GPa ·％,半厚冲击韧性超过了50J;300℃高温条件下,该类钢仍具有620 MPa以上的抗拉强度,40％以上的伸长率以及25 GPa·％以上的强塑积.采用SEM和XRD对材料的微观组织进行了表征,该类钢具有马氏体+残余奥氏体+铁素体的多相组织结构形貌.由于弥散分布的小尺寸残余奥氏体在形变过程中的TRIP效应,使得该类钢种在拉伸过程中获得了持续加工硬化的能力,从而获得了强度与塑性的优良结合.
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