1·The hardening gradient and the character of abrasion in hardening layer of hypoeutectoid steel with two kinds of matrixes that was treated by laser beam have been studied.
研究了两种基体的亚共析钢经激光处理后，其硬化层的硬度梯度及其磨损特性。
2·Both steel iron and cast iron have the structures of eutectoid, hypoeutectoid and hypereutectoid.