In box annealing a ferrous alloy, the charge is usually heated slowly to a temperature below the transformation range, but sometimes above or within it, and is then cooled slowly.

将一种金属或合金放在一个密闭容器中对其退火。在对某一铁基合金进行闭箱退火时，通常将装料缓慢加热到低于(但有时高于或位于)转换温度范围的某一温度，然后缓慢冷却。

youdao

Experimental results show that the composition ratio making Angle of phase transformation range become small can also increase the thermal analysis accuracy of cast iron chemical composition.

实验结果表明，能使相变段倾角最小的成分配比，也能提高对铸铁成分的热分析检测精度。

youdao

The tundra transformation took place in a pristine stretch between the Brooks Range and the Arctic coast, marked by few human or natural disturbances.

CNN: Shrub census shows Alaskan Arctic losing its cool

Unfortunately, he completed the transformation just as the telecoms boom was coming to an end, leaving Marconi with hefty debts and a range of overpriced assets whose value was steadily dwindling.

BBC: End of the line for Marconi shares